Barrett Business Services (BBSI) 10-Q1 Nov 232023 Q3 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2023	Oct. 18, 2023
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Trading Symbol	BBSI
Entity Registrant Name	BARRETT BUSINESS SERVICES, INC.
Entity Central Index Key	0000902791
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		6,616,653
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, Par Value $0.01 Per Share
Security Exchange Name	NASDAQ
Entity Incorporation, State or Country Code	MD
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	0-21886
Entity Tax Identification Number	52-0812977
Entity Address, Address Line One	8100 NE Parkway Drive
Entity Address, Address Line Two	Suite 200
Entity Address, City or Town	Vancouver
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	98662
City Area Code	360
Local Phone Number	828-0700

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 41,579	$ 91,423
Investments	87,653	68,325
Trade accounts receivable, net	205,217	163,838
Prepaid expenses and other	17,136	19,787
Restricted cash and investments	75,876	110,989
Total current assets	427,461	454,362
Property, equipment and software, net	48,679	45,954
Operating lease right-of-use assets	18,428	19,804
Restricted cash and investments	131,619	104,277
Goodwill	47,820	47,820
Other assets	3,765	3,281
Deferred income taxes	12,236	11,440
Total assets	690,008	686,938
Current liabilities:
Accounts payable	5,268	8,264
Accrued payroll, payroll taxes and related benefits	247,454	222,331
Income taxes payable	786	610
Current operating lease liabilities	6,753	6,957
Current premium payable	18,853	18,920
Other accrued liabilities	6,904	12,683
Workers' compensation claims liabilities	53,622	62,917
Safety incentives liability	1,469	2,049
Total current liabilities	341,109	334,731
Long-term workers' compensation claims liabilities	124,180	153,070
Long-term premium payable	23,301
Long-term operating lease liabilities	13,049	14,225
Customer deposits and other long-term liabilities	7,923	7,070
Total liabilities	509,562	509,096
Commitments and contingencies (Notes 4 and 6)
Stockholders' equity:
Common stock, $.01 par value; 20,500 shares authorized, 6,617 and 6,871 shares issued and outstanding	66	69
Additional paid-in capital	34,847	32,744
Accumulated other comprehensive loss	(29,677)	(27,594)
Retained earnings	175,210	172,623
Total stockholders' equity	180,446	177,842
Total liabilities and stockholders' equity	$ 690,008	$ 686,938

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	20,500,000	20,500,000
Common stock, shares issued	6,617,000	6,871,000
Common stock, shares outstanding	6,617,000	6,871,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues:
Total revenues	$ 273,328	$ 273,822	$ 792,625	$ 782,376
Cost of revenues:
Total cost of revenues	204,999	206,921	615,706	608,237
Gross margin	68,329	66,901	176,919	174,139
Selling, general and administrative expenses	44,160	43,001	129,194	125,438
Depreciation and amortization	1,867	1,554	5,273	4,585
Income from operations	22,302	22,346	42,452	44,116
Other income (expense):
Investment income, net	2,412	1,584	6,856	4,790
Interest expense	(80)	(35)	(118)	(102)
Other, net	38	19	93	70
Other income, net	2,370	1,568	6,831	4,758
Income before income taxes	24,672	23,914	49,283	48,874
Provision for income taxes	6,453	6,476	13,229	13,134
Net income	$ 18,219	$ 17,438	$ 36,054	$ 35,740
Basic income per common share	$ 2.72	$ 2.48	$ 5.32	$ 4.96
Weighted average number of basic common shares outstanding	6,699	7,036	6,772	7,201
Diluted income per common share	$ 2.68	$ 2.45	$ 5.24	$ 4.91
Weighted average number of diluted common shares outstanding	6,795	7,127	6,885	7,286
Professional Employer Services [Member]
Revenues:
Total revenues	$ 251,423	$ 244,567	$ 727,986	$ 694,174
Staffing Services [Member]
Revenues:
Total revenues	21,905	29,255	64,639	88,202
Direct Payroll Costs [Member]
Cost of revenues:
Total cost of revenues	16,318	22,112	48,299	66,491
Payroll Taxes and Benefits [Member]
Cost of revenues:
Total cost of revenues	135,704	128,459	414,395	390,677
Workers' Compensation [Member]
Cost of revenues:
Total cost of revenues	$ 52,977	$ 56,350	$ 153,012	$ 151,069

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 18,219	$ 17,438	$ 36,054	$ 35,740
Unrealized gains (losses) on investments, net of tax	(3,707)	(8,900)	(2,083)	(31,882)
Comprehensive income (loss)	$ 14,512	$ 8,538	$ 33,971	$ 3,858

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Unrealized losses on investments, tax	$ (1,417)	$ (3,401)	$ (796)	$ (12,184)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
Beginning Balance at Dec. 31, 2021	$ 208,530	$ 74	$ 29,054	$ 1,079	$ 178,323
Beginning Balance, shares at Dec. 31, 2021		7,415
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards	411		411
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares		18
Common stock repurchased on vesting of restricted stock units and performance awards	(185)		(185)
Common stock repurchased on vesting of restricted stock units and performance awards, shares		(4)
Share-based compensation expense	1,830		1,830
Company repurchases of common stock	(8,575)	$ (1)	(484)		(8,090)
Company repurchases of common stock, shares		(115)
Cash dividends on common stock	(2,229)				(2,229)
Unrealized gain (loss) on investments, net of tax	(14,358)			(14,358)
Net income	288				288
Ending Balance at Mar. 31, 2022	185,712	$ 73	30,626	(13,279)	168,292
Ending Balance, shares at Mar. 31, 2022		7,314
Beginning Balance at Dec. 31, 2021	208,530	$ 74	29,054	1,079	178,323
Beginning Balance, shares at Dec. 31, 2021		7,415
Unrealized gain (loss) on investments, net of tax	(31,882)
Net income	35,740
Ending Balance at Sep. 30, 2022	171,363	$ 70	31,351	(30,803)	170,745
Ending Balance, shares at Sep. 30, 2022		6,962
Beginning Balance at Mar. 31, 2022	185,712	$ 73	30,626	(13,279)	168,292
Beginning Balance, shares at Mar. 31, 2022		7,314
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares		12
Common stock repurchased on vesting of restricted stock units and performance awards	(258)		(258)
Common stock repurchased on vesting of restricted stock units and performance awards, shares		(3)
Share-based compensation expense	1,766		1,766
Company repurchases of common stock	(19,917)	$ (2)	(1,193)		(18,722)
Company repurchases of common stock, shares		(270)
Cash dividends on common stock	(2,195)				(2,195)
Unrealized gain (loss) on investments, net of tax	(8,624)			(8,624)
Net income	18,014				18,014
Ending Balance at Jun. 30, 2022	174,498	$ 71	30,941	(21,903)	165,389
Ending Balance, shares at Jun. 30, 2022		7,053
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards	300	$ 1	299
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares		54
Common stock repurchased on vesting of restricted stock units and performance awards	(1,178)		(1,178)
Common stock repurchased on vesting of restricted stock units and performance awards, shares		(16)
Share-based compensation expense	1,893		1,893
Company repurchases of common stock	(10,560)	$ (2)	(604)		(9,954)
Company repurchases of common stock, shares		(129)
Cash dividends on common stock	(2,128)				(2,128)
Unrealized gain (loss) on investments, net of tax	(8,900)			(8,900)
Net income	17,438				17,438
Ending Balance at Sep. 30, 2022	171,363	$ 70	31,351	(30,803)	170,745
Ending Balance, shares at Sep. 30, 2022		6,962
Beginning Balance at Dec. 31, 2022	177,842	$ 69	32,744	(27,594)	172,623
Beginning Balance, shares at Dec. 31, 2022		6,871
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards	339		339
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares		31
Common stock repurchased on vesting of restricted stock units and performance awards	(1,005)		(1,005)
Common stock repurchased on vesting of restricted stock units and performance awards, shares		(11)
Share-based compensation expense	1,928		1,928
Company repurchases of common stock	(8,030)	$ (1)	(447)		(7,582)
Company repurchases of common stock, shares		(91)
Cash dividends on common stock	(2,067)				(2,067)
Unrealized gain (loss) on investments, net of tax	3,652			3,652
Net income	819				819
Ending Balance at Mar. 31, 2023	173,478	$ 68	33,559	(23,942)	163,793
Ending Balance, shares at Mar. 31, 2023		6,800
Beginning Balance at Dec. 31, 2022	177,842	$ 69	32,744	(27,594)	172,623
Beginning Balance, shares at Dec. 31, 2022		6,871
Unrealized gain (loss) on investments, net of tax	(2,083)
Net income	36,054
Ending Balance at Sep. 30, 2023	$ 180,446	$ 66	34,847	(29,677)	175,210
Ending Balance, shares at Sep. 30, 2023	6,618
Beginning Balance at Mar. 31, 2023	$ 173,478	$ 68	33,559	(23,942)	163,793
Beginning Balance, shares at Mar. 31, 2023		6,800
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards	2		2
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares		13
Common stock repurchased on vesting of restricted stock units and performance awards	(304)		(304)
Common stock repurchased on vesting of restricted stock units and performance awards, shares		(3)
Share-based compensation expense	1,963		1,963
Company repurchases of common stock	(10,145)	$ (1)	(644)		(9,500)
Company repurchases of common stock, shares		(123)
Cash dividends on common stock	(2,013)				(2,013)
Unrealized gain (loss) on investments, net of tax	(2,028)			(2,028)
Net income	17,016				17,016
Ending Balance at Jun. 30, 2023	177,969	$ 67	34,576	(25,970)	169,296
Ending Balance, shares at Jun. 30, 2023		6,687
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards	361	$ 1	360
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares		64
Common stock repurchased on vesting of restricted stock units and performance awards	(1,590)		(1,590)
Common stock repurchased on vesting of restricted stock units and performance awards, shares		(18)
Share-based compensation expense	2,136		2,136
Company repurchases of common stock	(10,917)	$ (2)	(635)		(10,280)
Company repurchases of common stock, shares		(115)
Cash dividends on common stock	(2,025)				(2,025)
Unrealized gain (loss) on investments, net of tax	(3,707)			(3,707)
Net income	18,219				18,219
Ending Balance at Sep. 30, 2023	$ 180,446	$ 66	$ 34,847	$ (29,677)	$ 175,210
Ending Balance, shares at Sep. 30, 2023	6,618

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022
Statement of Stockholders' Equity [Abstract]
Cash dividends on common stock per share	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.30

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net income	$ 36,054	$ 35,740
Reconciliations of net income to net cash used in operating activities:
Depreciation and amortization	5,273	4,585
Non-cash lease expense	5,270	5,236
Investment amortization and losses recognized	543	915
Share-based compensation	6,027	5,489
Changes in certain operating assets and liabilities:
Trade accounts receivable	(41,379)	(38,830)
Income taxes	176	899
Prepaid expenses and other	2,651	(2,561)
Accounts payable	(2,996)	68
Accrued payroll, payroll taxes and related benefits	25,801	33,093
Other accrued liabilities	(5,867)	1,769
Premium payable	23,234	9,978
Workers' compensation claims liabilities	(38,693)	(52,937)
Safety incentives liability	(580)	(1,817)
Operating lease liabilities	(5,274)	(5,005)
Other assets and liabilities, net	(241)	319
Net cash provided by (used in) operating activities	9,999	(3,059)
Cash flows from investing activities:
Purchase of property, equipment and software	(8,115)	(11,458)
Proceeds from sale of property	117
Purchase of investments	(4,386)
Proceeds from sales and maturities of investments	805	12,828
Purchase of restricted investments	(20,943)	(3,644)
Proceeds from sales and maturities of restricted investments	14,975	44,746
Net cash (used in) provided by investing activities	(17,547)	42,472
Cash flows from financing activities:
Payments on long-term debt		(3,510)
Repurchases of common stock	(29,092)	(39,052)
Common stock repurchased on vesting of stock awards	(2,899)	(1,621)
Dividends paid	(6,105)	(6,552)
Proceeds from exercise of stock options	702	711
Net cash used in financing activities	(37,394)	(50,024)
Net decrease in cash, cash equivalents and restricted cash	(44,942)	(10,611)
Cash, cash equivalents and restricted cash, beginning of period	107,378	78,629
Cash, cash equivalents and restricted cash, end of period	$ 62,436	$ 68,018

Basis of Presentation of Interi

Basis of Presentation of Interim Period Statements	9 Months Ended
Basis of Presentation of Interim Period Statements	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation of Interim Period Statements	Note 1 - Basis of Presentation of Interim Period Statements The accompanying condensed consolidated financial statements are unaudited and have been prepared by Barrett Business Services, Inc. (“BBSI”, the “Company”, “our” or “we”), pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and note disclosures typically included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, the condensed consolidated financial statements include all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of the results for the interim periods presented. The accompanying condensed financial statements are prepared on a consolidated basis. All intercompany account balances and transactions have been eliminated in consolidation. The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Actual results may differ from such estimates and assumptions. The condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s 2022 Annual Report on Form 10-K at pages 31 - 58. The results of operations for an interim period are not necessarily indicative of the results of operations for a full year. Revenue recognition Professional employer (“PEO”) services are normally used by organizations to satisfy ongoing needs related to the management of human capital and are governed by the terms of a client services agreement which covers all employees at a particular work site. Staffing revenues relate primarily to short-term staffing, contract staffing and on-site management services. The Company’s performance obligations for PEO and staffing services are satisfied, and the related revenue is recognized, as services are rendered by our workforce. Our PEO client service agreements have a minimum term of one year , are renewable on an annual basis and typically require 30 days’ written notice to cancel or terminate the contract by either party. In addition, our client service agreements provide for immediate termination upon any payment default of the client regardless of when notice is given. PEO customers are invoiced following the end of each payroll processing cycle, with payment generally due on the invoice date. Staffing customers are generally invoiced weekly based on agreed rates per employee and actual hours worked, typically with payment terms of 30 days. The amount of earned but unbilled revenue is classified as a receivable on the condensed consolidated balance sheets. We report PEO revenues net of direct payroll costs because we are not the primary obligor for these payments to our clients’ employees. Direct payroll costs include salaries, wages, health insurance, and employee out-of-pocket expenses incurred incidental to employment. We also present revenue net of safety incentives, because these incentives represent consideration payable to customers. Cost of revenues Our cost of revenues for PEO services includes employer payroll-related taxes, workers’ compensation costs and employee benefits costs. Our cost of revenues for staffing services includes direct payroll costs, employer payroll-related taxes, and workers’ compensation costs. Direct payroll costs represent the gross payroll earned by staffing services employees based on salary or hourly wages. Payroll taxes and benefits consist of the employer’s portion of Social Security and Medicare taxes, federal and state unemployment taxes, and employee benefit costs, which primarily comprises health insurance premiums paid to third-party insurers and direct support payroll. Workers’ compensation costs consist primarily of premiums paid to third-party insurers, claims reserves, claims administration fees, legal fees, medical cost containment (“MCC”) expense, state administrative agency fees, third-party broker commissions, and risk manager payroll, as well as costs associated with operating our two wholly owned insurance companies, Associated Insurance Company for Excess (“AICE”) and Ecole Insurance Company (“Ecole”). Cash and cash equivalents We consider non-restricted short-term investments that are highly liquid, readily convertible into cash, with maturities at acquisition of less than three months to be cash equivalents for purposes of the condensed consolidated statements of cash flows and condensed consolidated balance sheets. The Company maintains cash balances in bank accounts that normally exceed FDIC insured limits. The Company has not experienced any losses related to its cash concentration. Investments The Company classifies investments as available-for-sale. The Company’s investments are reported at fair value with unrealized gains and losses, net of taxes, shown as a component of accumulated other comprehensive income (loss) in stockholders’ equity. Investments are recorded as current on the condensed consolidated balance sheets as the invested funds are available for current operations. Management considers available evidence in evaluating potential impairment of investments, including the extent to which fair value is less than cost and adverse conditions related to the security. In the event of a credit loss, an allowance would be recognized to the extent that the fair value of the security is less than the present value of the expected future cash flows. Realized gains and losses on sales of investments are included in investment income in our condensed consolidated statements of operations. Restricted cash and investments The Company holds restricted cash and investments primarily for the future payment of insurance premiums and workers’ compensation claims. These investments are categorized as available-for-sale. They are reported at fair value with unrealized gains and losses, net of taxes, shown as a component of accumulated other comprehensive income (loss) in stockholders’ equity. Restricted cash and investments are classified as current and noncurrent on the condensed consolidated balance sheets based on the nature of the restriction. Management considers available evidence in evaluating potential impairment of restricted investments, including the extent to which fair value is less than cost and adverse conditions related to the security. In the event of a credit loss, an allowance would be recognized to the extent that the fair value of the security is less than the present value of the expected future cash flows. Realized gains and losses on sales of restricted investments are included in investment income in our condensed consolidated statements of operations. Restricted cash and investments also includes investments held as part of the Company’s deferred compensation plan. These investments are classified as trading securities and are recorded at fair value with unrealized gains and losses reported as a component of income (loss) from operations. Allowance for doubtful accounts The Company had an allowance for doubtful accounts of $ 885,000 and $ 893,000 at September 30, 2023 and December 31, 2022 , respectively. We make estimates of the collectability of our accounts receivable for services provided to our customers based on future expected credit losses. Management analyzes historical bad debts, customer concentrations, customer credit-worthiness, current economic trends and changes in customers’ payment trends when evaluating the adequacy of the allowance for doubtful accounts. If the financial condition of our customers deteriorates, resulting in an impairment of their ability to make payments, additional allowances may be required. Workers’ compensation claims liabilities Our workers’ compensation claims liabilities do not represent an exact calculation of liability but rather management’s best estimate, utilizing actuarial expertise and projection techniques, at a given reporting date. The estimated liability for open workers’ compensation claims is based on an evaluation of information provided by our third-party administrator for workers’ compensation claims, coupled with an actuarial estimate of future loss development with respect to reported claims and incurred but not reported claims (together, “IBNR”). Workers’ compensation claims liabilities include case reserve estimates for reported losses, plus additional amounts for estimated IBNR claims, MCC and legal costs, unallocated loss adjustment expenses and estimated future recoveries. The estimate of incurred costs expected to be paid within one year is included in current liabilities, while the estimate of incurred costs expected to be paid beyond one year is included in long-term liabilities on our condensed consolidated balance sheets. These estimates are reviewed at least quarterly and adjustments to estimated liabilities are reflected in current operating results as they become known. The process of arriving at an estimate of unpaid claims and claims adjustment expense involves a high degree of judgment and is affected by both internal and external events, including changes in claims handling practices, changes in reserve estimation procedures, inflation, trends in the litigation and settlement of pending claims, and legislative changes. Our estimates are based on actuarial analysis and informed judgment, derived from individual experience and expertise applied to multiple sets of data and analyses. We consider significant facts and circumstances known both at the time that loss reserves are initially established and as new facts and circumstances become known. Due to the inherent uncertainty underlying loss reserve estimates, the expenses incurred through final resolution of our liability for our workers’ compensation claims will likely vary from the related loss reserves at the reporting date. Therefore, as specific claims are paid out in the future, actual paid losses may be materially different from our current loss reserves. A basic premise in most actuarial analyses is that historical data and past patterns demonstrated in the incurred and paid historical data form a reasonable basis upon which to project future outcomes, absent a material change. Significant structural changes to the available data can materially impact the reserve estimation process. To the extent a material change affecting the ultimate claim liability becomes known, such change is quantified to the extent possible through an analysis of internal Company data and, if available and when appropriate, external data. Nonetheless, actuaries exercise a considerable degree of judgment in the evaluation of these factors and the need for such actuarial judgment is more pronounced when faced with material uncertainties. Safety incentives We accrue for and present expected safety incentives as a reduction of revenue. Safety incentives represent cash incentives paid to certain PEO client companies for maintaining safe-work practices and minimizing workplace injuries. The incentive is based on a percentage of annual payroll and is paid annually to customers who meet predetermined workers’ compensation claims cost objectives. Safety incentive payments are made only after closure of all workers’ compensation claims incurred during the customer’s contract period. The safety incentive liability is estimated and accrued each month based upon contract year-to-date payroll and the then current amount of the customer’s estimated workers’ compensation claims reserves as established by us and our third-party administrator. In July 2020, the Company began limiting its safety incentive offering in certain markets. The Company provided $ 1.5 million and $ 2.0 million at September 30, 2023 and December 31, 2022 , respectively, as an estimate of the liability for unpaid safety incentives. Customer deposits We require deposits from certain PEO customers to cover a portion of our accounts receivable due from such customers in the event of default of payment. Comprehensive income (loss) Comprehensive income (loss) includes all changes in equity during a period except those that resulted from investments by or distributions to the Company’s stockholders. Other comprehensive income (loss) refers to revenues, expenses, gains and losses that under U.S. generally accepted accounting principles (“GAAP”) are included in comprehensive income (loss), but excluded from net income (loss) as these amounts are recorded directly as an adjustment to stockholders’ equity. Our other comprehensive income (loss) comprises unrealized holding gains and losses on our available-for-sale investments. Statements of cash flows Interest paid during the nine months ended September 30, 2023 and 2022 did not materially differ from interest expense. Income taxes paid by the Company during the nine months ended September 30, 2023 and 2022 totaled $ 13.0 million and $ 12.2 mil lion, respectively. Bank deposits and other cash equivalents that are restricted for use are classified as restricted cash. The table below reconciles the cash, cash equivalents and restricted cash balances from our condensed consolidated balance sheets to the amounts reported on the condensed consolidated statements of cash flows (in thousands): September 30, December 31, September 30, December 31, 2023 2022 2022 2021 Cash and cash equivalents $ 41,579 $ 91,423 $ 58,951 $ 69,405 Restricted cash, included in restricted cash and 20,857 15,955 9,067 9,224 Total cash, cash equivalents and restricted cash $ 62,436 $ 107,378 $ 68,018 $ 78,629 Basic and diluted earnings per share Basic earnings per share are computed based on the weighted average number of common shares outstanding for each year using the treasury method. Diluted earnings per share reflect the potential effects of the issuance of shares in connection with the exercise of outstanding stock options, vesting of outstanding restricted stock units and performance share units, and the Company’s employee stock purchase plan. Basic and diluted shares outstanding are summarized as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Weighted average number of basic shares outstanding 6,699 7,036 6,772 7,201 Effect of dilutive securities 96 91 113 85 Weighted average number of diluted shares outstanding 6,795 7,127 6,885 7,286 Accounting estimates The preparation of our condensed consolidated financial statements, in conformity with GAAP, requires management to make estimates and assumptions. These affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of revenues and expenses during the reporting periods. Management bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Estimates are used for fair value measurement of investments, allowance for doubtful accounts, deferred income taxes, carrying values for goodwill and property, equipment and software, accrued workers’ compensation liabilities and safety incentive liabilities. Actual results may or may not differ from such estimates. Reclassifications To conform to the current period’s presentation, premiums payable to third party insurance carriers of $ 18.9 million were reclassified from other accrued liabilities to current premium payable in the prior period condensed consolidated balance sheets and premiums payable to third party insurance carriers of $ 10.0 million were reclassified from other accrued liabilities to premium payable in the prior period condensed consolidated statements of cash flows.

Fair Value Measurement

Fair Value Measurement	9 Months Ended
Fair Value Measurement	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurement	Note 2 - Fair Value Measurement The following table summarizes the Company’s investments at September 30, 2023 and December 31, 2022 measured at fair value on a recurring basis (in thousands): September 30, 2023 December 31, 2022 Gross Gross Unrealized Recorded Unrealized Recorded Cost Losses Basis Cost Losses Basis Current: Cash equivalents: U.S. treasuries $ 8,398 $ - $ 8,398 $ - $ - $ - Money market funds 1,502 - 1,502 40,296 - 40,296 Total cash equivalents 9,900 - 9,900 40,296 - 40,296 Investments: Corporate bonds 38,525 ( 5,088 ) 33,437 38,489 ( 5,181 ) 33,308 U.S. treasuries 16,690 ( 1,683 ) 15,007 - - - Asset backed securities 13,672 ( 341 ) 13,331 13,709 ( 737 ) 12,972 U.S. government agency securities 12,853 ( 635 ) 12,218 7,369 ( 302 ) 7,067 Mortgage backed securities 15,351 ( 3,676 ) 11,675 16,135 ( 3,139 ) 12,996 Emerging markets 2,014 ( 29 ) 1,985 2,044 ( 62 ) 1,982 Total current investments 99,105 ( 11,452 ) 87,653 77,746 ( 9,421 ) 68,325 Restricted cash and investments (1) : U.S. treasuries 83,064 ( 8,532 ) 74,532 66,479 ( 9,222 ) 57,257 Corporate bonds 82,708 ( 11,823 ) 70,885 81,993 ( 11,296 ) 70,697 Mortgage backed securities 43,389 ( 7,574 ) 35,815 46,138 ( 6,045 ) 40,093 U.S. government agency securities 16,872 ( 1,629 ) 15,243 26,479 ( 2,156 ) 24,323 Mutual funds 7,857 - 7,857 6,301 - 6,301 Asset backed securities 799 ( 9 ) 790 9 - 9 Money market funds 173 - 173 646 - 646 Total restricted cash and 234,862 ( 29,567 ) 205,295 228,045 ( 28,719 ) 199,326 Total investments $ 343,867 $ ( 41,019 ) $ 302,848 $ 346,087 $ ( 38,140 ) $ 307,947 (1) Included in restricted cash and investments within the condensed consolidated balance sheets is restricted cash of $ 2.1 million and $ 15.9 million as of September 30, 2023 and December 31, 2022 , respectively, which is excluded from the table above. Restricted cash and investments are classified as current and noncurrent on the balance sheet based on the nature of the restriction. The following table summarizes the Company’s investments at September 30, 2023 and December 31, 2022 measured at fair value on a recurring basis by fair value hierarchy level (in thousands): September 30, 2023 December 31, 2022 Total Total Recorded Recorded Basis Level 1 Level 2 Other (1) Basis Level 1 Level 2 Other (1) Cash equivalents: U.S. treasuries $ 8,398 $ - $ 8,398 $ - $ - $ - $ - $ - Money market 1,502 - - 1,502 40,296 - - 40,296 Investments: Corporate bonds 33,437 - 33,437 - 33,308 - 33,308 - U.S. treasuries 15,007 - 15,007 - - - - - Asset backed securities 13,331 - 13,331 - 12,972 - 12,972 - U.S. government 12,218 - 12,218 - 7,067 - 7,067 - Mortgage backed 11,675 - 11,675 - 12,996 - 12,996 - Emerging markets 1,985 - 1,985 - 1,982 - 1,982 - Restricted cash and U.S. treasuries 74,532 - 74,532 - 57,257 - 57,257 - Corporate bonds 70,885 - 70,885 - 70,697 - 70,697 - Mortgage backed 35,815 - 35,815 - 40,093 - 40,093 - U.S. government 15,243 - 15,243 - 24,323 - 24,323 - Mutual funds 7,857 7,857 - - 6,301 6,301 - - Asset backed securities 790 - 790 - 9 - 9 - Money market 173 - - 173 646 - - 646 Total investments $ 302,848 $ 7,857 $ 293,316 $ 1,675 $ 307,947 $ 6,301 $ 260,704 $ 40,942 (1) Investments in money market funds measured at fair value using the net asset value per share practical expedient are not subject to hierarchy level classification disclosure. The Company invests in money market funds that seek to maintain a stable net asset value. These investments include commingled funds that comprise high-quality short-term securities representing liquid debt and monetary instruments where the redemption value is likely to be the fair value. Redemption is permitted daily without written notice. The following table summarizes the contractual maturities of the Company’s available-for-sale securities at September 30, 2023 and December 31, 2022. Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties. The table also includes money market funds, which are classified as cash and cash equivalents on the Company’s consolidated balance sheets. September 30, 2023 (In thousands) Less than Between 1 to Between 5 to After 10 Years Total Corporate bonds $ 3,209 $ 65,749 $ 35,197 $ 167 $ 104,322 U.S. treasuries 42,587 26,839 28,511 - 97,937 U.S. government agency securities 38 25,448 1,975 - 27,461 Asset backed securities - 790 12,073 1,258 14,121 Emerging markets 1,985 - - - 1,985 Money market funds 1,675 - - - 1,675 Total $ 49,494 $ 118,826 $ 77,756 $ 1,425 $ 247,501 December 31, 2022 (In thousands) Less than Between 1 to Between 5 to After 10 Years Total Corporate bonds $ 646 $ 50,439 $ 52,920 $ - $ 104,005 U.S. treasuries 440 3,405 53,412 - 57,257 Money market funds 40,539 - - - 40,539 U.S. government agency securities 3,943 24,025 3,422 - 31,390 Asset backed securities - 9 2,113 10,859 12,981 Emerging markets - 1,982 - - 1,982 Total $ 45,568 $ 79,860 $ 111,867 $ 10,859 $ 248,154 The average contractual maturity of mortgage backed securities, which are excluded from the table above, was 23 years and 24 years as of September 30, 2023 and December 31, 2022 , respectively.

Workers' Compensation Claims

Workers' Compensation Claims	9 Months Ended
Workers' Compensation Claims	Sep. 30, 2023
Text Block [Abstract]
Workers' Compensation Claims	Note 3 – Workers’ Compensation Claims The following table summarizes the aggregate workers’ compensation reserve activity (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Beginning balance Workers' compensation claims liabilities $ 191,823 $ 241,510 $ 215,987 $ 279,407 Add: claims expense accrual Current period 3,792 4,854 11,636 13,678 Prior periods ( 4,098 ) ( 1,360 ) ( 6,792 ) ( 10,737 ) ( 306 ) 3,494 4,844 2,941 Less: claim payments related to Current period 1,240 1,714 2,005 2,742 Prior periods 12,244 16,846 41,532 53,136 13,484 18,560 43,537 55,878 Change in claims incurred in excess of retention limits ( 231 ) 899 508 873 Ending balance Workers' compensation claims liabilities $ 177,802 $ 227,343 $ 177,802 $ 227,343 Incurred but not reported (IBNR) $ 82,076 $ 117,587 $ 82,076 $ 117,587 Ratio of IBNR to workers' compensation claims liabilities 46 % 52 % 46 % 52 % Insured program The Company provides workers’ compensation coverage for client employees primarily through arrangements with fully licensed, third-party insurers (the “insured program”). Under this program, carriers issue policies or afford coverage to the Company’s clients under a program maintained by the Company. Approximately 84 % of the Company’s workers’ compensation exposure is covered through the insured program. Effective July 1, 2021, the Company entered into a new arrangement for its insured program, whereby third-party insurers assumed all risk of loss for claims incurred from July 1, 2021 to June 30, 2022 (the “2021-2022 Policy”). The arrangement for the insured program was renewed for claims incurred from July 1, 2022 to June 30, 2023 (the “2022-2023 Policy”) and for claims incurred from July 1, 2023 to June 30, 2024 (the “2023-2024 Policy”). The 2021-2022 Policy, 2022-2023 Policy, and 2023-2024 Policy allow for premium adjustments depending on overall policy performance. If claims develop favorably, BBSI can participate in savings up to $ 20.0 million, $ 22.5 million, and $ 28.5 million for the 2021-2022 Policy, 2022-2023 Policy, and 2023-2024 Policy, respectively. If claims develop adversely, additional premium may be charged up to $ 7.5 million under the 2021-2022 Policy. No additional premiums may be charged if claims develop adversely under the 2022-2023 Policy and the 2023-2024 Policy. For claims incurred under the insured program prior to July 1, 2021, the Company retains risk of loss up to the first $ 3.0 million per occurrence on policies issued after June 30, 2020 and $ 5.0 million per occurrence on policies issued before that date. On June 29, 2020, the Company entered into a loss portfolio transfer agreement (“LPT 1”) to remove all outstanding workers’ compensation claims obligations for claims incurred under its insured program between February 1, 2014 and December 31, 2017. On June 30, 2021, the Company entered into a loss portfolio transfer agreement (“LPT 2”) to remove all remaining outstanding workers’ compensation claims obligations for client policies issued under its insured program up to June 30, 2018. The following is a summary of the risk retained by the Company under its insured program after considering the effects of the loss portfolio transfers and current insurance arrangements: Year Claims risk retained 2014 No 2015 No 2016 No 2017 No 2018 (1) No 2019 (1) Yes 2020 Yes 2021 - Through June 30 Yes 2021 - July 1 and after No 2022 No 2023 No (1) LPT 2 excluded approximately 10 % of claims from 2018 and included an approximately offsetting amount of claims from 2019. The Company is required to maintain minimum collateral levels for certain policies issued under the insured program, which is held in a trust account (the “trust account”). The balance in the trust account was $ 178.7 million and $ 188.2 million at September 30, 2023 and December 31, 2022, respectively. The trust account balance is included as a component of the current and long-term restricted cash and investments in the Company’s condensed consolidated balance sheets. Self-insured programs The Company is a self-insured employer with respect to workers' compensation coverage for all employees, including employees of PEO clients that elect to participate in our workers’ compensation program, working in Colorado, Maryland and Oregon. In the state of Washington, state law allows only the Company's staffing services and internal management employees to be covered under the Company's self-insured workers' compensation program. The Company also operates a wholly owned, fully licensed insurance company, Ecole, which provides workers’ compensation coverage to client employees working in Arizona and Utah. Approximately 16 % of the Company’s workers’ compensation exposure is covered through self-insurance or Ecole (the “self-insured programs”). For all claims incurred under the Company’s self-insured programs, the Company retains risk of loss up to the first $ 3.0 million per occurrence, except in Maryland and Colorado, where the Company’s retention per occurrence is $ 1.0 million and $ 2.0 million, respectively. For claims incurred under the Company’s self-insured programs prior to July 1, 2020, the Company retains risk of loss up to the first $ 5.0 million per occurrence, except in Maryland and Colorado, where the retention per occurrence is $ 1.0 million and $ 2.0 million, respectively. The states of California, Maryland, Oregon, Washington, Colorado and Delaware required the Company to maintain collateral totaling $ 48.1 million and $ 54.5 million at September 30, 2023 and December 31, 2022, respectively, to cover potential workers’ compensation claims losses related to the Company’s current and former status as a self-insured employer. At September 30, 2023 , the Company provided surety bonds totaling $ 48.1 million, including a California requirement of $ 17.2 million. Claims liabilities The Company provided a total of $ 177.8 million and $ 216.0 million at September 30, 2023 and December 31, 2022 , respectively, as an estimated future liability for unsettled workers' compensation claims liabilities. Of this amount, $ 3.5 million and $ 3.0 million at September 30, 2023 and December 31, 2022 , respectively, represent case reserves incurred in excess of the Company’s retention. The accrual for costs incurred in excess of retention limits is offset by a receivable from insurance carriers of $ 3.5 million and $ 3.0 million at September 30, 2023 and December 31, 2022 , respectively, included in other assets in the condensed consolidated balance sheets.

Revolving Credit Facility and L

Revolving Credit Facility and Long-Term Debt	9 Months Ended
Revolving Credit Facility and Long-Term Debt	Sep. 30, 2023
Debt Disclosure [Abstract]
Revolving Credit Facility and Long-Term Debt	Note 4 - Revolving Credit Facility and Long-Term Debt The Company maintains an agreement (the "Agreement") with Wells Fargo Bank, N.A. (the "Bank") for a revolving credit line of $ 50.0 million and a sublimit for standby letters of credit of $ 25.0 million. Advances under the revolving credit line bear interest, as selected by the Company, of (a) the daily Simple Secured Overnight Financing Rate (“SOFR”) plus 1.75 % or (b) one-month Term SOFR plus 1.75 %. The Agreement also provides for an unused commitment fee of 0.35 % per year on the average daily unused amount of the revolving credit line, as well as a fee of 1.75 % of the face amount of each letter of credit reserved under the line of credit. The Company had no outstanding borrowings on its revolving credit line at September 30, 2023 and December 31, 2022. The credit facility is collateralized by the Company’s accounts receivable and other rights to receive payment. The Agreement requires the satisfaction of certain financial covenants as follows: • adjusted free cash flow [net profit after taxes plus interest expense (net of capitalized interest), depreciation expense, and amortization expense, less dividends/distributions] not less than $ 10 million as of each fiscal quarter end, determined on a rolling 4-quarter basis • tangible net worth [aggregate of total stockholders' equity plus subordinated debt less any intangible assets and less any loans or advances to, or investments in, any related entities or individuals] not less than $ 50 million at each fiscal quarter end; and The Agreement imposes certain additional restrictions unless the Bank provides its prior written consent as follows: • incurring additional indebtedness is prohibited, other than purchase financing for the acquisition of assets, provided that the aggregate of all purchase financing does not exceed $ 1 million at any time; • the Company may not terminate or cancel any of the AICE policies; and • if an event of default would occur, and is continuing, including on a pro forma basis, no dividends or distributions would be permitted to be paid and redemptions and repurchases of the Company's stock would be permitted only up to $ 15 million in any rolling 12-month period. The Agreement also contains customary events of default and specified cross-defaults under the Company's workers' compensation insurance arrangements. If an event of default under The Agreement occurs and is continuing, the Bank may declare any outstanding obligations under the Agreement to be immediately due and payable. At September 30, 2023, the Company was in compliance with all covenants.

Income Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Note 5 – Income Taxes Under ASC 740, “Income Taxes,” management evaluates the realizability of the deferred tax assets on a quarterly basis under a “more likely than not” standard. As part of this evaluation, management reviews all evidence, both positive and negative, to determine if a valuation allowance is needed. One component of this analysis is to determine whether the Company was in a cumulative loss position for the most recent 12 quarters. The Company was in a cumulative income position for the 12 quarters ended September 30, 2023. The Company’s realization of a portion of net deferred tax assets is based in part on our estimates of the timing of reversals of certain temporary differences and on the generation of taxable income before such reversals. The Company is subject to income taxes in U.S. federal and multiple state and local tax jurisdictions. The Internal Revenue Service (the "IRS") is examining the Company’s federal tax returns for the years ended December 31, 2017 through 2021 . BBSI received notice that the IRS intends to disallow certain wage-based tax credits claimed for the years 2017 through 2020 , which could result in estimated total additional taxes of $ 7.4 million and penalties of $ 1.7 million. Tax year 2021 remains under audit; disallowance of similar wage-based credits would result in additional estimated tax due of $ 0.6 million. The Company disagrees with the IRS determination to disallow certain wage-based credits taken by the Company and believes that the Company has the technical merits to defend its position. Based on management’s more-likely-than-not assessment that the position is sustainable, no reserve for the aforementioned IRS notices of disallowance of wage-based tax credits or underpayment penalties has been recorded in the financial statements. In the major jurisdictions where it operates, the Company is generally no longer subject to income tax examinations by tax authorities for tax years before 2016. As of September 30, 2023 and December 31, 2022, total gross unrecognized tax benefits, excluding interest and penalties, of $ 0.6 million would affect the Company's effective tax rate if recognized in future periods. The Company does not anticipate any material changes to the reserve in the next 12 months. A portion of the consolidated income the Company generates is not subject to state income tax. Depending on the percentage of this income as compared to total consolidated income, the Company's state effective tax rate could fluctuate from expectations. At September 30, 2023 , the Company had no state operating loss carryforwards. At September 30, 2023 , the Company did no t have a federal general business tax credit carryforward or an alternative minimum tax credit carryforward.

Litigation

Litigation	9 Months Ended
Litigation	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Litigation	Note 6 – Litigation On April 5, 2011, several individual plaintiffs filed a wage and hour class action in the California Superior Court, County of Fresno, naming as defendants their employer, a Merry Maids franchisee; BBSI, which was providing PEO services to the franchisee; and various parties related to the franchisor. Plaintiffs claimed, among other things, that BBSI and the franchisor were their joint employer with franchisee and therefore jointly responsible for the alleged wage and hour violations. The case was subsequently removed to the United States District Court for the Eastern District of California, and on January 18, 2019, the District Court certified a class of former non-exempt employees who resided in California and worked for the franchisee in certain positions during the period from April 6, 2007 through January 19, 2019. On November 30, 2020, the District Court granted BBSI’s motion for summary judgment to be removed from the case. Thereafter the plaintiffs appealed to the United States Court of Appeals for the Ninth Circuit, and on June 2, 2022, the Court of Appeals reversed the order granting summary judgment to BBSI. The court held that there is a triable issue of fact concerning whether or not BBSI was a joint-employer under applicable California law. BBSI intends to vigorously defend the claim, including continuing to assert its defense on the ground that it was not a joint-employer of plaintiffs. Given the uncertainties surrounding this litigation, management is unable to estimate a potential range of loss. In addition to the matter above, BBSI is subject to other legal proceedings and claims that arise in the ordinary course of our business. There are significant uncertainties surrounding litigation. For the matter discussed above, as well as other cases, management has recorded estimated liabilities totaling $ 0.2 million in other accrued liabilities in the condensed consolidated balance sheets.

Subsequent Events

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2023
Subsequent Events [Abstract]
Subsequent Events	Note 7 – Subsequent Events We have evaluated events and transactions occurring after the balance sheet date through our filing date and noted no events that are subject to recognition or disclosure.

Basis of Presentation of Inte_2

Basis of Presentation of Interim Period Statements (Policies)	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue recognition	Revenue recognition Professional employer (“PEO”) services are normally used by organizations to satisfy ongoing needs related to the management of human capital and are governed by the terms of a client services agreement which covers all employees at a particular work site. Staffing revenues relate primarily to short-term staffing, contract staffing and on-site management services. The Company’s performance obligations for PEO and staffing services are satisfied, and the related revenue is recognized, as services are rendered by our workforce. Our PEO client service agreements have a minimum term of one year , are renewable on an annual basis and typically require 30 days’ written notice to cancel or terminate the contract by either party. In addition, our client service agreements provide for immediate termination upon any payment default of the client regardless of when notice is given. PEO customers are invoiced following the end of each payroll processing cycle, with payment generally due on the invoice date. Staffing customers are generally invoiced weekly based on agreed rates per employee and actual hours worked, typically with payment terms of 30 days. The amount of earned but unbilled revenue is classified as a receivable on the condensed consolidated balance sheets. We report PEO revenues net of direct payroll costs because we are not the primary obligor for these payments to our clients’ employees. Direct payroll costs include salaries, wages, health insurance, and employee out-of-pocket expenses incurred incidental to employment. We also present revenue net of safety incentives, because these incentives represent consideration payable to customers.
Cost of revenues	Cost of revenues Our cost of revenues for PEO services includes employer payroll-related taxes, workers’ compensation costs and employee benefits costs. Our cost of revenues for staffing services includes direct payroll costs, employer payroll-related taxes, and workers’ compensation costs. Direct payroll costs represent the gross payroll earned by staffing services employees based on salary or hourly wages. Payroll taxes and benefits consist of the employer’s portion of Social Security and Medicare taxes, federal and state unemployment taxes, and employee benefit costs, which primarily comprises health insurance premiums paid to third-party insurers and direct support payroll. Workers’ compensation costs consist primarily of premiums paid to third-party insurers, claims reserves, claims administration fees, legal fees, medical cost containment (“MCC”) expense, state administrative agency fees, third-party broker commissions, and risk manager payroll, as well as costs associated with operating our two wholly owned insurance companies, Associated Insurance Company for Excess (“AICE”) and Ecole Insurance Company (“Ecole”).
Cash and cash equivalents	Cash and cash equivalents We consider non-restricted short-term investments that are highly liquid, readily convertible into cash, with maturities at acquisition of less than three months to be cash equivalents for purposes of the condensed consolidated statements of cash flows and condensed consolidated balance sheets. The Company maintains cash balances in bank accounts that normally exceed FDIC insured limits. The Company has not experienced any losses related to its cash concentration.
Investments	Investments The Company classifies investments as available-for-sale. The Company’s investments are reported at fair value with unrealized gains and losses, net of taxes, shown as a component of accumulated other comprehensive income (loss) in stockholders’ equity. Investments are recorded as current on the condensed consolidated balance sheets as the invested funds are available for current operations. Management considers available evidence in evaluating potential impairment of investments, including the extent to which fair value is less than cost and adverse conditions related to the security. In the event of a credit loss, an allowance would be recognized to the extent that the fair value of the security is less than the present value of the expected future cash flows. Realized gains and losses on sales of investments are included in investment income in our condensed consolidated statements of operations.
Restricted cash and investments	Restricted cash and investments The Company holds restricted cash and investments primarily for the future payment of insurance premiums and workers’ compensation claims. These investments are categorized as available-for-sale. They are reported at fair value with unrealized gains and losses, net of taxes, shown as a component of accumulated other comprehensive income (loss) in stockholders’ equity. Restricted cash and investments are classified as current and noncurrent on the condensed consolidated balance sheets based on the nature of the restriction. Management considers available evidence in evaluating potential impairment of restricted investments, including the extent to which fair value is less than cost and adverse conditions related to the security. In the event of a credit loss, an allowance would be recognized to the extent that the fair value of the security is less than the present value of the expected future cash flows. Realized gains and losses on sales of restricted investments are included in investment income in our condensed consolidated statements of operations. Restricted cash and investments also includes investments held as part of the Company’s deferred compensation plan. These investments are classified as trading securities and are recorded at fair value with unrealized gains and losses reported as a component of income (loss) from operations.
Allowance for doubtful accounts	Allowance for doubtful accounts The Company had an allowance for doubtful accounts of $ 885,000 and $ 893,000 at September 30, 2023 and December 31, 2022 , respectively. We make estimates of the collectability of our accounts receivable for services provided to our customers based on future expected credit losses. Management analyzes historical bad debts, customer concentrations, customer credit-worthiness, current economic trends and changes in customers’ payment trends when evaluating the adequacy of the allowance for doubtful accounts. If the financial condition of our customers deteriorates, resulting in an impairment of their ability to make payments, additional allowances may be required.
Workers' compensation claims liabilities	Workers’ compensation claims liabilities Our workers’ compensation claims liabilities do not represent an exact calculation of liability but rather management’s best estimate, utilizing actuarial expertise and projection techniques, at a given reporting date. The estimated liability for open workers’ compensation claims is based on an evaluation of information provided by our third-party administrator for workers’ compensation claims, coupled with an actuarial estimate of future loss development with respect to reported claims and incurred but not reported claims (together, “IBNR”). Workers’ compensation claims liabilities include case reserve estimates for reported losses, plus additional amounts for estimated IBNR claims, MCC and legal costs, unallocated loss adjustment expenses and estimated future recoveries. The estimate of incurred costs expected to be paid within one year is included in current liabilities, while the estimate of incurred costs expected to be paid beyond one year is included in long-term liabilities on our condensed consolidated balance sheets. These estimates are reviewed at least quarterly and adjustments to estimated liabilities are reflected in current operating results as they become known. The process of arriving at an estimate of unpaid claims and claims adjustment expense involves a high degree of judgment and is affected by both internal and external events, including changes in claims handling practices, changes in reserve estimation procedures, inflation, trends in the litigation and settlement of pending claims, and legislative changes. Our estimates are based on actuarial analysis and informed judgment, derived from individual experience and expertise applied to multiple sets of data and analyses. We consider significant facts and circumstances known both at the time that loss reserves are initially established and as new facts and circumstances become known. Due to the inherent uncertainty underlying loss reserve estimates, the expenses incurred through final resolution of our liability for our workers’ compensation claims will likely vary from the related loss reserves at the reporting date. Therefore, as specific claims are paid out in the future, actual paid losses may be materially different from our current loss reserves. A basic premise in most actuarial analyses is that historical data and past patterns demonstrated in the incurred and paid historical data form a reasonable basis upon which to project future outcomes, absent a material change. Significant structural changes to the available data can materially impact the reserve estimation process. To the extent a material change affecting the ultimate claim liability becomes known, such change is quantified to the extent possible through an analysis of internal Company data and, if available and when appropriate, external data. Nonetheless, actuaries exercise a considerable degree of judgment in the evaluation of these factors and the need for such actuarial judgment is more pronounced when faced with material uncertainties.
Safety incentives	Safety incentives We accrue for and present expected safety incentives as a reduction of revenue. Safety incentives represent cash incentives paid to certain PEO client companies for maintaining safe-work practices and minimizing workplace injuries. The incentive is based on a percentage of annual payroll and is paid annually to customers who meet predetermined workers’ compensation claims cost objectives. Safety incentive payments are made only after closure of all workers’ compensation claims incurred during the customer’s contract period. The safety incentive liability is estimated and accrued each month based upon contract year-to-date payroll and the then current amount of the customer’s estimated workers’ compensation claims reserves as established by us and our third-party administrator. In July 2020, the Company began limiting its safety incentive offering in certain markets. The Company provided $ 1.5 million and $ 2.0 million at September 30, 2023 and December 31, 2022 , respectively, as an estimate of the liability for unpaid safety incentives.
Customer deposits	Customer deposits We require deposits from certain PEO customers to cover a portion of our accounts receivable due from such customers in the event of default of payment.
Comprehensive income (loss)	Comprehensive income (loss) Comprehensive income (loss) includes all changes in equity during a period except those that resulted from investments by or distributions to the Company’s stockholders. Other comprehensive income (loss) refers to revenues, expenses, gains and losses that under U.S. generally accepted accounting principles (“GAAP”) are included in comprehensive income (loss), but excluded from net income (loss) as these amounts are recorded directly as an adjustment to stockholders’ equity. Our other comprehensive income (loss) comprises unrealized holding gains and losses on our available-for-sale investments.
Statements of cash flows	Statements of cash flows Interest paid during the nine months ended September 30, 2023 and 2022 did not materially differ from interest expense. Income taxes paid by the Company during the nine months ended September 30, 2023 and 2022 totaled $ 13.0 million and $ 12.2 mil lion, respectively. Bank deposits and other cash equivalents that are restricted for use are classified as restricted cash. The table below reconciles the cash, cash equivalents and restricted cash balances from our condensed consolidated balance sheets to the amounts reported on the condensed consolidated statements of cash flows (in thousands): September 30, December 31, September 30, December 31, 2023 2022 2022 2021 Cash and cash equivalents $ 41,579 $ 91,423 $ 58,951 $ 69,405 Restricted cash, included in restricted cash and 20,857 15,955 9,067 9,224 Total cash, cash equivalents and restricted cash $ 62,436 $ 107,378 $ 68,018 $ 78,629
Basic and diluted earnings per share	Basic and diluted earnings per share Basic earnings per share are computed based on the weighted average number of common shares outstanding for each year using the treasury method. Diluted earnings per share reflect the potential effects of the issuance of shares in connection with the exercise of outstanding stock options, vesting of outstanding restricted stock units and performance share units, and the Company’s employee stock purchase plan. Basic and diluted shares outstanding are summarized as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Weighted average number of basic shares outstanding 6,699 7,036 6,772 7,201 Effect of dilutive securities 96 91 113 85 Weighted average number of diluted shares outstanding 6,795 7,127 6,885 7,286
Accounting estimates	Accounting estimates The preparation of our condensed consolidated financial statements, in conformity with GAAP, requires management to make estimates and assumptions. These affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of revenues and expenses during the reporting periods. Management bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Estimates are used for fair value measurement of investments, allowance for doubtful accounts, deferred income taxes, carrying values for goodwill and property, equipment and software, accrued workers’ compensation liabilities and safety incentive liabilities. Actual results may or may not differ from such estimates.
Reclassifications	Reclassifications To conform to the current period’s presentation, premiums payable to third party insurance carriers of $ 18.9 million were reclassified from other accrued liabilities to current premium payable in the prior period condensed consolidated balance sheets and premiums payable to third party insurance carriers of $ 10.0 million were reclassified from other accrued liabilities to premium payable in the prior period condensed consolidated statements of cash flows.

Basis of Presentation of Inte_3

Basis of Presentation of Interim Period Statements (Tables)	9 Months Ended
Basis of Presentation of Interim Period Statements (Tables)	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Reconciles of Cash, Cash Equivalents and Restricted Cash Balances	The table below reconciles the cash, cash equivalents and restricted cash balances from our condensed consolidated balance sheets to the amounts reported on the condensed consolidated statements of cash flows (in thousands): September 30, December 31, September 30, December 31, 2023 2022 2022 2021 Cash and cash equivalents $ 41,579 $ 91,423 $ 58,951 $ 69,405 Restricted cash, included in restricted cash and 20,857 15,955 9,067 9,224 Total cash, cash equivalents and restricted cash $ 62,436 $ 107,378 $ 68,018 $ 78,629
Summary of Basic and Diluted Common Shares Outstanding	Basic and diluted shares outstanding are summarized as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Weighted average number of basic shares outstanding 6,699 7,036 6,772 7,201 Effect of dilutive securities 96 91 113 85 Weighted average number of diluted shares outstanding 6,795 7,127 6,885 7,286

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	9 Months Ended
Fair Value Measurement (Tables)	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Summary of Investments Measured at Fair Value on Recurring Basis	The following table summarizes the Company’s investments at September 30, 2023 and December 31, 2022 measured at fair value on a recurring basis (in thousands): September 30, 2023 December 31, 2022 Gross Gross Unrealized Recorded Unrealized Recorded Cost Losses Basis Cost Losses Basis Current: Cash equivalents: U.S. treasuries $ 8,398 $ - $ 8,398 $ - $ - $ - Money market funds 1,502 - 1,502 40,296 - 40,296 Total cash equivalents 9,900 - 9,900 40,296 - 40,296 Investments: Corporate bonds 38,525 ( 5,088 ) 33,437 38,489 ( 5,181 ) 33,308 U.S. treasuries 16,690 ( 1,683 ) 15,007 - - - Asset backed securities 13,672 ( 341 ) 13,331 13,709 ( 737 ) 12,972 U.S. government agency securities 12,853 ( 635 ) 12,218 7,369 ( 302 ) 7,067 Mortgage backed securities 15,351 ( 3,676 ) 11,675 16,135 ( 3,139 ) 12,996 Emerging markets 2,014 ( 29 ) 1,985 2,044 ( 62 ) 1,982 Total current investments 99,105 ( 11,452 ) 87,653 77,746 ( 9,421 ) 68,325 Restricted cash and investments (1) : U.S. treasuries 83,064 ( 8,532 ) 74,532 66,479 ( 9,222 ) 57,257 Corporate bonds 82,708 ( 11,823 ) 70,885 81,993 ( 11,296 ) 70,697 Mortgage backed securities 43,389 ( 7,574 ) 35,815 46,138 ( 6,045 ) 40,093 U.S. government agency securities 16,872 ( 1,629 ) 15,243 26,479 ( 2,156 ) 24,323 Mutual funds 7,857 - 7,857 6,301 - 6,301 Asset backed securities 799 ( 9 ) 790 9 - 9 Money market funds 173 - 173 646 - 646 Total restricted cash and 234,862 ( 29,567 ) 205,295 228,045 ( 28,719 ) 199,326 Total investments $ 343,867 $ ( 41,019 ) $ 302,848 $ 346,087 $ ( 38,140 ) $ 307,947 (1) Included in restricted cash and investments within the condensed consolidated balance sheets is restricted cash of $ 2.1 million and $ 15.9 million as of September 30, 2023 and December 31, 2022 , respectively, which is excluded from the table above. Restricted cash and investments are classified as current and noncurrent on the balance sheet based on the nature of the restriction.
Summary of Assets Measured at Fair Value on Recurring Basis	The following table summarizes the Company’s investments at September 30, 2023 and December 31, 2022 measured at fair value on a recurring basis by fair value hierarchy level (in thousands): September 30, 2023 December 31, 2022 Total Total Recorded Recorded Basis Level 1 Level 2 Other (1) Basis Level 1 Level 2 Other (1) Cash equivalents: U.S. treasuries $ 8,398 $ - $ 8,398 $ - $ - $ - $ - $ - Money market 1,502 - - 1,502 40,296 - - 40,296 Investments: Corporate bonds 33,437 - 33,437 - 33,308 - 33,308 - U.S. treasuries 15,007 - 15,007 - - - - - Asset backed securities 13,331 - 13,331 - 12,972 - 12,972 - U.S. government 12,218 - 12,218 - 7,067 - 7,067 - Mortgage backed 11,675 - 11,675 - 12,996 - 12,996 - Emerging markets 1,985 - 1,985 - 1,982 - 1,982 - Restricted cash and U.S. treasuries 74,532 - 74,532 - 57,257 - 57,257 - Corporate bonds 70,885 - 70,885 - 70,697 - 70,697 - Mortgage backed 35,815 - 35,815 - 40,093 - 40,093 - U.S. government 15,243 - 15,243 - 24,323 - 24,323 - Mutual funds 7,857 7,857 - - 6,301 6,301 - - Asset backed securities 790 - 790 - 9 - 9 - Money market 173 - - 173 646 - - 646 Total investments $ 302,848 $ 7,857 $ 293,316 $ 1,675 $ 307,947 $ 6,301 $ 260,704 $ 40,942 (1) Investments in money market funds measured at fair value using the net asset value per share practical expedient are not subject to hierarchy level classification disclosure. The Company invests in money market funds that seek to maintain a stable net asset value. These investments include commingled funds that comprise high-quality short-term securities representing liquid debt and monetary instruments where the redemption value is likely to be the fair value. Redemption is permitted daily without written notice.
Summary of Contractual Maturities of Available for Sale Securities	The following table summarizes the contractual maturities of the Company’s available-for-sale securities at September 30, 2023 and December 31, 2022. Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties. The table also includes money market funds, which are classified as cash and cash equivalents on the Company’s consolidated balance sheets. September 30, 2023 (In thousands) Less than Between 1 to Between 5 to After 10 Years Total Corporate bonds $ 3,209 $ 65,749 $ 35,197 $ 167 $ 104,322 U.S. treasuries 42,587 26,839 28,511 - 97,937 U.S. government agency securities 38 25,448 1,975 - 27,461 Asset backed securities - 790 12,073 1,258 14,121 Emerging markets 1,985 - - - 1,985 Money market funds 1,675 - - - 1,675 Total $ 49,494 $ 118,826 $ 77,756 $ 1,425 $ 247,501 December 31, 2022 (In thousands) Less than Between 1 to Between 5 to After 10 Years Total Corporate bonds $ 646 $ 50,439 $ 52,920 $ - $ 104,005 U.S. treasuries 440 3,405 53,412 - 57,257 Money market funds 40,539 - - - 40,539 U.S. government agency securities 3,943 24,025 3,422 - 31,390 Asset backed securities - 9 2,113 10,859 12,981 Emerging markets - 1,982 - - 1,982 Total $ 45,568 $ 79,860 $ 111,867 $ 10,859 $ 248,154

Workers' Compensation Claims (T

Workers' Compensation Claims (Tables)	9 Months Ended
Workers' Compensation Claims (Tables)	Sep. 30, 2023
Text Block [Abstract]
Summarizes Aggregate Workers' Compensation Reserve Activity	The following table summarizes the aggregate workers’ compensation reserve activity (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Beginning balance Workers' compensation claims liabilities $ 191,823 $ 241,510 $ 215,987 $ 279,407 Add: claims expense accrual Current period 3,792 4,854 11,636 13,678 Prior periods ( 4,098 ) ( 1,360 ) ( 6,792 ) ( 10,737 ) ( 306 ) 3,494 4,844 2,941 Less: claim payments related to Current period 1,240 1,714 2,005 2,742 Prior periods 12,244 16,846 41,532 53,136 13,484 18,560 43,537 55,878 Change in claims incurred in excess of retention limits ( 231 ) 899 508 873 Ending balance Workers' compensation claims liabilities $ 177,802 $ 227,343 $ 177,802 $ 227,343 Incurred but not reported (IBNR) $ 82,076 $ 117,587 $ 82,076 $ 117,587 Ratio of IBNR to workers' compensation claims liabilities 46 % 52 % 46 % 52 %
Summary of Risk Retained by Insured Program after Considering Loss Portfolio Transfers and Current Insurance Arrangements	The following is a summary of the risk retained by the Company under its insured program after considering the effects of the loss portfolio transfers and current insurance arrangements: Year Claims risk retained 2014 No 2015 No 2016 No 2017 No 2018 (1) No 2019 (1) Yes 2020 Yes 2021 - Through June 30 Yes 2021 - July 1 and after No 2022 No 2023 No (1) LPT 2 excluded approximately 10 % of claims from 2018 and included an approximately offsetting amount of claims from 2019.

Basis of Presentation of Inte_4

Basis of Presentation of Interim Period Statements - Additional Information (Detail)		9 Months Ended
	Dec. 31, 2022 USD ($)	Sep. 30, 2023 USD ($) Company	Sep. 30, 2022 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue recognition professional employer service contracts term		1 year
Professional employer service contract cancellation and termination period		30 days
Payment term for staffing customers		30 days
Number of wholly-owned insurance companies \| Company		2
Cash and cash equivalents, maturity term		3 months
Allowance for doubtful accounts	$ 893,000	$ 885,000
Estimate of liability for unpaid safety incentives	2,000,000	1,500,000
Income taxes paid		$ 13,000,000	$ 12,200,000
Prior period reclassification adjustment	$ 18,900,000		$ 10,000,000

Basis of Presentation of Inte_5

Basis of Presentation of Interim Period Statements - Schedule of Reconciles of Cash, Cash Equivalents and Restricted Cash Balances (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 41,579	$ 91,423	$ 58,951	$ 69,405
Restricted cash, included in restricted cash and investments	20,857	15,955	9,067	9,224
Total cash, cash equivalents and restricted cash shown in the statements of cash flows	$ 62,436	$ 107,378	$ 68,018	$ 78,629

Basis of Presentation of Inte_6

Basis of Presentation of Interim Period Statements - Summary of Basic and Diluted Common Shares Outstanding (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average number of basic shares outstanding	6,699	7,036	6,772	7,201
Effect of dilutive securities	96	91	113	85
Weighted average number of diluted shares outstanding	6,795	7,127	6,885	7,286

Fair Value Measurement - Summar

Fair Value Measurement - Summary of Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	$ 343,867	$ 346,087
Gross Unrealized Gains (Losses)	(41,019)	(38,140)
Recorded Basis	302,848	307,947
Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	99,105	77,746
Gross Unrealized Gains (Losses)	(11,452)	(9,421)
Recorded Basis	87,653	68,325
Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	234,862	228,045
Gross Unrealized Gains (Losses)	(29,567)	(28,719)
Recorded Basis	205,295	199,326
U.S. Treasuries [Member] \| Cash and Cash Equivalents [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	8,398
Recorded Basis	8,398
U.S. Treasuries [Member] \| Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	16,690
Gross Unrealized Gains (Losses)	(1,683)
Recorded Basis	15,007
U.S. Treasuries [Member] \| Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	83,064	66,479
Gross Unrealized Gains (Losses)	(8,532)	(9,222)
Recorded Basis	74,532	57,257
Money Market Funds [Member] \| Cash and Cash Equivalents [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	1,502	40,296
Recorded Basis	1,502	40,296
Money Market Funds [Member] \| Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	173	646
Recorded Basis	173	646
Corporate Bonds [Member] \| Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	38,525	38,489
Gross Unrealized Gains (Losses)	(5,088)	(5,181)
Recorded Basis	33,437	33,308
Corporate Bonds [Member] \| Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	82,708	81,993
Gross Unrealized Gains (Losses)	(11,823)	(11,296)
Recorded Basis	70,885	70,697
Asset Backed Securities [Member] \| Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	13,672	13,709
Gross Unrealized Gains (Losses)	(341)	(737)
Recorded Basis	13,331	12,972
Asset Backed Securities [Member] \| Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	799	9
Gross Unrealized Gains (Losses)	(9)
Recorded Basis	790	9
Mortgage Backed Securities [Member] \| Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	15,351	16,135
Gross Unrealized Gains (Losses)	(3,676)	(3,139)
Recorded Basis	11,675	12,996
Mortgage Backed Securities [Member] \| Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	43,389	46,138
Gross Unrealized Gains (Losses)	(7,574)	(6,045)
Recorded Basis	35,815	40,093
U.S. Government Agency Securities [Member] \| Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	12,853	7,369
Gross Unrealized Gains (Losses)	(635)	(302)
Recorded Basis	12,218	7,067
U.S. Government Agency Securities [Member] \| Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	16,872	26,479
Gross Unrealized Gains (Losses)	(1,629)	(2,156)
Recorded Basis	15,243	24,323
Emerging Markets [Member] \| Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	2,014	2,044
Gross Unrealized Gains (Losses)	(29)	(62)
Recorded Basis	1,985	1,982
Mutual Funds [Member] \| Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	7,857	6,301
Recorded Basis	7,857	6,301
Marketable Securities Current [Member] \| Cash and Cash Equivalents [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	9,900	40,296
Recorded Basis	$ 9,900	$ 40,296

Fair Value Measurement - Summ_2

Fair Value Measurement - Summary of Investments Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Restricted cash	$ 2.1	$ 15.9

Fair Value Measurement - Summ_3

Fair Value Measurement - Summary of Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	$ 302,848	$ 307,947
Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	1,675	40,942
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	7,857	6,301
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	293,316	260,704
Cash and Cash Equivalents [Member] \| U.S. Treasuries [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	8,398
Cash and Cash Equivalents [Member] \| U.S. Treasuries [Member] \| Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	8,398
Cash and Cash Equivalents [Member] \| Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	1,502	40,296
Cash and Cash Equivalents [Member] \| Money Market Funds [Member] \| Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	1,502	40,296
Investments [Member] \| U.S. Treasuries [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	15,007
Investments [Member] \| U.S. Treasuries [Member] \| Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	15,007
Investments [Member] \| Corporate Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	33,437	33,308
Investments [Member] \| Corporate Bonds [Member] \| Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	33,437	33,308
Investments [Member] \| Mortgage Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	11,675	12,996
Investments [Member] \| Mortgage Backed Securities [Member] \| Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	11,675	12,996
Investments [Member] \| U.S. Government Agency Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	12,218	7,067
Investments [Member] \| U.S. Government Agency Securities [Member] \| Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	12,218	7,067
Investments [Member] \| Emerging Markets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	1,985	1,982
Investments [Member] \| Emerging Markets [Member] \| Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	1,985	1,982
Investments [Member] \| Asset Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	13,331	12,972
Investments [Member] \| Asset Backed Securities [Member] \| Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	13,331	12,972
Restricted Cash and Investments [Member] \| U.S. Treasuries [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	74,532	57,257
Restricted Cash and Investments [Member] \| U.S. Treasuries [Member] \| Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	74,532	57,257
Restricted Cash and Investments [Member] \| Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	173	646
Restricted Cash and Investments [Member] \| Money Market Funds [Member] \| Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	173	646
Restricted Cash and Investments [Member] \| Corporate Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	70,885	70,697
Restricted Cash and Investments [Member] \| Corporate Bonds [Member] \| Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	70,885	70,697
Restricted Cash and Investments [Member] \| Mortgage Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	35,815	40,093
Restricted Cash and Investments [Member] \| Mortgage Backed Securities [Member] \| Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	35,815	40,093
Restricted Cash and Investments [Member] \| U.S. Government Agency Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	15,243	24,323
Restricted Cash and Investments [Member] \| U.S. Government Agency Securities [Member] \| Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	15,243	24,323
Restricted Cash and Investments [Member] \| Asset Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	790	9
Restricted Cash and Investments [Member] \| Asset Backed Securities [Member] \| Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	790	9
Restricted Cash and Investments [Member] \| Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	7,857	6,301
Restricted Cash and Investments [Member] \| Mutual Funds [Member] \| Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	$ 7,857	$ 6,301

Fair Value Measurement - Summ_4

Fair Value Measurement - Summary of Contractual Maturities of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	$ 49,494	$ 45,568
Available for sale securities, contractual maturities between 1 to 5 years	118,826	79,860
Available for sale securities, contractual maturities between 5 to 10 years	77,756	111,867
Available for sale securities, contractual maturities after 10 years	1,425	10,859
Available for sale securities, contractual maturities, Total	247,501	248,154
Corporate Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	3,209	646
Available for sale securities, contractual maturities between 1 to 5 years	65,749	50,439
Available for sale securities, contractual maturities between 5 to 10 years	35,197	52,920
Available for sale securities, contractual maturities after 10 years	167
Available for sale securities, contractual maturities, Total	104,322	104,005
U.S. Treasuries [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	42,587	440
Available for sale securities, contractual maturities between 1 to 5 years	26,839	3,405
Available for sale securities, contractual maturities between 5 to 10 years	28,511	53,412
Available for sale securities, contractual maturities, Total	97,937	57,257
U.S. Government Agency Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	38	3,943
Available for sale securities, contractual maturities between 1 to 5 years	25,448	24,025
Available for sale securities, contractual maturities between 5 to 10 years	1,975	3,422
Available for sale securities, contractual maturities, Total	27,461	31,390
Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	1,675	40,539
Available for sale securities, contractual maturities, Total	1,675	40,539
Emerging Markets [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	1,985
Available for sale securities, contractual maturities between 1 to 5 years		1,982
Available for sale securities, contractual maturities, Total	1,985	1,982
Asset Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities between 1 to 5 years	790	9
Available for sale securities, contractual maturities between 5 to 10 years	12,073	2,113
Available for sale securities, contractual maturities after 10 years	1,258	10,859
Available for sale securities, contractual maturities, Total	$ 14,121	$ 12,981

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail)	9 Months Ended	12 Months Ended
Fair Value Measurement - Additional Information (Detail)	Sep. 30, 2023	Dec. 31, 2022
Mortgage Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Average contractual maturity period	23 years	24 years

Workers' Compensation Claims -

Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Workers Compensation Reserve [Abstract]
Workers' compensation claims liabilities, Beginning balance	$ 191,823	$ 241,510	$ 215,987	$ 279,407
Add: claims expense accrual
Current period	3,792	4,854	11,636	13,678
Prior periods	(4,098)	(1,360)	(6,792)	(10,737)
Total expense accrual	(306)	3,494	4,844	2,941
Less: claim payments related to
Current period	1,240	1,714	2,005	2,742
Prior periods	12,244	16,846	41,532	53,136
Total paid	13,484	18,560	43,537	55,878
Change in claims incurred in excess of retention limits	(231)	899	508	873
Workers' compensation claims liabilities, Ending balance	177,802	227,343	177,802	227,343
Incurred but not reported (IBNR)	$ 82,076	$ 117,587	$ 82,076	$ 117,587
Ratio of IBNR to workers' compensation claims liabilities	46%	52%	46%	52%

Workers' Compensation Claims _2

Workers' Compensation Claims - Additional Information (Detail) - USD ($)			6 Months Ended	9 Months Ended	12 Months Ended
	Jul. 01, 2021	Jun. 29, 2020	Jun. 30, 2020	Sep. 30, 2023	Dec. 31, 2022	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Description of renewed agreement				Effective July 1, 2021, the Company entered into a new arrangement for its insured program, whereby third-party insurers assumed all risk of loss for claims incurred from July 1, 2021 to June 30, 2022 (the “2021-2022 Policy”). The arrangement for the insured program was renewed for claims incurred from July 1, 2022 to June 30, 2023 (the “2022-2023 Policy”) and for claims incurred from July 1, 2023 to June 30, 2024 (the “2023-2024 Policy”).
Balance in Chubb trust accounts				$ 178,700,000	$ 188,200,000
Workers compensation liability				177,802,000	215,987,000	$ 191,823,000	$ 227,343,000	$ 241,510,000	$ 279,407,000
Collateral securities maintain to cover potential workers compensation claims losses				48,100,000	54,500,000
Surety bonds and standby letters of credit				48,100,000
Reserves incurred in excess of retention limits				3,500,000	3,000,000
Other Assets [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrual for costs incurred in excess of retention limits offset by a receivable				3,500,000	$ 3,000,000
California [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Surety bonds and standby letters of credit				17,200,000
2021-2022 Policy [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum savings amount for twelve month policy period, if claims develop favorably				20,000,000
Maximum additional premium charged amount for twelve month policy period, if claims develop adversely				7,500,000
2022-2023 Policy [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum savings amount for twelve month policy period, if claims develop favorably				22,500,000
Maximum additional premium charged amount for twelve month policy period, if claims develop adversely				0
2023-2024 Policy [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum savings amount for twelve month policy period, if claims develop favorably				28,500,000
Maximum additional premium charged amount for twelve month policy period, if claims develop adversely				$ 0
Self Insured Programs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of worker's compensation exposure covered				16%
Worker's compensation risk claim maximum			$ 5,000,000	$ 3,000,000
Self Insured Programs [Member] \| Maryland [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reinsurance coverage			1,000,000	1,000,000
Self Insured Programs [Member] \| Colorado [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reinsurance coverage			$ 2,000,000	$ 2,000,000
Insured Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of worker's compensation exposure covered				84%
Worker's compensation risk claim maximum	$ 3,000,000
Worker's compensation risk claim maximum		$ 5,000,000

Worker's Compensation Claims -

Worker's Compensation Claims - Summary of Risk Retained by Insured Program after Considering Loss Portfolio Transfers and Current Insurance Arrangements (Details)	9 Months Ended
	Sep. 30, 2023
2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	Yes
2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	Yes
2021 - Through June 30 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	Yes
2021 - July 1 and After [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2022 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2023 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No

Worker's Compensation Claims _2

Worker's Compensation Claims - Summary of Risk Retained by Insured Program after Considering Loss Portfolio Transfers and Current Insurance Arrangements (Parenthetical) (Details)	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Percentage of claim excluded	10%

Revolving Credit Facility and_2

Revolving Credit Facility and Long-Term Debt - Additional Information (Detail) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2023
Line of Credit Facility [Line Items]
Line of credit facility commitment fee description					The Agreement also provides for an unused commitment fee of 0.35% per year on the average daily unused amount of the revolving credit line, as well as a fee of 1.75% of the face amount of each letter of credit reserved under the line of credit.
Minimum [Member]
Line of Credit Facility [Line Items]
Tangible net worth amount	$ 50,000,000	$ 50,000,000	$ 50,000,000	$ 50,000,000
Revolving Credit Facility [Member] \| SOFR [Member]
Line of Credit Facility [Line Items]
Term loan from bank interest rate description					the daily Simple Secured Overnight Financing Rate (“SOFR”) plus 1.75% or (b) one-month Term SOFR plus 1.75%.
Revolving Credit Facility [Member] \| One-Month Term SOFR [Member]
Line of Credit Facility [Line Items]
Term loan from bank interest rate description					one-month Term SOFR plus 1.75
SOFR plus rate					1.75%
Agreement [Member]
Line of Credit Facility [Line Items]
Outstanding balance on term loan and revolving credit facility	0			0	$ 0
Dividends or distributions paid					0
Maximum amount to redeem retire repurchase or acquire stock upon agreement					15,000,000
Agreement [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
EBITDA	10,000,000	$ 10,000,000	$ 10,000,000	$ 10,000,000	10,000,000
Agreement [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Prohibition on incurring additional indebtedness without the prior approval of the Bank in purchase money financing					1,000,000
Agreement [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility borrowing capacity	50,000,000				$ 50,000,000
Unused commitment fee on unused amount during period					0.35%
Agreement [Member] \| Revolving Credit Facility [Member] \| SOFR [Member]
Line of Credit Facility [Line Items]
SOFR plus rate					1.75%
Agreement [Member] \| Standby Letters of Credit [Member]
Line of Credit Facility [Line Items]
Credit facility borrowing capacity	$ 25,000,000				$ 25,000,000
Agreement [Member] \| Line of Credit [Member]
Line of Credit Facility [Line Items]
Unused commitment fee on unused amount					1.75%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended	48 Months Ended
Income Taxes - Additional Information (Detail) - USD ($)	Sep. 30, 2023	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2022
Income Tax Contingency [Line Items]
Income tax examination estimated penalty			$ 1,700,000
Gross unrecognized tax benefits				$ 600,000
Operating loss carryforward	$ 0
Federal General Business Tax Credit Carry Forward [Member]
Income Tax Contingency [Line Items]
Tax credit carryforwards	0
Alternative Minimum Tax Credit Carry Forward [Member]
Income Tax Contingency [Line Items]
Tax credit carryforwards	$ 0
Internal Revenue Service [Member]
Income Tax Contingency [Line Items]
Wage based tax credits claimed amount to be disallowed results estimated additional tax due		$ 600,000	$ 7,400,000
Internal Revenue Service [Member] \| Minimum [Member]
Income Tax Contingency [Line Items]
Ongoing audit for tax years	2017
Internal Revenue Service [Member] \| Minimum [Member] \| Wage Based Tax Credits [Member]
Income Tax Contingency [Line Items]
Ongoing audit for tax years	2017
Internal Revenue Service [Member] \| Maximum [Member]
Income Tax Contingency [Line Items]
Ongoing audit for tax years	2021
Internal Revenue Service [Member] \| Maximum [Member] \| Wage Based Tax Credits [Member]
Income Tax Contingency [Line Items]
Ongoing audit for tax years	2020

Litigation - Additional Informa

Litigation - Additional Information (Detail) $ in Millions	Sep. 30, 2023 USD ($)
Accrued Liabilities [Member]
Loss Contingencies [Line Items]
Estimated liability	$ 0.2