Acquisitions - Summary of Estimated Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Sep. 19, 2019 | Aug. 08, 2019 | Jun. 18, 2019 | Jan. 02, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 |
Business Acquisition [Line Items] | | | | | | | |
Goodwill | | | | | $ 2,967,383 | | $ 2,950,587 |
Cash paid for acquisitions | | | | | 15,000 | $ 108,872 | |
Nexstar Stations | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Cash | $ 0 | | | | | | |
Accounts receivable | 34,680 | | | | | | |
Prepaid and other current assets | 3,776 | | | | | | |
Property and equipment | 45,186 | | | | | | |
Goodwill | 126,928 | | | | | | |
Right-of-use assets for operating leases | 22,715 | | | | | | |
Other noncurrent assets | 237 | | | | | | |
Total assets acquired | 800,033 | | | | | | |
Accounts Payable | 2,037 | | | | | | |
Accrued liabilities | 8,122 | | | | | | |
Deferred income tax liability | 0 | | | | | | |
Operating lease liabilities - noncurrent | 20,346 | | | | | | |
Other noncurrent liabilities | 426 | | | | | | |
Total liabilities assumed | 30,931 | | | | | | |
Net assets acquired | 769,102 | | | | | | |
Less: cash acquired | 0 | | | | | | |
Less: fair value of existing ownership | 0 | | | | | | |
Cash paid for acquisitions | 769,102 | | | | | | |
Dispatch Stations | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Cash | | $ 2,363 | | | | | |
Accounts receivable | | 26,344 | | | | | |
Prepaid and other current assets | | 6,092 | | | | | |
Property and equipment | | 40,418 | | | | | |
Goodwill | | 202,274 | | | | | |
Right-of-use assets for operating leases | | 362 | | | | | |
Other noncurrent assets | | 0 | | | | | |
Total assets acquired | | 667,708 | | | | | |
Accounts Payable | | 954 | | | | | |
Accrued liabilities | | 9,011 | | | | | |
Deferred income tax liability | | 97,044 | | | | | |
Operating lease liabilities - noncurrent | | 226 | | | | | |
Other noncurrent liabilities | | 0 | | | | | |
Total liabilities assumed | | 107,235 | | | | | |
Net assets acquired | | 560,473 | | | | | |
Less: cash acquired | | (2,363) | | | | | |
Less: fair value of existing ownership | | 0 | | | | | |
Cash paid for acquisitions | | 558,110 | | | | | |
Justice & Quest | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Cash | | | $ 0 | | | | |
Accounts receivable | | | 8,501 | | | | |
Prepaid and other current assets | | | 6,987 | | | | |
Property and equipment | | | 361 | | | | |
Goodwill | | | 23,558 | | | | |
Right-of-use assets for operating leases | | | 0 | | | | |
Other noncurrent assets | | | 5,253 | | | | |
Total assets acquired | | | 97,213 | | | | |
Accounts Payable | | | 725 | | | | |
Accrued liabilities | | | 4,236 | | | | |
Deferred income tax liability | | | (471) | | | | |
Operating lease liabilities - noncurrent | | | 0 | | | | |
Other noncurrent liabilities | | | 2,677 | | | | |
Total liabilities assumed | | | 7,167 | | | | |
Net assets acquired | | | 90,046 | | | | |
Less: cash acquired | | | 0 | | | | |
Less: fair value of existing ownership | | | (12,995) | | | | |
Cash paid for acquisitions | | | 77,051 | | | | |
Gray Stations | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Cash | | | | $ 0 | | | |
Accounts receivable | | | | 5,553 | | | |
Prepaid and other current assets | | | | 987 | | | |
Property and equipment | | | | 11,757 | | | |
Goodwill | | | | 19,405 | | | |
Right-of-use assets for operating leases | | | | 251 | | | |
Other noncurrent assets | | | | 18 | | | |
Total assets acquired | | | | 111,650 | | | |
Accounts Payable | | | | 1 | | | |
Accrued liabilities | | | | 1,494 | | | |
Deferred income tax liability | | | | 0 | | | |
Operating lease liabilities - noncurrent | | | | 235 | | | |
Other noncurrent liabilities | | | | 0 | | | |
Total liabilities assumed | | | | 1,730 | | | |
Net assets acquired | | | | 109,920 | | | |
Less: cash acquired | | | | 0 | | | |
Less: fair value of existing ownership | | | | 0 | | | |
Cash paid for acquisitions | | | | 109,920 | | | |
Recent Acquisitions | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Cash | | | | | 2,363 | | |
Accounts receivable | | | | | 75,078 | | |
Prepaid and other current assets | | | | | 17,842 | | |
Property and equipment | | | | | 97,722 | | |
Goodwill | | | | | 372,165 | | |
Right-of-use assets for operating leases | | | | | 23,328 | | |
Other noncurrent assets | | | | | 5,508 | | |
Total assets acquired | | | | | 1,676,604 | | |
Accounts Payable | | | | | 3,717 | | |
Accrued liabilities | | | | | 22,863 | | |
Deferred income tax liability | | | | | 96,573 | | |
Operating lease liabilities - noncurrent | | | | | 20,807 | | |
Other noncurrent liabilities | | | | | 3,103 | | |
Total liabilities assumed | | | | | 147,063 | | |
Net assets acquired | | | | | 1,529,541 | | |
Less: cash acquired | | | | | (2,363) | | |
Less: fair value of existing ownership | | | | | (12,995) | | |
Cash paid for acquisitions | | | | | 1,514,183 | | |
Network affiliation agreements | Nexstar Stations | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | 123,926 | | | | | | |
Network affiliation agreements | Dispatch Stations | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | 60,765 | | | | | |
Network affiliation agreements | Justice & Quest | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | | 0 | | | | |
Network affiliation agreements | Gray Stations | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | | | 14,420 | | | |
Network affiliation agreements | Recent Acquisitions | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | | | | 199,111 | | |
Retransmission agreements | Nexstar Stations | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | 68,316 | | | | | | |
Retransmission agreements | Dispatch Stations | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | 33,107 | | | | | |
Retransmission agreements | Justice & Quest | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | | 0 | | | | |
Retransmission agreements | Gray Stations | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | | | 12,198 | | | |
Retransmission agreements | Recent Acquisitions | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | | | | 113,621 | | |
Other intangible assets | Nexstar Stations | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | 0 | | | | | | |
Other intangible assets | Dispatch Stations | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | 0 | | | | | |
Other intangible assets | Justice & Quest | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | | 52,553 | | | | |
Other intangible assets | Gray Stations | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | | | 0 | | | |
Other intangible assets | Recent Acquisitions | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | | | | 52,553 | | |
FCC licenses | Nexstar Stations | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | $ 374,269 | | | | | | |
FCC licenses | Dispatch Stations | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | $ 295,983 | | | | | |
FCC licenses | Justice & Quest | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | | $ 0 | | | | |
FCC licenses | Gray Stations | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | | | $ 47,061 | | | |
FCC licenses | Recent Acquisitions | | | | | | | |
Business Acquisition [Line Items] | | | | | | | |
Intangible assets acquired | | | | | $ 717,313 | | |