| Cover | Sep. 11, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Sep. 11, 2024 |
| Entity Registrant Name | INSIGHT ENTERPRISES, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 0-25092 |
| Entity Tax Identification Number | 86-0766246 |
| Entity Address, Address Line One | 2701 East Insight Way, |
| Entity Address, City or Town | Chandler, |
| Entity Address, State or Province | AZ |
| Entity Address, Postal Zip Code | 85286 |
| City Area Code | 480 |
| Local Phone Number | 333-3000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.01 |
| Trading Symbol | NSIT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000932696 |
| Amendment Flag | false |
