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Cover - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 11, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 0-25092    
Entity Registrant Name INSIGHT ENTERPRISES, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 86-0766246    
Entity Address, Address Line One 6820 South Harl Avenue    
Entity Address, City or Town Tempe    
Entity Address, State or Province AZ    
Entity Address, Postal Zip Code 85283    
City Area Code 480    
Local Phone Number 333-3000    
Title of 12(b) Security Common stock, par value $0.01    
Trading Symbol NSIT    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 3,484,880,453
Entity Common Stock, Shares Outstanding   34,896,501  
Documents Incorporated by Reference DOCUMENTS INCORPORATED BY REFERENCEPortions of the registrant’s Proxy Statement relating to its 2022 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission within 120 days after December 31, 2021 have been incorporated by reference into Part III, Items 10, 11, 12, 13 and 14 of this Annual Report on Form 10-K.    
Entity Central Index Key 0000932696    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false