Segment Information - Summary of Revenue Disaggregated by Reportable Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Total net sales	$ 2,003,845	$ 2,087,886	$ 6,198,883	$ 6,629,033
Gross revenue recognition (Principal)
Segment Reporting Information [Line Items]
Total net sales	1,811,546	1,912,281	5,645,626	6,071,996
Net revenue recognition (Agent)
Segment Reporting Information [Line Items]
Total net sales	192,299	175,605	553,257	557,037
North America
Segment Reporting Information [Line Items]
Total net sales	1,625,302	1,716,583	5,010,249	5,353,762
North America \| Gross revenue recognition (Principal)
Segment Reporting Information [Line Items]
Total net sales	1,481,867	1,575,767	4,602,892	4,924,449
North America \| Net revenue recognition (Agent)
Segment Reporting Information [Line Items]
Total net sales	143,435	140,816	407,357	429,313
EMEA
Segment Reporting Information [Line Items]
Total net sales	319,758	312,606	1,011,200	1,094,320
EMEA \| Gross revenue recognition (Principal)
Segment Reporting Information [Line Items]
Total net sales	280,907	287,389	891,920	997,597
EMEA \| Net revenue recognition (Agent)
Segment Reporting Information [Line Items]
Total net sales	38,851	25,217	119,280	96,723
APAC
Segment Reporting Information [Line Items]
Total net sales	58,785	58,697	177,434	180,951
APAC \| Gross revenue recognition (Principal)
Segment Reporting Information [Line Items]
Total net sales	48,772	49,125	150,814	149,950
APAC \| Net revenue recognition (Agent)
Segment Reporting Information [Line Items]
Total net sales	10,013	9,572	26,620	31,001
Large Enterprise / Corporate
Segment Reporting Information [Line Items]
Total net sales	1,347,713	1,416,374	4,189,195	4,599,189
Large Enterprise / Corporate \| North America
Segment Reporting Information [Line Items]
Total net sales	1,070,488	1,138,827	3,362,916	3,695,537
Large Enterprise / Corporate \| EMEA
Segment Reporting Information [Line Items]
Total net sales	254,686	252,445	762,019	832,515
Large Enterprise / Corporate \| APAC
Segment Reporting Information [Line Items]
Total net sales	22,539	25,102	64,260	71,137
Commercial
Segment Reporting Information [Line Items]
Total net sales	407,197	386,694	1,246,836	1,153,034
Commercial \| North America
Segment Reporting Information [Line Items]
Total net sales	380,775	360,833	1,164,922	1,078,062
Commercial \| EMEA
Segment Reporting Information [Line Items]
Total net sales	5,966	8,332	23,563	25,033
Commercial \| APAC
Segment Reporting Information [Line Items]
Total net sales	20,456	17,529	58,351	49,939
Public Sector
Segment Reporting Information [Line Items]
Total net sales	248,935	284,818	762,852	876,810
Public Sector \| North America
Segment Reporting Information [Line Items]
Total net sales	174,039	216,923	482,411	580,163
Public Sector \| EMEA
Segment Reporting Information [Line Items]
Total net sales	59,106	51,829	225,618	236,772
Public Sector \| APAC
Segment Reporting Information [Line Items]
Total net sales	15,790	16,066	54,823	59,875
Hardware
Segment Reporting Information [Line Items]
Total net sales	1,144,225	1,137,518	3,476,772	3,444,886
Hardware \| North America
Segment Reporting Information [Line Items]
Total net sales	1,021,930	1,002,000	3,102,128	3,030,589
Hardware \| EMEA
Segment Reporting Information [Line Items]
Total net sales	111,239	125,013	348,553	386,401
Hardware \| APAC
Segment Reporting Information [Line Items]
Total net sales	11,056	10,505	26,091	27,896
Software
Segment Reporting Information [Line Items]
Total net sales	433,547	536,261	1,474,090	1,919,283
Software \| North America
Segment Reporting Information [Line Items]
Total net sales	286,115	389,176	983,556	1,349,625
Software \| EMEA
Segment Reporting Information [Line Items]
Total net sales	126,509	124,629	416,685	495,063
Software \| APAC
Segment Reporting Information [Line Items]
Total net sales	20,923	22,456	73,849	74,595
Services
Segment Reporting Information [Line Items]
Total net sales	426,073	414,107	1,248,021	1,264,864
Services \| North America
Segment Reporting Information [Line Items]
Total net sales	317,257	325,407	924,565	973,548
Services \| EMEA
Segment Reporting Information [Line Items]
Total net sales	82,010	62,964	245,962	212,856
Services \| APAC
Segment Reporting Information [Line Items]
Total net sales	$ 26,806	$ 25,736	$ 77,494	$ 78,460

INSIGHT ENTERPRISES INC 10-Q