Segment Information - Summary of Revenue Disaggregated by Reportable Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Disaggregation of revenue	$ 2,650,850	$ 2,193,068
Hardware
Segment Reporting Information [Line Items]
Disaggregation of revenue	1,673,588	1,315,025
Software
Segment Reporting Information [Line Items]
Disaggregation of revenue	636,699	577,995
Services
Segment Reporting Information [Line Items]
Disaggregation of revenue	340,563	300,048
Gross revenue recognition (Principal)
Segment Reporting Information [Line Items]
Disaggregation of revenue	2,524,801	2,073,481
Net revenue recognition (Agent)
Segment Reporting Information [Line Items]
Disaggregation of revenue	126,049	119,587
North America
Segment Reporting Information [Line Items]
Disaggregation of revenue	2,064,505	1,654,781
North America | Hardware
Segment Reporting Information [Line Items]
Disaggregation of revenue	1,451,319	1,109,489
North America | Software
Segment Reporting Information [Line Items]
Disaggregation of revenue	341,547	308,738
North America | Services
Segment Reporting Information [Line Items]
Disaggregation of revenue	271,639	236,554
North America | Gross revenue recognition (Principal)
Segment Reporting Information [Line Items]
Disaggregation of revenue	1,970,921	1,569,641
North America | Net revenue recognition (Agent)
Segment Reporting Information [Line Items]
Disaggregation of revenue	93,584	85,140
EMEA
Segment Reporting Information [Line Items]
Disaggregation of revenue	531,433	478,836
EMEA | Hardware
Segment Reporting Information [Line Items]
Disaggregation of revenue	210,623	195,971
EMEA | Software
Segment Reporting Information [Line Items]
Disaggregation of revenue	272,402	234,423
EMEA | Services
Segment Reporting Information [Line Items]
Disaggregation of revenue	48,408	48,442
EMEA | Gross revenue recognition (Principal)
Segment Reporting Information [Line Items]
Disaggregation of revenue	506,862	450,977
EMEA | Net revenue recognition (Agent)
Segment Reporting Information [Line Items]
Disaggregation of revenue	24,571	27,859
APAC
Segment Reporting Information [Line Items]
Disaggregation of revenue	54,912	59,451
APAC | Hardware
Segment Reporting Information [Line Items]
Disaggregation of revenue	11,646	9,565
APAC | Software
Segment Reporting Information [Line Items]
Disaggregation of revenue	22,750	34,834
APAC | Services
Segment Reporting Information [Line Items]
Disaggregation of revenue	20,516	15,052
APAC | Gross revenue recognition (Principal)
Segment Reporting Information [Line Items]
Disaggregation of revenue	47,018	52,863
APAC | Net revenue recognition (Agent)
Segment Reporting Information [Line Items]
Disaggregation of revenue	7,894	6,588
Large Enterprise / Corporate
Segment Reporting Information [Line Items]
Disaggregation of revenue	1,814,062	1,499,579
Large Enterprise / Corporate | North America
Segment Reporting Information [Line Items]
Disaggregation of revenue	1,438,729	1,171,428
Large Enterprise / Corporate | EMEA
Segment Reporting Information [Line Items]
Disaggregation of revenue	353,904	309,075
Large Enterprise / Corporate | APAC
Segment Reporting Information [Line Items]
Disaggregation of revenue	21,429	19,076
Commercial
Segment Reporting Information [Line Items]
Disaggregation of revenue	474,239	377,245
Commercial | North America
Segment Reporting Information [Line Items]
Disaggregation of revenue	441,159	344,045
Commercial | EMEA
Segment Reporting Information [Line Items]
Disaggregation of revenue	18,421	20,533
Commercial | APAC
Segment Reporting Information [Line Items]
Disaggregation of revenue	14,659	12,667
Public Sector
Segment Reporting Information [Line Items]
Disaggregation of revenue	362,549	316,244
Public Sector | North America
Segment Reporting Information [Line Items]
Disaggregation of revenue	184,617	139,308
Public Sector | EMEA
Segment Reporting Information [Line Items]
Disaggregation of revenue	159,108	149,228
Public Sector | APAC
Segment Reporting Information [Line Items]
Disaggregation of revenue	$ 18,824	$ 27,708