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Segment Information - Summary of Revenue Disaggregated by Reportable Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Disaggregation of Revenue	$ 2,447,521	$ 1,936,478	$ 6,870,090	$ 6,049,264
Hardware Net Sales [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	1,592,495	1,173,151	4,258,464	3,668,411
Software Net Sales [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	531,744	488,417	1,647,973	1,514,406
Services Net Sales [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	323,282	274,910	963,653	866,447
Gross Revenue Recognition (Principal) [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	2,324,889	1,829,417	6,484,916	5,710,135
Net Revenue Recognition (Agent) [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	122,632	107,061	385,174	339,129
North America Segment [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	2,019,876	1,558,168	5,434,286	4,771,696
North America Segment [Member] | Hardware Net Sales [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	1,418,335	1,028,045	3,696,594	3,180,501
North America Segment [Member] | Software Net Sales [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	338,440	306,925	978,987	898,290
North America Segment [Member] | Services Net Sales [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	263,101	223,198	758,705	692,905
North America Segment [Member] | Gross Revenue Recognition (Principal) [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	1,926,059	1,477,716	5,157,086	4,530,152
North America Segment [Member] | Net Revenue Recognition (Agent) [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	93,817	80,452	277,200	241,544
EMEA Segment [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	381,448	341,280	1,277,658	1,152,183
EMEA Segment [Member] | Hardware Net Sales [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	160,645	138,685	527,022	466,909
EMEA Segment [Member] | Software Net Sales [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	178,868	165,301	598,277	553,164
EMEA Segment [Member] | Services Net Sales [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	41,935	37,294	152,359	132,110
EMEA Segment [Member] | Gross Revenue Recognition (Principal) [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	358,981	320,445	1,190,283	1,071,910
EMEA Segment [Member] | Net Revenue Recognition (Agent) [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	22,467	20,835	87,375	80,273
APAC Segment [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	46,197	37,030	158,146	125,385
APAC Segment [Member] | Hardware Net Sales [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	13,515	6,421	34,848	21,001
APAC Segment [Member] | Software Net Sales [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	14,436	16,191	70,709	62,952
APAC Segment [Member] | Services Net Sales [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	18,246	14,418	52,589	41,432
APAC Segment [Member] | Gross Revenue Recognition (Principal) [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	39,849	31,256	137,547	108,073
APAC Segment [Member] | Net Revenue Recognition (Agent) [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	6,348	5,774	20,599	17,312
Large Enterprise / Corporate [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	1,745,485	1,301,644	4,788,357	4,080,516
Large Enterprise / Corporate [Member] | North America Segment [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	1,447,246	1,043,303	3,838,627	3,227,613
Large Enterprise / Corporate [Member] | EMEA Segment [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	276,292	242,925	883,044	808,360
Large Enterprise / Corporate [Member] | APAC Segment [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	21,947	15,416	66,686	44,543
Commercial [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	414,944	341,924	1,188,209	1,120,520
Commercial [Member] | North America Segment [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	384,458	312,080	1,091,247	1,030,540
Commercial [Member] | EMEA Segment [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	13,209	13,647	50,908	44,567
Commercial [Member] | APAC Segment [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	17,277	16,197	46,054	45,413
Public Sector [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	287,092	292,910	893,524	848,228
Public Sector [Member] | North America Segment [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	188,172	202,785	504,412	513,543
Public Sector [Member] | EMEA Segment [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	91,947	84,708	343,706	299,256
Public Sector [Member] | APAC Segment [Member]
Segment Reporting Information [Line Items]
Disaggregation of Revenue	$ 6,973	$ 5,417	$ 45,406	$ 35,429

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