Segment Information - Financial Information about Reportable Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total net sales	$ 1,936,478	$ 1,912,547	$ 6,049,264	$ 5,434,034
Total costs of goods sold	1,628,915	1,636,352	5,091,976	4,633,918
Gross profit	307,563	276,195	957,288	800,116
Operating expenses:
Selling and administrative expenses	245,155	223,215	756,598	613,767
Severance and restructuring expenses	808	2,662	9,962	3,712
Acquisition and integration related expenses	118	5,896	2,195	9,059
Earnings from operations	61,482	44,422	188,533	173,578
Products [Member]
Segment Reporting Information [Line Items]
Total net sales	1,661,568	1,668,880	5,182,817	4,729,887
Total costs of goods sold	1,500,312	1,519,240	4,688,497	4,315,464
Services [Member]
Segment Reporting Information [Line Items]
Total net sales	274,910	243,667	866,447	704,147
Total costs of goods sold	128,603	117,112	403,479	318,454
North America Segment [Member]
Segment Reporting Information [Line Items]
Total net sales	1,558,168	1,515,162	4,771,696	4,163,110
Total costs of goods sold	1,311,000	1,296,518	4,022,704	3,562,800
Gross profit	247,168	218,644	748,992	600,310
Operating expenses:
Selling and administrative expenses	192,033	170,993	590,549	452,441
Severance and restructuring expenses	773	2,449	7,799	3,260
Acquisition and integration related expenses	118	5,896	1,991	9,059
Earnings from operations	54,244	39,306	148,653	135,550
North America Segment [Member] | Products [Member]
Segment Reporting Information [Line Items]
Total net sales	1,334,970	1,315,813	4,078,791	3,611,895
Total costs of goods sold	1,202,743	1,195,020	3,678,118	3,290,555
North America Segment [Member] | Services [Member]
Segment Reporting Information [Line Items]
Total net sales	223,198	199,349	692,905	551,215
Total costs of goods sold	108,257	101,498	344,586	272,245
EMEA Segment [Member]
Segment Reporting Information [Line Items]
Total net sales	341,280	355,708	1,152,183	1,125,057
Total costs of goods sold	290,980	307,817	974,929	955,733
Gross profit	50,300	47,891	177,254	169,324
Operating expenses:
Selling and administrative expenses	45,438	44,568	143,859	139,365
Severance and restructuring expenses	19	213	2,118	328
Acquisition and integration related expenses			204
Earnings from operations	4,843	3,110	31,073	29,631
EMEA Segment [Member] | Products [Member]
Segment Reporting Information [Line Items]
Total net sales	303,986	324,255	1,020,073	1,011,965
Total costs of goods sold	277,025	297,789	933,053	926,712
EMEA Segment [Member] | Services [Member]
Segment Reporting Information [Line Items]
Total net sales	37,294	31,453	132,110	113,092
Total costs of goods sold	13,955	10,028	41,876	29,021
APAC Segment [Member]
Segment Reporting Information [Line Items]
Total net sales	37,030	41,677	125,385	145,867
Total costs of goods sold	26,935	32,017	94,343	115,385
Gross profit	10,095	9,660	31,042	30,482
Operating expenses:
Selling and administrative expenses	7,684	7,654	22,190	21,961
Severance and restructuring expenses	16		45	124
Earnings from operations	2,395	2,006	8,807	8,397
APAC Segment [Member] | Products [Member]
Segment Reporting Information [Line Items]
Total net sales	22,612	28,812	83,953	106,027
Total costs of goods sold	20,544	26,431	77,326	98,197
APAC Segment [Member] | Services [Member]
Segment Reporting Information [Line Items]
Total net sales	14,418	12,865	41,432	39,840
Total costs of goods sold	$ 6,391	$ 5,586	$ 17,017	$ 17,188