Segment Information - Schedule of Revenue from External Customers and Identifiable Assets, by Geographical Areas (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net Revenue	$ 687,235	$ 626,481	$ 757,938	$ 754,698	$ 678,808	$ 624,859	$ 717,180	$ 623,464	$ 2,826,352	$ 2,644,311	$ 2,333,371
Operating Income	156,317	$ 138,681	$ 199,940	$ 185,828	358,536	$ 144,212	$ 172,501	$ 150,197	680,766	825,446	517,461
Identifiable Assets	4,997,241				4,928,677				4,997,241	4,928,677	4,556,508
Americas [Member]
Segment Reporting Information [Line Items]
Net Revenue									1,615,736	1,558,070	1,399,285
Operating Income									434,111	596,044	335,887
Identifiable Assets	2,557,904				2,600,412				2,557,904	2,600,412	3,015,267
EMEA [Member]
Segment Reporting Information [Line Items]
Net Revenue									1,022,994	903,525	795,932
Operating Income									206,578	193,781	168,745
Identifiable Assets	2,150,597				2,039,385				2,150,597	2,039,385	1,286,149
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net Revenue									187,622	182,716	138,154
Operating Income									40,077	35,621	12,829
Identifiable Assets	$ 288,740				$ 288,880				$ 288,740	$ 288,880	$ 255,092