Segment Information - Segment Disclosures (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 1,152,261	$ 924,676	$ 3,168,207	$ 2,669,342
Total depreciation and amortization	278,411	214,825	750,203	627,410
Capital expenditures	320,234	279,477	946,048	727,044
Americas [Member]
Segment Reporting Information [Line Items]
Total revenues	596,538	425,142	1,566,593	1,243,007
Total depreciation and amortization	151,072	81,724	363,341	236,385
Capital expenditures	151,310	147,328	465,424	346,817
EMEA [Member]
Segment Reporting Information [Line Items]
Total revenues	338,833	301,250	976,624	869,715
Total depreciation and amortization	75,276	79,292	230,406	237,846
Capital expenditures	112,578	79,585	347,647	223,440
Asia-Pacific [Member]
Segment Reporting Information [Line Items]
Total revenues	216,890	198,284	624,990	556,620
Total depreciation and amortization	52,063	53,809	156,456	153,179
Capital expenditures	$ 56,346	$ 52,564	$ 132,977	$ 156,787