Segment Information - Segment Disclosures (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 1,066,421	$ 900,510	$ 2,015,946	$ 1,744,666
Total depreciation and amortization	254,786	212,051	471,792	412,585
Capital expenditures	348,572	249,867	625,814	447,567
Americas [Member]
Segment Reporting Information [Line Items]
Total revenues	533,608	413,471	970,055	817,865
Total depreciation and amortization	124,342	78,402	212,269	154,661
Capital expenditures	160,679	115,989	314,114	199,489
EMEA [Member]
Segment Reporting Information [Line Items]
Total revenues	322,944	300,609	637,791	568,465
Total depreciation and amortization	78,962	82,504	155,130	158,554
Capital expenditures	151,485	86,582	235,069	143,855
Asia-Pacific [Member]
Segment Reporting Information [Line Items]
Total revenues	209,869	186,430	408,100	358,336
Total depreciation and amortization	51,482	51,145	104,393	99,370
Capital expenditures	$ 36,408	$ 47,296	$ 76,631	$ 104,223