Segment Information - Segment Disclosures (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total revenues	$ 2,725,867,000	$ 2,443,776,000	$ 2,152,766,000
Total depreciation and amortization	525,580,000	481,691,000	432,731,000
Capital expenditures	868,120,000	660,203,000	572,406,000
U.S. [Member]
Segment Reporting Information [Line Items]
Total revenues	1,404,648	1,257,661	1,157,790
Americas [Member]
Segment Reporting Information [Line Items]
Total revenues	1,512,535,000	1,376,103,000	1,264,774,000
Total depreciation and amortization	278,216,000	261,018,000	254,365,000
Capital expenditures	401,685,000	333,315,000	261,936,000
EMEA [Member]
Segment Reporting Information [Line Items]
Total revenues	698,807,000	637,265,000	525,018,000
Total depreciation and amortization	117,655,000	114,511,000	90,891,000
Capital expenditures	202,322,000	151,634,000	170,365,000
Asia-Pacific [Member]
Segment Reporting Information [Line Items]
Total revenues	514,525,000	430,408,000	362,974,000
Total depreciation and amortization	129,709,000	106,162,000	87,475,000
Capital expenditures	$ 264,113,000	$ 175,254,000	$ 140,105,000