Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			$ 2,348,142	$ 1,878,744
Other comprehensive income (loss) before reclassifications			(12,395)	6,121
Amounts reclassified from accumulated other comprehensive loss due to de-designation of interest rate swaps	$ (1,529)	$ 0	(1,529)	0
Amounts reclassified from accumulated other comprehensive loss			5,107	9,091
Total other comprehensive income (loss), net of tax	(7,024)	10,270	(8,817)	15,212
Ending balance	2,233,691	2,127,714	2,233,691	2,127,714
Foreign Currency [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(28,187)	(43,500)
Other comprehensive income (loss) before reclassifications			(22,448)	9,749
Amounts reclassified from accumulated other comprehensive loss due to de-designation of interest rate swaps			0
Amounts reclassified from accumulated other comprehensive loss			0	0
Total other comprehensive income (loss), net of tax			(22,448)	9,749
Ending balance	(50,635)	(33,751)	(50,635)	(33,751)
Effective Portion of Change in Fair Value of Derivatives [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(4,347)	(12,751)
Other comprehensive income (loss) before reclassifications			8,736	(4,418)
Amounts reclassified from accumulated other comprehensive loss due to de-designation of interest rate swaps			(1,529)
Amounts reclassified from accumulated other comprehensive loss			2,618	4,483
Total other comprehensive income (loss), net of tax			9,825	65
Ending balance	5,478	(12,686)	5,478	(12,686)
Proportionate Share of Equity Investee's OCI [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			7,315	(6,498)
Other comprehensive income (loss) before reclassifications			1,317	790
Amounts reclassified from accumulated other comprehensive loss due to de-designation of interest rate swaps			0
Amounts reclassified from accumulated other comprehensive loss			2,489	4,608
Total other comprehensive income (loss), net of tax			3,806	5,398
Ending balance	11,121	(1,100)	11,121	(1,100)
AOCI [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(25,219)	(62,749)
Ending balance	$ (34,036)	$ (47,537)	$ (34,036)	$ (47,537)