Accumulated Other Comprehensive Loss - Components Of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 2,333,307	$ 2,572,871
Foreign currency translation gain (loss)	44,481	92,780
Loss on derivative instruments, net of tax of $(3.5) million and $(7.3) million, respectively	(8,690)	(20,053)
Balance	2,403,343	2,701,619
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(504,528)
Foreign currency translation gain (loss)	44,522
Balance	(460,006)
Change in Fair Value of Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	43,966
Loss on derivative instruments, net of tax of $(3.5) million and $(7.3) million, respectively	(8,690)
Balance	35,276
Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(1,815)
Foreign currency translation gain (loss)	(41)
Balance	(1,856)
Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(462,377)	(374,118)
Balance	$ (426,586)	$ (301,391)