Stockholder's Equity - Components of Accumulated Other Comprehensive Income (Loss) included in Stockholders' Equity (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Stockholders Equity Note [Abstract]
Foreign currency translation adjustments (“FCTA”)	$ (37,295)		$ (29,925)
Net unrealized gain on investments	264		247
Net gain (loss) on derivative financial instruments	(28,844)		(64,277)
Accumulated other comprehensive loss	$ (65,875)	$ (66,489)	$ (93,955)	$ (94,024)	$ (116,690)	$ (97,808)