Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
December 31, 2015			$ (509,059)
Net change	$ (227,232)	$ 44,864	(134,727)	$ (90,730)
June 30, 2016	(643,786)		(643,786)
Foreign currency translation adjustment (CTA) gain (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
December 31, 2015			(523,709)
Net change			(182,462)
June 30, 2016	(706,171)		(706,171)
Unrealized gain (loss) on cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
December 31, 2015			11,153
Net change			7,942
June 30, 2016	19,095		19,095
Unrealized gain (loss) on available for sale securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
December 31, 2015			(139)
Net change			895
June 30, 2016	756		756
Net investment hedge CTA loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
December 31, 2015			4,484
Net change			38,884
June 30, 2016	43,368		43,368
Defined benefit plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
December 31, 2015			(848)
Net change			14
June 30, 2016	$ (834)		$ (834)