Derivative Financial Instruments - Summary of Impact of Derivative Financial Instruments to Consolidated Statement of Operations and Consolidated Statement of Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Investment Hedges [Member] | Foreign Currency Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in other comprehensive income	$ 1,138
Gain reclassified from AOCI into net income	0	0	0
Freestanding Derivatives [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in other comprehensive income			(10,449)
Loss reclassified from AOCI into net income			(15,066)
Gain recognized in net income		$ 136