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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) included in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]            
Foreign currency translation adjustments $ (31,531)   $ (15,212)      
Net gain on investments 230   241      
Net loss on derivative financial instruments (72,784)   (82,837)      
Accumulated other comprehensive loss $ (104,085) $ (94,024) $ (97,808) $ (68,041) $ (33,666) $ (47,710)