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Schedule of Tax Effects Allocated to Each Component of Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components Of Other Comprehensive Income Loss [Line Items]      
Foreign currency translation adjustment $ (39,378) $ (21,117) $ (16,365)
Unrealized gain on cash flow hedging instruments 3,716 384  
Income tax expense (1,003) (104)  
Unrealized gain on cash flow hedging instruments, net of tax 2,713 280  
Reclassification of gain on cash flow hedging instruments into earnings (2,730)    
Income tax expense 737    
Reclassification of gain on cash flow hedging instruments into earnings, net of tax (1,993)    
Unrealized (loss) gain on available-for-sale securities (12) 1 39
Income tax benefit (expense) 4   (15)
Unrealized (loss) gain on available-for-sale securities, net of tax (8) 1 24
Other comprehensive loss $ (38,666) $ (20,836) $ (16,341)