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Schedule of Tax Effects Allocated to Each Component of Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Components Of Other Comprehensive Income Loss [Line Items]        
Foreign currency translation adjustment $ (14,682) $ (11,996) $ (31,585) $ (12,648)
Unrealized gain on cash flow hedging instruments 1,294   3,192  
Income tax expense (348)   (861)  
Unrealized gain on cash flow hedging instruments, net of tax 946   2,331  
Reclassification of gain on cash flow hedging instruments into earnings (356)   (1,910)  
Income tax expense 96   516  
Reclassification of gain on cash flow hedging instruments into earnings, net of tax (260)   (1,394)  
Unrealized (loss) gain on available-for-sale securities (25) (9) 9 (21)
Income tax benefit (expense) 10 4 (3) 8
Unrealized (loss) gain on available-for-sale securities, net of tax (15) (5) 6 (13)
Other comprehensive loss $ (14,011) $ (12,001) $ (30,642) $ (12,661)