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Schedule of Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Components Of Other Comprehensive Income Loss [Line Items]        
Foreign currency translation adjustment $ 2,972 $ 8,562 $ (16,903) $ (652)
Unrealized (loss) gain on cash flow hedging instruments (329)   1,898  
Income tax benefit (expense) 88   (513)  
Unrealized (loss) gain on cash flow hedging instruments, net of tax (241)   1,385  
Reclassification of gain on cash flow hedging instruments into earnings (1,366)   (1,554)  
Income tax expense 369   420  
Reclassification of gain on cash flow hedging instruments into earnings, net of tax (997)   (1,134)  
Unrealized gain (loss) on available-for-sale securities 23 (14) 34 (12)
Income tax (expense) benefit (9) 5 (13) 4
Unrealized gain (loss) on available-for-sale securities, net of tax 14 (9) 21 (8)
Other comprehensive income (loss) $ 1,748 $ 8,553 $ (16,631) $ (660)