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Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 957,310  
Ending balance 1,003,303  
Foreign currency translation adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (47,204) $ (23,623)
Current period other comprehensive (loss) income 9,095 (10,065)
Ending balance (38,109) (33,688)
Cash flow hedging instruments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 600 168
Current period other comprehensive (loss) income (1,125) 831
Less reclassification adjustment 239 (680)
Ending balance (286) 319
Available-for-sale securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (300) (292)
Current period other comprehensive (loss) income (9) 21
Ending balance (309) (271)
Accumulated Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Ending balance $ (38,704) $ (33,640)