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Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ (34,221)  
Cumulative-effect adjustment to retained earnings 301  
Ending balance (37,569) $ (42,490)
Foreign Currency Translation Adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (33,499) (43,459)
Current period other comprehensive (loss) income (4,191) 1,324
Ending balance (37,690) (42,135)
Cash Flow Hedging Instruments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (421) 215
Current period other comprehensive (loss) income 91 (185)
Less reclassification adjustment 451 (107)
Ending balance 121 (77)
Available-for-sale Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (301) (286)
Cumulative-effect adjustment to retained earnings $ 301  
Current period other comprehensive (loss) income   8
Ending balance   $ (278)