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Fair Value Measurements - Financial Assets and Liabilities Measured and Reported at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Assets:      
Foreign currency forward exchange contracts $ 4,084 $ 27,207 $ 9,075
Available-for-sale security 7,354 14,939  
Total assets 11,438 42,146  
Liabilities:      
Foreign currency forward exchange contracts 29,877 9,212 6,513
Cross currency swap contract     1,532
Total liabilities     8,045
Level 1      
Assets:      
Foreign currency forward exchange contracts 0 0 0
Available-for-sale security 7,354 14,939  
Total assets 7,354 14,939  
Liabilities:      
Foreign currency forward exchange contracts 0 0 0
Cross currency swap contract     0
Total liabilities     0
Level 2      
Assets:      
Foreign currency forward exchange contracts 4,084 27,207 9,075
Available-for-sale security 0 0  
Total assets 4,084 27,207  
Liabilities:      
Foreign currency forward exchange contracts 29,877 9,212 6,513
Cross currency swap contract     1,532
Total liabilities     8,045
Level 3      
Assets:      
Foreign currency forward exchange contracts 0 0 0
Available-for-sale security 0 0  
Total assets 0 0  
Liabilities:      
Foreign currency forward exchange contracts $ 0 $ 0 0
Cross currency swap contract     0
Total liabilities     $ 0