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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
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Assets:      
Foreign currency forward exchange contracts (a) $ 8,706 $ 27,207 $ 10,496
Available-for-sale security (b) 11,201 14,939  
Assets 19,907 42,146  
Liabilities:      
Foreign currency forward exchange contracts (a) 26,618 9,212 17,025
Liability     18,283
Level 1      
Assets:      
Foreign currency forward exchange contracts (a) 0 0 0
Available-for-sale security (b) 11,201 14,939  
Assets 11,201 14,939  
Liabilities:      
Foreign currency forward exchange contracts (a) 0 0 0
Liability     0
Level 2      
Assets:      
Foreign currency forward exchange contracts (a) 8,706 27,207 10,496
Available-for-sale security (b) 0 0  
Assets 8,706 27,207  
Liabilities:      
Foreign currency forward exchange contracts (a) 26,618 9,212 17,025
Liability     18,283
Level 3      
Assets:      
Foreign currency forward exchange contracts (a) 0 0 0
Available-for-sale security (b) 0 0  
Assets 0 0  
Liabilities:      
Foreign currency forward exchange contracts (a) $ 0 $ 0 0
Liability     0
Currency Swap      
Liabilities:      
Liability     1,258
Currency Swap | Level 1      
Liabilities:      
Liability     0
Currency Swap | Level 2      
Liabilities:      
Liability     1,258
Currency Swap | Level 3      
Liabilities:      
Liability     $ 0