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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
Dec. 31, 2015
Dec. 31, 2014
Assets:    
Foreign currency forward exchange contracts $ 18,106 $ 33,743
Auction rate security   30,960
Total assets   64,703
Liabilities:    
Foreign currency forward exchange contracts 3,720 13,398
Level 1    
Assets:    
Foreign currency forward exchange contracts 0 0
Auction rate security   0
Total assets   0
Liabilities:    
Foreign currency forward exchange contracts 0 0
Level 2    
Assets:    
Foreign currency forward exchange contracts 18,106 33,743
Auction rate security   0
Total assets   33,743
Liabilities:    
Foreign currency forward exchange contracts 3,720 13,398
Level 3    
Assets:    
Foreign currency forward exchange contracts 0 0
Auction rate security   30,960
Total assets   30,960
Liabilities:    
Foreign currency forward exchange contracts $ 0 $ 0