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Fair Value Measurements - Financial Assets and Liabilities Measured on a Recurring Basis at Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mutual fund assets $ 21,225 $ 20,910
Derivative assets:    
Foreign currency contracts 339 112
Total assets at fair value 21,564 21,022
Derivative liabilities:    
Foreign currency contracts 591 305
Interest rate contracts 86 53
Total liabilities at fair value 677 358
Level 1 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mutual fund assets 21,225 20,910
Derivative assets:    
Total assets at fair value 21,225 20,910
Level 2 [Member]    
Derivative assets:    
Foreign currency contracts 339 112
Total assets at fair value 339 112
Derivative liabilities:    
Foreign currency contracts 591 305
Interest rate contracts 86 53
Total liabilities at fair value $ 677 $ 358