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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, 2017
Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mutual fund assets $ 26,907 $ 24,055
Derivative assets:    
Foreign currency contracts 621 453
Total assets at fair value 27,528 24,508
Derivative liabilities:    
Foreign currency contracts 807 469
Level 1 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mutual fund assets 26,907 24,055
Derivative assets:    
Total assets at fair value 26,907 24,055
Level 2 [Member]    
Derivative assets:    
Foreign currency contracts 621 453
Total assets at fair value 621 453
Derivative liabilities:    
Foreign currency contracts $ 807 $ 469