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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, 2015
Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mutual fund assets $ 20,273 $ 20,217
Derivative assets:    
Foreign currency contracts 59 73
Total assets at fair value 20,332 20,290
Derivative liabilities:    
Foreign currency contracts 149 628
Interest rate contracts 30  
Total liabilities at fair value 179  
Level 1 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mutual fund assets 20,273 20,217
Derivative assets:    
Total assets at fair value 20,273 20,217
Level 2 [Member]    
Derivative assets:    
Foreign currency contracts 59 73
Total assets at fair value 59 73
Derivative liabilities:    
Foreign currency contracts 149 $ 628
Interest rate contracts 30  
Total liabilities at fair value $ 179