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Fair Value Measurements - Financial Assets and Liabilities, Excluding Cash and Cash Equivalents, Measured on a Recurring Basis at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mutual fund assets $ 30,652 $ 28,227
Derivative assets:    
Foreign currency contracts 335 981
Total assets at fair value 30,987 29,208
Derivative liabilities:    
Foreign currency contracts 566 429
Level 1 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Mutual fund assets 30,652 28,227
Derivative assets:    
Total assets at fair value 30,652 28,227
Level 2 [Member]    
Derivative assets:    
Foreign currency contracts 335 981
Total assets at fair value 335 981
Derivative liabilities:    
Foreign currency contracts $ 566 $ 429