Fair Value Measurements - Financial Assets and Liabilities Measured on a Recurring Basis at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mutual fund assets	$ 28,227	$ 25,082
Derivative assets:
Foreign currency contracts	981	185
Total assets at fair value	29,208	25,267
Derivative liabilities:
Foreign currency contracts	429	10
Total liabilities at fair value	429	10
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mutual fund assets	28,227	25,082
Derivative assets:
Total assets at fair value	28,227	25,082
Level 2 [Member]
Derivative assets:
Foreign currency contracts	981	185
Total assets at fair value	981	185
Derivative liabilities:
Foreign currency contracts	429	10
Total liabilities at fair value	$ 429	$ 10