Fair Value Measurements - Financial Assets and Liabilities, Excluding Cash and Cash Equivalents Measured on a Recurring Basis at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mutual fund assets	$ 22,209	$ 28,227
Derivative assets:
Foreign currency contracts	36	981
Total assets at fair value	22,245	29,208
Derivative liabilities:
Foreign currency contracts	1,188	429
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mutual fund assets	22,209	28,227
Derivative assets:
Total assets at fair value	22,209	28,227
Level 2 [Member]
Derivative assets:
Foreign currency contracts	36	981
Total assets at fair value	36	981
Derivative liabilities:
Foreign currency contracts	$ 1,188	$ 429