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Fair Value Measurements - Financial Assets and Liabilities Measured on a Recurring Basis at Fair Value (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Mutual fund assets | $ 25,082 | $ 28,270
Derivative assets: |  |
Foreign currency contracts | 185 | 335
Total assets at fair value | 25,267 | 28,605
Derivative liabilities: |  |
Foreign currency contracts | 10 | 94
Total liabilities at fair value | 10 | 94
Level 1 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Mutual fund assets | 25,082 | 28,270
Derivative assets: |  |
Total assets at fair value | 25,082 | 28,270
Level 2 [Member] |  |
Derivative assets: |  |
Foreign currency contracts | 185 | 335
Total assets at fair value | 185 | 335
Derivative liabilities: |  |
Foreign currency contracts | 10 | 94
Total liabilities at fair value | $ 10 | $ 94

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