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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 | Jun. 30, 2020 | Dec. 31, 2019
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Mutual fund assets | $ 26,244 | $ 28,227
Derivative assets: |  |
Foreign currency contracts | 97 | 981
Total assets at fair value | 26,341 | 29,208
Derivative liabilities: |  |
Foreign currency contracts | 276 | 429
Level 1 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Mutual fund assets | 26,244 | 28,227
Derivative assets: |  |
Total assets at fair value | 26,244 | 28,227
Level 2 [Member] |  |
Derivative assets: |  |
Foreign currency contracts | 97 | 981
Total assets at fair value | 97 | 981
Derivative liabilities: |  |
Foreign currency contracts | $ 276 | $ 429

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