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Income Taxes - Components of Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Comprehensive provision (benefit) for income taxes allocable to: |  |  |  |
Net income (loss) | $ 1,901 | $ (1,516) | $ 4,406 | $ (4,779)
Additional paid-in capital |  |  |  | (100)
Other comprehensive income (loss): |  |  |  |
Currency translation | 200 | 1,200 | 300 | (1,500)
Total | 2,400 |  | 5,300 | (5,800)
Defined Benefit Pension Plans |  |  |  |
Other comprehensive income (loss): |  |  |  |
Defined benefit plans | $ 300 | $ 300 | $ 600 | $ 600

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