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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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Disclosure Other Comprehensive Income Loss Tax Effects Allocated To Component Of Other Comprehensive Income Loss.

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Income taxes benefit allocable to additional paid in capital.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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