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Income Taxes - Differences Between the Provision for Income Taxes at the U.S. Federal Statutory Rate and the Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U. S. federal statutory tax rate	21.00%	21.00%	21.00%
Federal tax at statutory rate	$ 8,520	$ 6,606	$ 6,843
State and local taxes, net of federal benefit	942	308	273
U.S. federal permanent items	1,323	621	240
Global intangible low-taxed income	1,222	1,738	1,721
Foreign tax credits	(1,204)	(1,422)	(1,707)
Transition tax	0	0	(1,780)
Non-U.S. tax rate variances	1,330	929	1,011
Valuation allowance	(245)	(346)	(57)
Tax credits	(349)	(464)	(295)
Tax act impact, deferred rate	0	0	(680)
Other, net	(729)	152	438
Income taxes	$ 10,810	$ 8,122	$ 6,007

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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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