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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U. S. federal statutory tax rate	21.00%	21.00%	35.00%
Federal tax at statutory rate	$ 6,606	$ 6,843	$ 9,033
State and local taxes, net of federal benefit	308	273	82
U.S. federal permanent items	621	240	(60)
Global intangible low-taxed income	1,738	1,721	(116)
Foreign tax credits	(1,422)	(1,707)	0
Transition tax	0	(1,780)	2,592
Non-U.S. tax rate variances	929	1,011	(1,491)
Valuation allowance	(346)	(57)	88
Tax credits	(464)	(295)	(255)
Tax act impact, deferred rate	0	(680)	3,161
Other, net	152	438	118
Income taxes	$ 8,122	$ 6,007	$ 13,152

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