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Income Taxes - Reconciliation of Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income taxes computed at the federal statutory rate, Value	$ 2,653	$ 3,196	$ 1,977
State income taxes, net of federal tax benefit, Value	602	404	387
Excess tax benefits from stock options/restricted shares	(920)	(9)	(93)
Estimated charge for U.S. tax reform			251
Charge for global intangible low-taxed income ("GILTI")	(20)	69
Difference in tax rate on foreign earnings/other	285	407	201
Change in valuation allowance	172	7
Total provision for income taxes	$ 2,772	$ 4,074	$ 2,723
Income taxes computed at the federal statutory rate	21.00%	21.00%	21.00%
State income taxes, net of federal tax benefit	4.70%	2.70%	4.10%
Excess tax benefit from stock options/restricted shares	(7.30%)	(0.10%)	(1.00%)
Estimated charge for U.S. tax reform			2.70%
Charge for global intangible low-taxed income ("GILTI") [Rate]	(0.20%)	0.50%
Difference in income tax rate on foreign earnings/other	2.30%	2.70%	2.10%
Change in valuation allowance[Percent]	1.40%
Effective for income tax rate, Total	21.90%	26.80%	28.90%

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