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Income Taxes - Reconciliation of Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income taxes computed at the federal statutory rate, Value	$ 3,196	$ 1,977	$ 1,002
State income taxes, net of federal tax benefit, Value	404	387	116
Excess tax benefits from stock options/restricted shares	(9)	(93)	(140)
Estimated charge for U.S. tax reform		251	372
Charge for global intangible low-taxed income ("GILTI")	69
Difference in tax rate on foreign earnings/other	414	201	(28)
Total provision for income taxes	$ 4,074	$ 2,723	$ 1,322
Income taxes computed at the federal statutory rate	21.00%	21.00%	34.00%
State income taxes, net of federal tax benefit	2.70%	4.10%	3.90%
Excess tax benefit from stock options/restricted shares	(0.10%)	(1.00%)	(4.70%)
Estimated charge for U.S. tax reform		2.70%	12.60%
Charge for global intangible low-taxed income ("GILTI") [Rate]	0.50%
Difference in income tax rate on foreign earnings/other	2.70%	2.10%	(1.00%)
Effective for income tax rate, Total	26.80%	28.90%	44.80%

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