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Total Income Tax Expense Applying U.S. Federal Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Computed tax expense at statutory federal rates	$ 3,993	$ 7,054	$ 8,651
Increase (decrease) in taxes resulting from:
State taxes, net of federal income tax benefit	1,131	1,627	988
Domestic production deduction			(150)
Impact of the enactment of the Tax Cuts and Jobs Act (net)		1,089	(3,433)
Income tax credits	(819)	(689)	(431)
Foreign tax rate differential	341	(37)	(1,503)
Subpart F income		14	3
(Gain) loss on equity investments		(61)	62
Stock based compensation	366	277	262
Global intangible low-taxed income	249
Other	(59)	(129)	(6)
Total income tax expense (benefit)	$ 5,202	$ 9,145	$ 4,443

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