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Total Income Tax Expense Applying U.S. Federal Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Computed tax expense at statutory federal rates	$ 7,054	$ 8,651	$ 6,415
Increase (decrease) in taxes resulting from:
State taxes, net of federal income tax benefit	1,627	988	820
Domestic production deduction		(150)	(1,272)
Impact of the enactment of the Tax Cuts and Jobs Act (net)	1,089	(3,433)
Income tax credits	(689)	(431)	(335)
Foreign tax rate differential	(37)	(1,503)	(1,587)
Subpart F income	14	3	14
(Gain) loss on equity investments	(61)	62	123
Stock based compensation	277	262	208
Tax interest		(22)	920
Other	(129)	16	234
Total income tax expense (benefit)	$ 9,145	$ 4,443	$ 5,540

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