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Total Income Tax Expense Applying U.S. Federal Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Computed tax expense at statutory federal rates	$ 6,415	$ 3,010	$ 1,536
Increase (decrease) in taxes resulting from:
State taxes, net of federal income tax benefit	702	454	(11)
Domestic production deduction	(1,272)	(179)	420
Income tax credits	(335)	(662)	(728)
Foreign tax rate differential	(1,587)	(1,590)	(2,159)
Subpart F income	14	9	338
Equity investment	123	223	10
Stock based compensation	208	244	219
State tax rate change	116	185	(257)
Tax interest	920
Other expenses	236	315	181
Total income tax expense (benefit)	$ 5,540	$ 2,009	$ (451)

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