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Income Taxes - Differences Between the Provision for Income Taxes at the U.S. Federal Statutory Rate and the Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
U. S. federal statutory tax rate	35.00%	35.00%	35.00%
Federal tax at statutory rate	$ 7,334	$ 4,097	$ 7,494
State and local taxes, net of federal benefit	20	89	290
U.S. federal permanent items	400	251	208
Domestic production activities deduction	0	(321)	(536)
Foreign earnings and related tax credits	716	700	700
Non-U.S. tax rate variances	(1,484)	(685)	(1,313)
Unrecognized tax benefits	(195)	(768)	186
Valuation allowance	(414)	1,754	1,925
Tax credits	(252)	(212)	(184)
Other, net	(427)	126	(221)
Income taxes	$ 5,698	$ 5,031	$ 8,549

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to repatriation of foreign earnings and foreign tax credits generated or utilized under enacted tax laws during the period.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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