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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, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
U. S. federal statutory tax rate	35.00%	35.00%	35.00%
Federal tax at statutory rate	$ 4,097	$ 7,494	$ 11,128
State and local taxes, net of federal benefit	89	290	583
U.S. federal permanent items	251	208	124
Domestic production activities deduction	(321)	(536)	(372)
Foreign earnings and related tax credits	700	700	701
Non-U.S. tax rate variances	(685)	(1,313)	(1,467)
Unrecognized tax benefits	(768)	186	(770)
Valuation allowance	1,754	1,925	1,091
Tax credits	(212)	(184)	(453)
Other, net	126	(221)	642
Income taxes	$ 5,031	$ 8,549	$ 11,207

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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 the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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