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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U. S. federal statutory tax rate	35.00%	35.00%	35.00%
Federal tax at statutory rate	$ 9,033	$ 7,334	$ 4,097
State and local taxes, net of federal benefit	82	20	89
U.S. federal permanent items	(60)	400	251
Domestic production activities deduction	(116)	0	(321)
Foreign earnings and related tax credits	0	716	700
Tax act - transition tax	2,592	0	0
Non-U.S. tax rate variances	(1,491)	(1,484)	(685)
Unrecognized tax benefits	0	(195)	(768)
Valuation allowance	88	(414)	1,754
Tax credits	(255)	(252)	(212)
Tax Act - remeasurement of deferreds	3,161	0	0
Other, net	118	(427)	126
Income taxes	$ 13,152	$ 5,698	$ 5,031

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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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