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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, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
U. S. federal statutory tax rate	35.00%	35.00%	35.00%
Federal tax at statutory rate	$ 11,128	$ 15,689	$ 16,098
State and local taxes, net of federal benefit	583	485	590
U.S. federal permanent items	124	332	14
Domestic productions activity deduction	(372)	(669)	(401)
Foreign earnings and related tax credits	658	1,498	261
Non-U.S. tax rate variances	(1,467)	(1,175)	(1,510)
Unrecognized tax benefits	(770)	310	21
Valuation allowance	1,091	(337)	19
Tax credits	(453)	(85)	(265)
Other, net	685	(507)	183
Income taxes	$ 11,207	$ 15,541	$ 15,010

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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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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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