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Income Taxes - Principal Components of Current and Non-current Deferred Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Inventory	$ 7,545	$ 12,020
Accrued expenses	3,103	5,551
Investments		1,062
Deferred compensation	5,204	5,751
Stock-based compensation	2,988	4,724
Uncertain tax positions related to state taxes and related interest	370	762
Pensions	4,727	4,273
Foreign losses	3,091	6,486
State losses and credit carry-forwards	3,854	4,021
Federal loss and research carry-forwards	3,058	5,886
Valuation allowance	(6,006)	(6,149)
Total Deferred Tax Assets	27,934	44,387
Property, plant and equipment	(3,553)	(4,433)
Intellectual property	(663)	(1,918)
Investments	(290)
Total Deferred Tax Liabilities	(4,506)	(6,351)
Net Deferred Tax Assets	$ 23,428	$ 38,036

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