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Income Taxes - Principal Components of Current and Non-current Deferred Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Inventory	$ 6,609	$ 7,545
Accrued expenses	2,850	3,103
Investments	1,122
Deferred compensation	4,779	5,204
Stock-based compensation	3,069	2,988
Uncertain tax positions related to state taxes and related interest	326	370
Pensions	5,538	4,727
Foreign losses	3,097	3,091
State losses and credit carry-forwards	8,164	3,854
Federal loss and research carry-forwards	17,495	3,058
Valuation allowance	(5,816)	(6,006)
Total Deferred Tax Assets	47,233	27,934
Property, plant and equipment	(3,515)	(3,553)
Intellectual property	(6,531)	(663)
Investments		(290)
Total Deferred Tax Liabilities	(10,046)	(4,506)
Net Deferred Tax Assets	$ 37,187	$ 23,428

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