Income Taxes - Principal Components of Current and Non-current Deferred Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Accounts receivable		$ 7
Inventory	$ 12,020	12,558
Accrued expenses	5,551	6,359
Investments	1,062
Deferred compensation	5,751	5,072
Stock-based compensation	4,724	4,704
Uncertain tax positions related to state taxes and related interest	762	1,026
Pensions	4,273	5,729
Foreign losses	6,486	5,389
State losses and credit carry-forwards	4,021	4,187
Federal loss and research carry-forwards	5,886	5,886
Valuation allowance	(6,149)	(7,250)
Total Deferred Tax Assets	44,387	43,667
Property, plant and equipment	(4,433)	(3,315)
Accrued expenses		(2,791)
Intellectual property	(1,918)	(476)
Investments		(70)
Total Deferred Tax Liabilities	(6,351)	(6,652)
Net Deferred Tax Assets	$ 38,036	$ 37,015