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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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