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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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