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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Disclosure [Abstract] |  |
Product liability | $ 28,481 | $ 1,303
Net operating losses and tax credit carryforwards | 10,013 | 16,218
Accrued expenses and other reserves | 4,237 | 5,381
Share-based compensation | 6,444 | 10,462
Employee benefits | 6,401 | 9,538
Capitalized research and development | 2,442 | 4,654
Reserve for doubtful accounts | 928 | 1,178
Inventory | 636 | 1,218
Other | 1,127 | 1,316
Total deferred tax assets | 60,709 | 51,268
Valuation allowances | (4,559) | (5,303)
Net deferred tax assets | 56,150 | 45,965
Goodwill and intangibles | (30,368) | (42,007)
Property, plant and equipment | (8,056) | (11,394)
Other | (1,242) | (3,368)
Total deferred tax liabilities | 39,666 | 56,769
Net deferred tax assets | $ 16,484 |
Net deferred tax liabilities |  | $ (10,804)

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