Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
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)