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v3.6.0.2

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Income Tax Disclosure [Abstract] |  |
Reserves | $ 4,625 | $ 4,720
Environmental | 20,868 | 7,211
Compensation | 8,950 | 8,250
Post-retirement benefits | 18,318 | 19,476
Research & development expenses | 6,949 | 8,925
Inventories | 1,464 | 3,445
Other | 993 | 605
Tax carryforwards | 14,438 | 8,413
Deferred tax assets | 76,605 | 61,045
Valuation allowance | (4,066) | (3,773)
Net deferred tax assets | 72,539 | 57,272
Property | (81,837) | (84,009)
Intangible assets | (16,561) | (17,748)
Pension | (29,041) | (26,885)
Deferred tax liabilities | (127,439) | (128,642)
Net deferred tax liabilities | $ (54,900) | $ (71,370)

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