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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Disclosure [Abstract] |  |
Reserves | $ 3,145 | $ 4,625
Environmental | 11,189 | 20,868
Compensation | 6,782 | 8,950
Post-retirement benefits | 12,570 | 18,318
Research & development expenses | 6,787 | 6,949
Inventories | 1,891 | 1,464
Tax carryforwards | 21,988 | 14,438
Other | 2,106 | 993
Deferred tax assets | 66,458 | 76,605
Valuation allowance | (7,405) | (4,066)
Net deferred tax assets | 59,053 | 72,539
Property | (98,809) | (81,837)
Intangible assets | (17,647) | (16,561)
Pension | (21,941) | (29,041)
Other | (4,110) |
Deferred tax liabilities | (142,507) | (127,439)
Net deferred tax liabilities | $ (83,454) | $ (54,900)

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