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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Reserves | $ 3,720 | $ 3,145
Environmental | 10,795 | 11,189
Compensation | 3,957 | 6,782
Post-retirement benefits | 2,133 | 12,570
Research & development expenses |  | 6,787
Inventories | (35) | 1,891
Tax carryforwards | 21,843 | 21,988
Other | 3,506 | 2,106
Deferred tax assets | 45,919 | 66,458
Valuation allowance | (30,029) | (7,405)
Net deferred tax assets | 15,890 | 59,053
Property | (66,426) | (98,809)
Intangible assets | (22,231) | (17,647)
Pension | (3,890) | (21,941)
Other | (1,935) | (4,110)
Deferred tax liabilities | (94,482) | (142,507)
Net deferred tax liabilities | $ (78,592) | $ (83,454)

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