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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] |  |
Deferred compensation | $ 2,637 | $ 2,393
Other accrued liabilities | 1,579 | 1,964
Interest expense carryforward | 11,267 |
Net operating loss | 154,914 | 142,950
Other | 12,581 | 15,933
Less valuation allowance on deferred tax assets | (45,625) | (26,920)
Total deferred tax assets | 137,353 | 136,320
Property, plant and equipment | (191,369) | (186,561)
Prepaid and other insurance reserves | (2,596) | (2,561)
Other |  | (1,985)
Total deferred tax liabilities | (193,965) | (191,107)
Net deferred tax liabilities | $ (56,612) | $ (54,787)

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