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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Deferred compensation | $ 2,106 | $ 2,073
Other accrued liabilities | 2,142 | 1,051
Right-of-use-assets | 6,471 | 3,774
Interest expense carryforward | 36,165 | 23,164
Net operating loss | 170,362 | 163,750
Other | 10,255 | 11,220
Less valuation allowance on deferred tax assets | (64,655) | (51,589)
Total deferred tax assets | 162,846 | 153,443
Property, plant and equipment | (183,335) | (182,572)
Lease liability | (6,508) | (3,809)
Prepaid and other insurance reserves | (3,942) | (2,779)
Total deferred tax liabilities | (193,785) | (189,160)
Net deferred tax liabilities | $ (30,939) | $ (35,717)

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