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Income Taxes - Summary of Differences In Effective Tax Rate and Federal Statutory Rate Due to State Income Taxes, Equity Compensation and Other Tax Items (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Total income (loss) before income taxes | $ 72,676 | $ (199,692) | $ 56,236 | $ 210,015
U.S. federal statutory rate | 21.00% | 35.00% | 21.00% | 35.00%
Total tax expense (benefit) at statutory rate | $ 15,262 | $ (69,892) | $ 11,810 | $ 73,505
State and local income taxes, net of federal benefit | 2,691 | (6,537) | 3,439 | 6,591
Non-deductible executive compensation | 48 | 296 | 601 | 436
Equity compensation | 6 | 56 | 2,146 | 4,808
Change in valuation allowances: |  |  |  |
Federal net operating loss carryforwards & other | 0 | 69 | 0 | 3,487
State net operating loss carryforwards & other | 5,558 | 4,286 | 19,194 | 10,498
Rabbi trust and other | 100 | (508) | 1,499 | (1,561)
Permanent differences and other | 472 | 238 | (394) | 290
Total expense (benefit) for income taxes | $ 24,137 | $ (71,992) | $ 38,295 | $ 98,054
Effective tax rate | 33.20% | 36.10% | 68.10% | 46.70%

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