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Income Taxes - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 22, 2017 | Oct. 18, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit |  |  | $ (349,080,000) | $ (71,992,000) | $ 57,651,000 | $ 112,395,000 | $ (95,581,000) | $ (13,705,000) | $ (129,488,000) | $ (41,976,000) |  | $ (251,026,000) | $ (280,750,000) | $ (338,677,000)
Corporate tax rate |  |  |  |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
Deferred tax liabilities |  |  | 693,356,000 |  |  |  | $ 943,343,000 |  |  |  |  | $ 693,356,000 | $ 943,343,000 |
Deductible limit |  |  | 1,000,000 |  |  |  |  |  |  |  |  | 1,000,000 |  |
Accrued interest or penalties related to tax amounts |  |  | 0 |  |  |  |  |  |  |  |  | $ 0 |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2018 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2035 |  |
Deferred compensation plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation allowances |  |  | 1,900,000 |  |  |  |  |  |  |  |  | $ 1,900,000 |  |
Amendment on Internal Revenue Code of 1986 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate tax rate |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |
One-time tax benefit related to tax law changes | $ 334,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amendment on Internal Revenue Code of 1986 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate tax rate |  |  |  |  |  |  |  |  |  |  | 21.00% |  |  |
Oklahoma, Texas and West Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
State valuation allowance |  |  | 36,300,000 |  |  |  |  |  |  |  |  | $ 36,300,000 |  |
Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
State valuation allowance |  |  | 57,500,000 |  |  |  |  |  |  |  |  | $ 57,500,000 |  |
Minimum net operating loss deduction amount |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of taxable income |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss deduction, description |  |  |  |  |  |  |  |  |  |  |  | The Supreme Court ruled that the net operating loss deduction limitation violated the Uniformity Clause of the Pennsylvania Constitution and struck the $3.0 million flat cap limitation but not the percentage of taxable income limitation. |  |
Net operating loss carryforwards |  |  | 872,600,000 |  |  |  |  |  |  |  |  | $ 872,600,000 |  |
Pennsylvania | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2025 |  |
Pennsylvania | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period during which net operating loss carryforwards and alternative minimum tax expire |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2036 |  |
Federal and State |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |

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