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Fair Value Measurements - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Interest and dividends |  |  |  |  | $ 1,100,000 | $ 4,100,000 | $ 972,000
Mark-to-market gain (loss) |  |  |  |  | $ (7,900,000) | 4,200,000 | 3,100,000
Closing stock price | $ 9.57 |  |  |  | $ 9.57 |  |
Impairment of goodwill | $ 1,641,197,000 | $ 0 | $ 0 | $ 0 | $ 1,641,197,000 | 0 | 0
Northwest Pennsylvania |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Assets, fair value | $ 0 |  |  |  | 0 |  |
Impairment on natural gas and oil properties |  |  |  | $ 7,300,000 | $ 15,300,000 |  |
Oklahoma And Texas Panhandle |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Impairment on natural gas and oil properties |  |  |  |  |  | $ 63,700,000 |
Western Oklahoma |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Impairment on natural gas and oil properties |  |  |  |  |  |  | $ 43,000,000

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