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Fair Value Measurements - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Counterparty | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Interest and dividends | $ 225,000 |  |  | $ 1,500,000 | $ 606,000 | $ 2,400,000 |
Mark-to-market gain | 1,300,000 |  |  | 1,100,000 | 522,000 | 4,100,000 |
Impairment on natural gas and oil properties | 0 |  |  | 63,679,000 | 22,614,000 | $ 63,679,000 |
Allowance for doubtful accounts on accounts receivable | 5,862,000 |  |  |  | $ 5,862,000 |  | $ 7,111,000
Number of financial institutions included in counter parties | Counterparty |  |  |  |  | 21 |  |
Number of counterparties | Counterparty |  |  |  |  | 5 |  |
Net derivative liability | $ 23,900,000 |  |  |  | $ 23,900,000 |  |
Oklahoma |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Impairment on natural gas and oil properties |  |  | $ 7,300,000 |  |  |  |
Northwest Pennsylvania |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Assets, fair value |  | $ 0 |  |  |  |  |
Impairment on natural gas and oil properties |  | $ 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 |  |  |

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