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Fair Value Measurements - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2019 USD ($) Counterparty | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Interest and dividends | $ 197,000 | $ 225,000 |  |  | $ 560,000 | $ 606,000 |
Mark-to-market gain (loss) | (361,000) | $ 1,300,000 |  |  | 6,300,000 | $ 522,000 |
Allowance for doubtful accounts on accounts receivable | 4,274,000 |  |  |  | $ 4,274,000 |  | $ 6,118,000
Number of derivative counterparties | Counterparty |  |  |  |  | 19 |  |
Number of counter parties that are not participants in bank credit facility | Counterparty |  |  |  |  | 3 |  |
Counterparties not in Facility |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Net derivative receivable | 2,000,000.0 |  |  |  | $ 2,000,000.0 |  |
Natural Gas and Oil Properties | Fair Value, Measurements, Nonrecurring |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Impairment on natural gas and oil properties | $ 0 |  |  |  | $ 0 |  |
Oklahoma |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Impairment on natural gas and oil properties |  |  |  | $ 7,300,000 |  |  |
Oklahoma | Natural Gas and Oil Properties | Fair Value, Measurements, Nonrecurring |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value |  |  |  | $ 32,500,000 |  |  |
Northwest Pennsylvania |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Impairment on natural gas and oil properties |  |  | $ 15,300,000 |  |  |  |
Fair value |  |  | $ 0 |  |  |  |

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