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Fair Value Measurements - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2016 Counterparty | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Interest and dividends | $ 192,000 | $ 164,000 |  | $ 509,000 | $ 412,000 |
Mark-to-market gain (loss) | 2,300,000 | (4,500,000) |  | 3,700,000 | (3,700,000) |
Impairment on natural gas and oil properties | 0 | 502,233,000 |  | 43,040,000 | 502,233,000 |
Allowance for doubtful accounts on accounts receivable | 5,555,000 |  |  | 5,555,000 |  | $ 4,994,000
Number of financial institutions included in counter parties | Counterparty |  |  | 24 |  |  |
Number of counterparties | Counterparty |  |  | 6 |  |  |
Net derivative asset | $ 24,100,000 |  |  | 24,100,000 |  |
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 |  |
Northern Oklahoma and Northwest Pennsylvania |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impairment on natural gas and oil properties |  | $ 502,200,000 |  |  | $ 502,200,000 |

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