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Fair Value Measurements - Additional Information (Detail) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) Counterparty | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Interest and dividends | $ 204,000 | $ 181,000 | $ 323,000 | $ 317,000 |
Mark-to-market gain (loss) | 1,500,000 | 1,200,000 | 3,000,000 | 1,400,000 |
Impairment on natural gas and oil properties | 0 | $ 0 | 0 | 43,040,000 |
Allowance for doubtful accounts on accounts receivable | 5,861,000 |  | $ 5,861,000 |  | $ 5,559,000
Number of financial institutions included in counter parties | Counterparty |  |  | 22 |  |
Number of counterparties | Counterparty |  |  | 5 |  |
Net derivative asset | 9,500,000 |  | $ 9,500,000 |  |
Western Oklahoma |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment on natural gas and oil properties | $ 0 |  | $ 0 | $ 43,000,000 |

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