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Fair Value Measurements - Additional Information (Detail) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) Counterparty | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Interest and dividends | $ 168,000 | $ 118,000 |
Mark-to-market gain (loss) | (7,500,000) | 1,500,000 |
Impairment on natural gas and oil properties | 7,312,000 | $ 0 |
Allowance for doubtful accounts on accounts receivable | $ 7,112,000 |  | $ 7,111,000
Number of financial institutions included in counter parties | Counterparty | 19 |  |
Number of counterparties | Counterparty | 5 |  |
Net derivative liability | $ 15,400,000 |  |
Oklahoma |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Impairment on natural gas and oil properties | $ 7,300,000 |  |

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