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Fair Value Measurements - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) Company Lenders | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Interest and dividends | $ 164 | $ 151 | $ 412 | $ 322 |
Mark-to-market gain (loss) | (4,500) | (1,200) | (3,700) | 1,300 |
Impairment of proved properties and other assets | 502,233 | $ 0 | 502,233 | 24,991 |
Allowance for doubtful accounts on accounts receivable | 3,306 |  | $ 3,306 |  | $ 2,719
Number of financial institutions included in counter parties | Company |  |  | 17 |  |
Number of secured lenders not in banking credit facility | Lenders |  |  | 2 |  |
Net derivative assets | 18,400 |  | $ 18,400 |  |
Fair Value, Measurements, Nonrecurring | Natural Gas and Oil Properties |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment of proved properties and other assets | $ 502,233 |  | $ 502,233 | $ 24,991 |

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