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Fair Value Measurements - Value of Assets Measured at Fair Value on Non Recurring Basis (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Impairment of proved properties and other assets | $ 502,233 | $ 0 | $ 502,233 | $ 24,991
Fair Value, Measurements, Nonrecurring | Natural Gas and Oil Properties |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair Value | 98,872 | $ 0 | 98,872 | 18,086
Impairment of proved properties and other assets | $ 502,233 |  | $ 502,233 | $ 24,991

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