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Fair Value Measurements - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 12 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Lenders Company | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2013 Surface Property Fair Value, Measurements, Nonrecurring | Dec. 31, 2013 Surface Property Fair Value, Measurements, Nonrecurring | Sep. 30, 2014 Basis Swaps Fair Value, Inputs, Level 3 Swaps
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Number of natural gas basis swap |  |  |  |  |  |  |  | 4
Interest and dividends | $ 151,000 | $ 111,000 | $ 322,000 | $ 779,000 |  |  |  |
Mark-to-market gain (loss) | (1,200,000) | 3,200,000 | 1,300,000 | 3,800,000 |  |  |  |
Impairment on oil and gas properties |  | 7,012,000 | 24,991,000 |  |  |  |  |
Impairment |  | 7,012,000 | 24,991,000 | 7,753,000 |  | 741,000 | 741,000 |
Allowance for uncollectible receivables | 2,704,000 |  | 2,704,000 |  | 2,494,000 |  |  |
Number of financial institutions included in counter parties |  |  | 15 |  |  |  |  |
Number of secured lenders not in banking credit facility |  |  | 2 |  |  |  |  |
Net derivative liabilities | $ 5,500,000 |  | $ 5,500,000 |  |  |  |  |

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