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Fair Value Measurements - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Lenders Company | Jun. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2013 Surface Property Fair Value, Measurements, Nonrecurring | Jun. 30, 2013 Surface Property Fair Value, Measurements, Nonrecurring | Dec. 31, 2013 Surface Property Fair Value, Measurements, Nonrecurring | Jun. 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 | $ 103,000 | $ 629,000 | $ 171,000 | $ 668,000 |  |  |  |  |
Mark-to-market gain (loss) | 2,100,000 | (1,000,000) | 2,600,000 | 586,000 |  |  |  |  |
Impairment on oil and gas properties | 25,000,000 |  | 25,000,000 |  |  |  |  |  |
Impairment | 24,991,000 | 741,000 | 24,991,000 | 741,000 |  | 741,000 | 741,000 | 741,000 |
Allowance for uncollectible receivables | 2,700,000 |  | 2,700,000 |  | 2,500,000 |  |  |  |
Number of financial institutions included in counter parties |  |  | 15 |  |  |  |  |  |
Number of secured lenders not in banking credit facility |  |  | 2 |  |  |  |  |  |
Net derivative liabilities | $ 2,300,000 |  | $ 2,300,000 |  |  |  |  |  |

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