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Fair Value Measurements - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 Company Lenders | Mar. 31, 2013 | Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Interest and dividends | $ 274,000 | $ 40,000 |
Mark-to-market gain (loss) | 429,000 | 1,600,000 |
Allowance for uncollectible receivables | 2,500,000 |  | 2,500,000
Number of financial institutions included in counter parties | 14 |  |
Number of secured lenders not in banking credit facility | 2 |  |
Net derivative asset | $ 3,800,000 |  |
Basis Swap | Fair Value, Inputs, Level 3 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Number of natural gas basis swap | 4 |  |

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