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Fair Value Measurements - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Company Lenders | Jun. 30, 2012 | Dec. 31, 2012
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |  |  |
Interest and dividends | $ 629,000 | $ 125,000 | $ 668,000 | $ 275,000 |
Mark-to-market gain (loss) | 1,000,000 | 2,100,000 | 586,000 | 1,900,000 |
Allowance for uncollectible receivables | 2,500,000 |  | 2,500,000 |  | 2,400,000
Number of financial institutions included in counter parties |  |  | 15 |  |
Number of secured lenders not in banking credit facility |  |  | 2 |  |
Net derivative asset | 7,900,000 |  | 7,900,000 |  |
Surface Property |  |  |  |  |
Fair Value Measurements Of Financial Instruments [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  | $ 741,000 |  |

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