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Fresh Start Accounting - Additional Information (Detail) (USD $) | 6 Months Ended |  |
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Jun. 30, 2013 | Dec. 31, 2012 | Mar. 19, 2012
Statement Of Financial Position [Abstract] |  |  |
Minimum percentage of shares held by voter before confirmation of reorganization | 50.00% |  |
Company's reorganization value |  |  | $ 76,600,000
Loss contract fair market value reserve | $ 51,230,000 | $ 52,217,000 | $ 63,100,000

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