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Notes Payable - Additional Information (Detail) (USD $) | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 19, 2012 13% Senior First Lien Notes [Member] | Mar. 19, 2012 13% Senior Second Lien Notes [Member] | Jun. 01, 2012 PIK Notes [Member]
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Debt Instrument [Line Items] |  |  |  |  |
Notes issued |  |  | $ 110,000,000 | $ 20,000,000 | $ 8,300,000
Outstanding amounts of notes | 136,300,000 | 0 |  |  |
Principal payments | 2,000,000 | 0 |  |  |
Restricted cash held for notes payable | $ 25,000,000 |  |  |  |

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