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Notes Payable - Additional Information (Detail) (USD $) | 9 Months Ended | 12 Months Ended | 9 Months Ended |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 13% Senior First Lien Notes [Member] | Sep. 30, 2013 13% Senior First Lien Notes [Member] | Dec. 31, 2013 13% Senior First Lien Notes [Member] | Sep. 30, 2014 13% Senior Second Lien Notes [Member] | Sep. 30, 2014 PIK Notes [Member] | Dec. 31, 2013 PIK Notes [Member] | Sep. 30, 2014 Runoff Notes [Member] | Dec. 31, 2013 Runoff Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Note issued |  |  | $ 110,000,000 |  |  | $ 20,000,000 | $ 17,600,000 | $ 13,900,000 |  |
Notes maturity date |  |  | Mar. 19, 2030 |  |  | Mar. 19, 2030 |  |  |  |
Outstanding amounts of notes | 0 |  |  |  |  |  |  |  | 30,300,000 | 105,500,000
Principal payments |  |  | 78,900,000 |  | 36,300,000 |  |  |  |  |
Cash interest paid on Notes |  |  | 5,100,000 | 9,700,000 |  |  |  |  |  |
Collateral Account used for future payments | 40,000 | 100,000 |  |  |  |  |  |  |  |
Principal and interest payments | $ 40,000 | $ 100,000 |  |  |  |  |  |  |  |

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