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Notes Payable - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |
Principal outstanding amounts of notes | $ 21,743,000 | $ 31,220,000 |
Principal payments | 10,395,000 | 78,890,000 | $ 36,294,000
Cash interest paid on Notes | 2,887,000 | 18,272,000 | 9,707,000
Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Collateral Account used for future payments | 1,000 | 2,400,000 | 100,000
PIK Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issued aggregate principal amount | 19,400,000 | 18,500,000 | 13,900,000
Runoff Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal outstanding amounts of notes | 21,700,000 | 31,200,000 | 105,500,000
13% Senior First Lien Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issued aggregate principal amount | $ 110,000,000 |  |
Notes maturity date | Mar. 19, 2030 |  |
Principal payments | $ 10,400,000 | 78,900,000 | 36,300,000
13% Senior Second Lien Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issued aggregate principal amount | $ 20,000,000 |  |
Notes maturity date | Mar. 19, 2030 |  |
Principal payments from restricted cash | $ 9,000,000 |  |
13% Senior First And Second Lien Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Cash interest paid on Notes | $ 2,900,000 | $ 5,200,000 | $ 9,700,000

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