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Notes Payable - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |
Collateral Account used for future payments | $ 0.4 |  | $ 2.4
PIK Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issued aggregate principal amount | 19.4 |  | 18.5
Runoff Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding amounts of notes | 29.2 |  | 31.2
13% Senior First Lien Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issued aggregate principal amount | $ 110.0 |  |
Notes maturity date | Mar. 19, 2030 |  |
Principal payments | $ 3.0 |  | 78.9
Cash interest paid on Notes | 1.0 | $ 4.2 |
13% Senior Second Lien Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issued aggregate principal amount | $ 20.0 |  |
Notes maturity date | Mar. 19, 2030 |  |
Principal payments from restricted cash | $ 9.0 |  |
Notes Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal and interest payments | $ 0.4 |  | $ 2.4

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