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Commitments and Contingencies - Additional Information (Detail) | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2013 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Number of RMBS Trustees Filing Suit |  |  | 3 |
Number of Cash Claim Payments by Ambac Assurance |  |  | 2 |
Gain (Loss) Related to Litigation Settlement |  |  | $ 7,760,000 |
Ambac [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Premium Income Due From Summary Judgment |  |  | 2,700 |
Ambac Assurance [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Damages Sought, Value |  |  | 800,000 |
Litigation settlement amount |  |  | 7,760,000 |
Successor [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Operating Leases, Rent Expense |  | $ 3,422,000 | 5,746,000 | $ 5,588,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  |  | 6,529,000 |
Operating Leases, Future Minimum Payments, Due in Two Years |  |  | 6,944,000 |
Operating Leases, Future Minimum Payments, Due in Three Years |  |  | 6,964,000 |
Operating Leases, Future Minimum Payments, Due in Four Years |  |  | 5,691,000 |
Operating Leases, Future Minimum Payments, Due in Five Years |  |  | 1,935,000 |
Operating Leases, Future Minimum Payments, Due Thereafter |  |  | 15,613,000 |
Operating Leases, Future Minimum Payments Due |  |  | $ 43,676,000 |
Predecessor [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Operating Leases, Rent Expense | $ 1,871,000 |  |  |
Contra Costa Complaint [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of California Municipal Entities |  |  | 5 |
Alameda Complaint [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of California Municipal Entities |  |  | 19 |
Olympic Club Complaint [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of Olympic Club Actions |  |  | 3 |

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