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Special Purpose Entities, Including Variable Interest Entities - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2015 USD ($) | Jun. 30, 2017 USD ($) Entity | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) Entity | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) Entity
Variable Interest Entities [Line Items] |  |  |  |  |  |
Equity Method Investments |  | $ 32,418 |  | $ 32,418 |  | $ 30,003
Number of RMBS Sold | 17 |  |  |  |  |
Cash Received From Delaware Trust | $ 146,000 |  |  |  |  |
Secured Debt |  | 85,981 |  | 85,981 |  | 102,403
Par Value of Securities Placed in Trust |  | 311,528 |  | 311,528 |  |
Fair Value of Securities Placed in Trust |  | 352,446 |  | 352,446 |  | 360,759
Securities Issued by Delaware Trust | $ 146,000 |  |  |  |  |
Consolidated VIE assets |  | 14,095,210 |  | 14,095,210 |  | 13,367,834
Consolidated VIE liabilities |  | 13,967,628 |  | 13,967,628 |  | 13,235,425
Successor [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Variable Interest Entity Change in Fair Value of Assets and Liabilities |  | (1,219) | $ 8,987 | 2,482 | $ (18,176) |
Fair value of special purpose entities |  | 6,691 |  | 6,691 |  | 7,382
variable interest entities deconsolidation gain loss |  | 0 | 0 | 0 | 0 |
Variable Interest Entity, Measure of Activity, Income or Loss before Tax |  | (1,219) | $ 8,987 | $ 2,482 | $ (18,176) |
Asset-Backed Securities and Utility Obligations [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Weighted average life |  |  |  | 4 years 10 months 15 days |  |
Average rating of assets held by sponsored special purpose entities |  |  |  | BBB+ |  |
Sponsored Variable Interest Entities [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Total principal amount of debt outstanding |  | $ 409,830 |  | $ 409,830 |  | $ 388,950
Consolidated Entities [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Number of Newly Consolidated Variable Interest Entities |  | 0 | 0 | 0 | 0 |
Number of DeConsolidated Variable Interest Entities |  | 0 | 0 | 0 | 0 |
Number of consolidated Variable Interest Entities | Entity |  | 12 |  | 12 |  | 12
Ambac UK [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Number of consolidated Variable Interest Entities | Entity |  | 8 |  | 8 |  | 8
Consolidated VIE assets |  | $ 13,700,687 |  | $ 13,700,687 |  | $ 12,950,009
Consolidated VIE liabilities |  | $ 13,583,319 |  | $ 13,583,319 |  | $ 12,833,466
Ambac Assurance [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Number of consolidated Variable Interest Entities | Entity |  | 4 |  | 4 |  | 4
London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |
Interest Rate on Securities Issued by Delaware Trust | 2.80% |  |  |  |  |

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