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Financial Guarantee Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Feb. 12, 2018
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |  |  |  |
Impact of VIE Consolidation on Gross Loss and Loss Reserves |  |  | $ (72,159) |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |  |  |
Beginning gross loss and loss expense reserves | $ (106,882) | $ 4,113,802 |  |  |  |
Less reinsurance on loss and loss expense reserves | 22,623 | 40,658 |  |  |  |
Beginning balance of net loss and loss expense reserves | (129,505) | 4,073,144 |  |  |  |
Current Year Claims and Claims Adjustment Expense | 681 | 778 |  |  |  |
Prior Year Claims and Claims Adjustment Expense | 11,726 | (248,173) |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims | 12,407 | (247,395) |  |  |  |
Claim and loss expense payments, net of subrogation and reinsurance | (28) | 0 |  |  |  |
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance | (64,409) | (3,631,177) |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid | 64,437 | 3,631,177 |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) | 5,502 | 11,016 |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | (129,505) | 4,073,144 | (176,033) | $ (129,505) | $ 205,588 |
Add reinsurance on loss and loss expense reserves | 26,238 | 38,735 |  |  |  |
Ending gross loss and loss expense reserves | (221,954) | 244,323 |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 4,996 | (1,354) |  |  |  |
Net Incurred RMBS Subrogation Recoveries | $ (4,407) | $ (800) |  |  |  |
satisfaction and discharge of segregated account deferred interest amounts |  |  |  |  |  | $ 856,834
Loss and Loss Expense Benefit on Settled Deferred Amounts |  |  |  |  |  | $ 288,204
Ceded Loss And Loss Expenses Paid Not Yet Recovered |  |  | $ 550 | $ 510 | $ 90 |

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