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Financial Guarantee Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Detail) € in Thousands, $ in Thousands | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 EUR (€) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 EUR (€) | Jun. 30, 2018 USD ($) | Feb. 12, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($)
Successor [Member] |  |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |  |  |  |  |
Beginning gross loss and loss expense reserves | $ 4,113,802 |  | $ 3,696,038 |  |  |  |  |
Less reinsurance on loss and loss expense reserves | 40,658 |  | 30,767 |  |  |  |  |
Beginning balance of net loss and loss expense reserves | 4,073,144 |  | 3,665,271 |  |  |  |  |
Current Year Claims and Claims Adjustment Expense | 996 |  | 5,137 |  |  |  |  |
Prior Year Claims and Claims Adjustment Expense | (215,812) |  | 195,974 |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims | (214,816) |  | 201,111 |  |  |  |  |
Claim and loss expense payments, net of subrogation and reinsurance | (105) |  | (153) |  |  |  |  |
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance | (3,708,992) |  | (7,607) |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid | 3,709,097 |  | 7,760 |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) | (6,378) |  | 17,622 |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 4,073,144 |  | 3,665,271 |  | $ 142,853 |  | $ 4,073,144 | $ 3,876,244
Add reinsurance on loss and loss expense reserves | 38,293 |  | 47,034 |  |  |  |  |
Ending gross loss and loss expense reserves | 181,146 |  | 3,923,278 |  |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | (870) |  | 16,469 |  |  |  |  |
Net Incurred RMBS Subrogation Recoveries | (17,602) |  | (22,175) |  |  |  |  |
SatisfactionAndDischargeOfSegregatedAccountDeferredPrincipalAmounts |  |  |  |  |  | $ 3,000,158 |  |
SatisfactionAndDischargeOfSegregatedAccountDeferredInterestAmounts |  |  |  |  |  | 856,834 |  |
Loss and Loss Expense Benefit on Settled Deferred Amounts |  |  |  |  |  | $ 288,204 |  |
Ceded Loss And Loss Expenses Paid Not Yet Recovered |  |  |  |  | $ 778 |  | $ 339 | $ (568)
Euro Member Countries, Euro |  |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |  |  |  |  |
Ending gross loss and loss expense reserves | $ 15,084 | € 12,927 | $ 20,212 | € 17,699 |  |  |  |

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