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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
 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
EUR (€)
Sep. 30, 2017
USD ($)
Sep. 30, 2017
EUR (€)
Sep. 30, 2018
USD ($)
Feb. 12, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
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 976   5,328          
Prior Year Claims and Claims Adjustment Expense (182,291)   405,589          
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims (181,315)   410,917          
Claim and loss expense payments, net of subrogation and reinsurance (143)   (330)          
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance (3,937,561)   (148,082)          
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid 3,937,704   148,412          
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) (9,578)   26,556          
Liability for Unpaid Claims and Claims Adjustment Expense, Net 4,073,144   3,665,271   $ (55,453)   $ 4,073,144 $ 3,954,332
Add reinsurance on loss and loss expense reserves 25,326   46,023          
Ending gross loss and loss expense reserves (30,127)   4,000,355          
Policyholder Benefits and Claims Incurred, Ceded 123   21,189          
Net Incurred RMBS Subrogation Recoveries (56,928)   (62,451)          
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         $ 185   $ 339 $ (47)
Euro Member Countries, Euro                
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]                
Ending gross loss and loss expense reserves $ 2,475 € 2,131 $ 21,142 € 17,891