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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
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Feb. 12, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Loss And Loss Adjustment Expense Reserves [Line Items]                    
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) $ (15,491)   $ 28,939   $ (77,578)          
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims (223,613)   513,186   (11,489)          
Ceded Loss And Loss Expenses Paid Not Yet Recovered           $ 510   $ 339 $ (349)  
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation           (1,770,546)   (1,834,387)    
Policyholder Benefits and Claims Incurred, Ceded (1,657)   20,348   (5,421)          
Net Incurred RMBS Subrogation Recoveries (62,493)   (72,003)   71,369          
satisfaction and discharge of segregated account deferred amounts             $ 3,000,158      
satisfaction and discharge of segregated account deferred interest amounts             856,834      
Loss and Loss Expense Benefit on Settled Deferred Amounts             $ 288,204      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]                    
Beginning gross loss and loss expense reserves 4,113,802   3,696,038   2,858,813          
Less reinsurance on loss and loss expense reserves 40,658   30,767   44,059          
Beginning balance of net loss and loss expense reserves 4,073,144   3,665,271   2,814,754          
Current year:                    
Claim and loss expense payments, net of subrogation and reinsurance (204)   (825)   (5,371)          
Prior years:                    
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance (3,963,341)   (133,427)   944,955          
Liability for Unpaid Claims and Claims Adjustment Expense, Net 4,073,144   3,665,271   2,814,754 (129,505)   4,073,144 3,665,271 $ 2,814,754
Add reinsurance on loss and loss expense reserves 22,623   40,658   30,767          
Ending gross loss and loss expense reserves (106,882)   4,113,802   3,696,038          
Balance Of Rmbs Subrogation Recoveries Net Of Reinsurance           (1,744,243)   (1,806,736)    
Current Year Claims and Claims Adjustment Expense 4,884   5,691   6,675          
Prior Year Claims and Claims Adjustment Expense (228,497)   507,495   (18,164)          
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid 3,963,545   134,252   (939,584)          
Euro Member Countries, Euro                    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]                    
Beginning gross loss and loss expense reserves 21,116 € 17,582 21,375 € 20,297            
Prior years:                    
Ending gross loss and loss expense reserves $ 3,328 € 2,905 $ 21,116 € 17,582 $ 21,375          
Random Samples [Member]                    
Loss And Loss Adjustment Expense Reserves [Line Items]                    
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation           $ (1,770,546)   $ (1,834,387) $ (1,907,035) $ (2,829,575)