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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