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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
 3 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2017
EUR (€)
Mar. 31, 2016
USD ($)
Mar. 31, 2016
EUR (€)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Successor [Member]              
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]              
Beginning gross loss and loss expense reserves $ 3,696,038   $ 2,858,813        
Less reinsurance on loss and loss expense reserves 30,767   44,059        
Beginning balance of net loss and loss expense reserves 3,665,271   2,814,754        
Current Year Claims and Claims Adjustment Expense 1,543   768        
Prior Year Claims and Claims Adjustment Expense 133,468   (106,049)        
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 135,011   (105,281)        
Claim and loss expense payments, net of subrogation and reinsurance (696)   0        
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance (9,749)   916,206        
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid 10,445   (916,206)        
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Exchange 5,827   (10,081)        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 3,665,271   2,814,754   $ 3,795,664 $ 3,665,271 $ 3,615,598
Add reinsurance on loss and loss expense reserves 34,691   27,478        
Ending gross loss and loss expense reserves 3,830,355   3,643,076        
Policyholder Benefits and Claims Incurred, Ceded (4,112)   (9,454)        
Net Incurred RMBS Subrogation Recoveries (13,797)   20,319        
Ceded Loss And Loss Expenses Paid Not Yet Recovered         $ (418) $ (349) $ (162)
Euro Member Countries, Euro              
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]              
Ending gross loss and loss expense reserves $ 20,984 € 19,639 $ 22,321 € 19,600