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Financial Guarantee Insurance Contracts - Additional Information (Detail)
€ in Thousands, £ in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2018
EUR (€)
Sep. 30, 2018
GBP (£)
Jun. 30, 2018
USD ($)
Sep. 30, 2017
EUR (€)
Sep. 30, 2017
GBP (£)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Insurance [Line Items]                        
Estimated Future Premium Payments Weighted Average Discounted Rate 2.80%   2.80%   2.50% 2.80% 2.80%          
Weighted average period of future premiums     8 years 8 months 12 days   9 years 9 months 18 days              
Subrogation recoveries, net of reinsurance $ (1,749,808)   $ (1,749,808)   $ (1,806,736)              
Possible Increase in Loss Reserves Related to Puerto Rico 1,190,000   1,190,000                  
Successor [Member]                        
Insurance [Line Items]                        
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation 1,776,248   1,776,248   1,834,387              
Financial Guarantee Insurance Contracts, Premium Receivable 517,197 $ 601,757 517,197 $ 601,757 586,312             $ 661,337
Reinsurance Payable 34,306   $ 34,306   $ 37,876              
Transactions with non-investment grade internal ratings     21.00%   22.00%              
Uncollectable premium receivables 8,027   $ 8,027   $ 9,331              
Past due premiums on policies insuring non-investment grade obligations amount 1,500   1,500                  
Accelerated premium revenue for retired obligations 6,751 26,178 22,246 55,648                
Reinsurance recoveries of losses included in losses and loss expenses     (123) (21,189)                
Losses and loss expense reserves ceded to reinsurers 25,326 46,023 25,326 46,023 40,658             30,767
Intangible amortization expense 26,421 45,690 78,299 116,686                
Intangible Assets, Gross (Excluding Goodwill)   1,562,753   1,562,753 1,581,156              
Insurance intangible asset 755,734   755,734   846,973              
Accumulated amortization on insurance intangible asset 807,019   807,019   734,183              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 1,798,809 1,772,137 1,798,809 1,772,137 $ 1,645,258     $ 2,063,921     $ 1,938,213 $ 1,978,024
Stockholders Equity After Possible Increase in Domestic Public Finance Loss Reserves 608,809   608,809                  
Premiums Paid on Past Due Non Investment Grade Obligations 1,100   $ 1,100                  
Loss Reserves [Member]                        
Insurance [Line Items]                        
Weighted average risk-free rate used to discount loss reserves     3.10%   2.50%              
United Kingdom, Pounds                        
Insurance [Line Items]                        
Financial Guarantee Insurance Contracts, Premium Receivable 136,925 153,964 $ 136,925 153,964     £ 104,988     £ 114,847    
Euro Member Countries, Euro                        
Insurance [Line Items]                        
Financial Guarantee Insurance Contracts, Premium Receivable $ 32,613 $ 36,815 32,613 $ 36,815   € 28,085     € 31,154      
Commonwealth of Puerto Rico [Member]                        
Insurance [Line Items]                        
Domestic Public Finance Losses     $ 41,939