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Financial Guarantee Insurance Contracts - Additional Information (Detail)
£ in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
GBP (£)
Dec. 31, 2017
GBP (£)
Dec. 31, 2016
GBP (£)
Dec. 31, 2015
USD ($)
Insurance [Line Items]                              
Net par amount of financial guarantees $ 46,927,000       $ 62,716,000       $ 46,927,000 $ 62,716,000          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 1,633,147       $ 1,645,258       1,633,147 $ 1,645,258 $ 1,978,024       $ 1,958,346
Stockholders Equity After Possible Increase in Domestic Public Finance Loss Reserves 633,147               633,147            
Possible Increase in Domestic Public Finance Loss Reserves $ 1,000,000               $ 1,000,000            
Estimated Future Premium Payments Weighted Average Discounted Rate 2.70%       2.50%       2.70% 2.50%   2.70% 2.50%    
Ceded Loss And Loss Expenses Paid Not Yet Recovered $ 510       $ 339       $ 510 $ 339 (349)        
Financial Guarantee Insurance Contracts, Premium Receivable 495,391       586,312       495,391 586,312 661,337       831,575
Amount Of Insured Par Outstanding Ceded To Reinsurer 3,076,000               $ 3,076,000            
Ceded Principal Outstanding Major Reinsurer Percentage                 5.90%            
Financial Guarantee Gross Outstanding Principal Assumed From Third Parties 219,100       219,100       $ 219,100 219,100          
Deferred Ceded Premiums And Reinsurance Recoverables 84,267               84,267            
Reinsurance Payable 32,913       37,876       $ 32,913 $ 37,876          
Accrued rate of interest on outstanding policy obligations (percent)                   5.10%          
Weighted average period of future premiums                 8 years 8 months 9 years 9 months 18 days          
Uncollectable premium receivables 7,136       9,331       $ 7,136 $ 9,331          
Accelerated premium revenue for retired obligations                 32,482 64,494 52,416        
Reinsurance recoveries of losses included in losses and loss expenses                 1,657 (20,348) 5,421        
Losses and loss expense reserves ceded to reinsurers 22,623       40,658       22,623 40,658 30,767       $ 44,059
Subrogation recoveries, net of reinsurance (1,744,243)       (1,806,736)       (1,744,243) (1,806,736)          
Intangible amortization expense 28,982 $ 26,421 $ 23,242 $ 28,636 34,168 $ 45,690 $ 33,471 $ 37,525 107,281 150,854 174,608        
Intangible Assets, Gross (Excluding Goodwill) 1,551,576       1,581,156       1,551,576 1,581,156          
Finite-Lived Intangible Assets, Accumulated Amortization 832,645       734,183       832,645 734,183          
Insurance intangible asset 718,931       846,973       718,931 846,973          
Letters of Credit Outstanding, Amount 114,294               114,294            
Financial Guarantee Outstanding Principal Ceded To Third Parties 5,128,000               5,128,000            
Premiums Past Due On Non Investment Grade Obligations 100               100            
Insurance Intangible Asset [Member]                              
Insurance [Line Items]                              
Intangible amortization expense                 $ 107,281 $ 150,854 174,608        
Loss Reserves [Member]                              
Insurance [Line Items]                              
Weighted average risk-free rate used to discount loss reserves                 2.80% 2.50%          
United Kingdom, Pounds                              
Insurance [Line Items]                              
Financial Guarantee Insurance Contracts, Premium Receivable 131,458       151,852       $ 131,458 $ 151,852 $ 177,878 £ 103,088 £ 112,342 £ 144,393  
Ambac UK [Member]                              
Insurance [Line Items]                              
Total Benefit Related to Ballantyne Settlement                   144,600          
Commonwealth of Puerto Rico [Member]                              
Insurance [Line Items]                              
Domestic Public Finance Losses                 36,674            
Public Finance [Member]                              
Insurance [Line Items]                              
Net par amount of financial guarantees 23,442,000       32,088,000       23,442,000 32,088,000          
Housing Revenue [Member] | Public Finance [Member]                              
Insurance [Line Items]                              
Net par amount of financial guarantees 6,159,000       6,312,000       6,159,000 6,312,000          
Housing Revenue [Member] | Military Housing [Domain] | Public Finance [Member]                              
Insurance [Line Items]                              
Net par amount of financial guarantees $ 5,759,000       $ 5,829,000       $ 5,759,000 $ 5,829,000