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Special Purpose Entities, Including Variable Interest Entities - Additional Information (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Transactions
Entity
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Entity
Variable Interest Entities [Line Items]        
Equity Method Investments   $ 28,810   $ 25,339
Number of RMBS Sold     17  
Cash Received From Delaware Trust $ 146,000      
Number of VIEs AAC Transferred Assets To   2    
Number of VIEs Liquidated   1    
Secured Debt   $ 106,284    
Par Value of Securities Placed in Trust   342,294    
Fair Value of Securities Placed in Trust   369,127   396,100
Securities Issued by Delaware Trust $ 146,000      
Fair value of special purpose entities   7,729   8,696
Consolidated VIE assets   14,385,229   14,288,497
Consolidated VIE liabilities   $ 14,238,493   14,259,776
Asset-Backed Securities and Utility Obligations [Member]        
Variable Interest Entities [Line Items]        
Weighted average life   5 years 10 months 15 days    
Average rating of assets held by sponsored special purpose entities   BBB+    
Sponsored Variable Interest Entities [Member]        
Variable Interest Entities [Line Items]        
Number of individual transactions with special purpose entities | Transactions   15    
Number of transactions outstanding with special purpose entities | Transactions   3    
Total principal amount of debt outstanding   $ 412,750   $ 465,160
Consolidated Entities [Member]        
Variable Interest Entities [Line Items]        
Number of DeConsolidated Variable Interest Entities 1   2  
Number of consolidated Variable Interest Entities | Entity   13   13
variable interest entities deconsolidation gain loss $ 572   $ 572  
Ambac UK [Member]        
Variable Interest Entities [Line Items]        
Number of consolidated Variable Interest Entities | Entity   8    
Consolidated VIE assets   $ 13,939,377   $ 13,769,985
Consolidated VIE liabilities   $ 13,813,682   $ 13,636,628
Ambac Assurance [Member]        
Variable Interest Entities [Line Items]        
Number of consolidated Variable Interest Entities | Entity       7
London Interbank Offered Rate (LIBOR) [Member]        
Variable Interest Entities [Line Items]        
Interest Rate on Securities Issued by Delaware Trust   2.80%