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Special Purpose Entities, Including Variable Interest Entities - Additional Information (Detail)
 6 Months Ended
Jun. 30, 2016
USD ($)
Transactions
Entity
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Entity
Variable Interest Entities [Line Items]      
Equity Method Investments $ 27,620,000   $ 25,339,000
Number of RMBS Sold 17    
Cash Received From Delaware Trust $ 146,000,000    
Number of VIEs AAC Transferred Assets To 2    
Number of VIEs Liquidated 1    
Secured Debt $ 117,641,000    
Par Value of Securities Placed in Trust 355,049,000    
Fair Value of Securities Placed in Trust 376,266,000   396,100,000
Securities Issued by Delaware Trust 146,000,000    
Fair value of special purpose entities 8,687,000   8,696,000
Consolidated VIE assets 13,661,038,000   14,288,497,000
Consolidated VIE liabilities $ 13,506,799,000   14,259,776,000
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 $ 420,760,000   $ 465,160,000
Consolidated Entities [Member]      
Variable Interest Entities [Line Items]      
Number of DeConsolidated Variable Interest Entities 1    
Number of consolidated Variable Interest Entities | Entity 15   15
variable interest entities deconsolidation gain loss   $ 0  
Ambac UK [Member]      
Variable Interest Entities [Line Items]      
Number of consolidated Variable Interest Entities | Entity 8   7
Consolidated VIE assets $ 13,194,359,000   $ 13,769,985,000
Consolidated VIE liabilities $ 13,067,541,000   $ 13,636,628,000
London Interbank Offered Rate (LIBOR) [Member]      
Variable Interest Entities [Line Items]      
Interest Rate on Securities Issued by Delaware Trust 2.80%