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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 ($)
Transactions
Entity
Sep. 30, 2015
USD ($)
Transactions
Entity
Dec. 31, 2014
USD ($)
Entity
Variable Interest Entities [Line Items]      
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 1  
Secured Debt $ 137,049 $ 137,049  
Par Value of Securities Placed in Trust 386,129 386,129  
Fair Value of Securities Placed in Trust 403,106 403,106  
Securities Issued by Delaware Trust   146,000  
Fair value of special purpose entities 9,322 9,322 $ 12,036
Consolidated VIE assets 14,875,442 14,875,442 15,126,110
Consolidated VIE liabilities $ 14,830,828 14,830,828 15,085,685
variable interest entities deconsolidation gain loss   $ 572  
Asset-Backed Securities and Utility Obligations [Member]      
Variable Interest Entities [Line Items]      
Weighted average life   6 years 9 months 12 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 15  
Number of transactions outstanding with special purpose entities | Transactions 3 3  
Total principal amount of debt outstanding $ 457,960 $ 457,960 $ 457,960
Consolidated Entities [Member]      
Variable Interest Entities [Line Items]      
Number of DeConsolidated Variable Interest Entities 1 2  
Number of consolidated Variable Interest Entities | Entity 15 15 15
London Interbank Offered Rate (LIBOR) [Member]      
Variable Interest Entities [Line Items]      
Interest Rate on Securities Issued by Delaware Trust   2.80%