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Special Purpose Entities, Including Variable Interest Entities - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Apr. 01, 2011
Sep. 30, 2012
Asset Backed Securities and Utility Obligations [Member]
Sep. 30, 2012
Sponsored Variable Interest Entities [Member]
Transactions
Dec. 31, 2011
Sponsored Variable Interest Entities [Member]
Sep. 30, 2012
Financial Guarantee [Member]
Sep. 30, 2011
Financial Guarantee [Member]
Sep. 30, 2012
Financial Guarantee [Member]
Sep. 30, 2011
Financial Guarantee [Member]
Sep. 30, 2012
Variable Interest Entity [Member]
Dec. 31, 2011
Variable Interest Entity [Member]
Sep. 30, 2012
Consolidated Entities [Member]
Entity
Dec. 31, 2011
Consolidated Entities [Member]
Entity
Sep. 30, 2012
Unconsolidated Variable Interest Entities [Member]
Sep. 30, 2011
Unconsolidated Variable Interest Entities [Member]
Sep. 30, 2012
Unconsolidated Variable Interest Entities [Member]
Sep. 30, 2011
Unconsolidated Variable Interest Entities [Member]
Variable Interest Entities [Line Items]                                          
Debt outstanding to third parties under this secured borrowing transaction                           $ 20,468 $ 35,600            
Securities fair value 194,172   194,172   172,880                 194,172 172,880            
Fair value of special purpose entities 15,021   15,021   16,779                                
Change in fair value of special purpose entities (771) (1,119) (1,758) (577)                                  
Number of individual transactions with special purpose entities               15                          
Number of transactions were outstanding with special purpose entities               5                          
Total principal amount of debt outstanding               572,352 578,562                        
Weighted average life             8 years 1 month 6 days                            
Earned fees for providing other services under its financial guarantee policies                   10 12 32 35                
Income (loss) on variable interest entities                                   0 0 0 0
Earned premiums for issuing the financial guarantee policies on the assets, MTNs and derivative contracts 87 180 342 607                                  
Claims on insurance policies issued to these entities 4,846 5,417 14,691 5,589                                  
Amount received under derivative contracts 360 170 3,387 3,905                                  
Number Of Consolidated Variable Interest Entities                               18 19        
Consolidated VIE assets 17,357,709   17,357,709   16,543,207                                
VIE - Derivative liabilities, Fair value 17,175,143   17,175,143   16,379,386                                
Average rating of assets held by sponsored special purpose entities     no longer than 90 days                                    
Intangible assets recorded at fair value           326,342                              
Accumulated amortization on the intangible assets   0   0                                  
Amortization expense for intangible assets   5,708   13,870                                  
Weighted average amortization period     28 years                                    
Gross carrying amount of intangible assets 254,163   254,163                                    
Impairment charge   $ 58,309   $ 58,309