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Special Purpose Entities, Including Variable Interest Entities - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Variable Interest Entities [Line Items]    
Securities fair value $ 201,329 $ 172,880
Fair value of special purpose entities 14,557 16,779
Earned premiums for issuing the financial guarantee policies on the assets, MTNs and derivative contracts 398 764
Assets sold to special purpose entities 0 0
Claims on insurance policies issued to these entities 14,691 5,768
Amount received under derivative contracts 7,356 8,039
Consolidated VIE assets 17,841,863 16,543,207
Consolidated VIE liabilities 17,661,700 16,379,386
Average rating of assets held by sponsored special purpose entities No longer than 90 days  
Asset-backed securities and utility obligations [Member]
    
Variable Interest Entities [Line Items]    
Weighted average life 8 years 8 months 12 days  
Other Assets [Member]
    
Variable Interest Entities [Line Items]    
Change in fair value of special purpose entities (2,222) (1,130)
Sponsored Variable Interest Entities [Member]
    
Variable Interest Entities [Line Items]    
Number of individual transactions with special purpose entities 15  
Number of transactions outstanding with special purpose entities 4  
Total principal amount of debt outstanding 466,938 578,562
National Public Finance Guarantee Corporation [Member]
    
Variable Interest Entities [Line Items]    
Earned fees for providing other services under its financial guarantee policies 37 46
Variable interest entity [Member]
    
Variable Interest Entities [Line Items]    
Debt outstanding to third parties under secured borrowing transaction 14,588 35,600
Securities fair value $ 201,329 $ 172,880
Consolidated entities [Member]
    
Variable Interest Entities [Line Items]    
Number of consolidated Variable Interest Entities 18 19