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Segment Information - Summary of Financial Information by Reportable Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Revenues:    
Unaffiliated customers $ 685,689 $ 295,764
Total revenues before expenses and reorganization items 685,689 295,764
Pre-tax loss from continuing operations:    
Unaffiliated customers (256,505) (1,882,949)
Pre-tax loss from continuing operations (256,505) (1,882,949)
Total assets 27,007,164 27,113,695
National Public Finance Guarantee Corporation [Member]
    
Revenues:    
Unaffiliated customers 758,331 546,525
Intersegment 5,189 26,481
Total revenues before expenses and reorganization items 763,520 573,006
Pre-tax loss from continuing operations:    
Unaffiliated customers (166,761) (1,558,768)
Intersegment 580 13,041
Pre-tax loss from continuing operations (166,181) (1,545,727)
Total assets 26,519,480 25,935,817
Financial Services [Member]
    
Revenues:    
Unaffiliated customers (72,977) (251,044)
Intersegment (4,992) (26,205)
Total revenues before expenses and reorganization items (77,969) (277,249)
Pre-tax loss from continuing operations:    
Unaffiliated customers (83,015) (269,580)
Intersegment (5,775) (23,397)
Pre-tax loss from continuing operations (88,790) (292,977)
Total assets 455,427 1,133,438
Corporate and Other [Member]
    
Revenues:    
Unaffiliated customers 335 283
Intersegment 645 7,386
Total revenues before expenses and reorganization items 980 7,669
Pre-tax loss from continuing operations:    
Unaffiliated customers (6,729) (54,601)
Intersegment (5,195) 10,356
Pre-tax loss from continuing operations (1,534) (44,245)
Total assets 32,257 44,440
Intersegment Elimination [Member]
    
Revenues:    
Intersegment (842) (7,662)
Total revenues before expenses and reorganization items $ (842) $ (7,662)