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Segment Information - Summary of Financial Information by Reportable Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Revenues:        
Unaffiliated customers $ 197,162 $ 25,717 $ 515,337 $ 377,195
Total revenues before expenses and reorganization items 197,162 25,717 515,337 377,195
Pre-tax loss from continuing operations:        
Unaffiliated customers 158,040 (498) (401,899) (919,270)
Pre-tax income (loss) from continuing operations 158,040 (498) (401,899) (919,270)
Total assets 26,947,892 27,626,582 26,947,892 27,626,582
Financial Guarantee [Member]
        
Revenues:        
Unaffiliated customers 230,014 232,845 587,506 610,945
Intersegment 1,244 1,088 4,140 25,174
Total revenues before expenses and reorganization items 231,258 233,933 591,646 636,119
Pre-tax loss from continuing operations:        
Unaffiliated customers 196,302 221,612 (314,598) (628,260)
Intersegment 2,530 (3,660) 2,845 17,971
Pre-tax income (loss) from continuing operations 198,832 217,952 (311,753) (610,289)
Total assets 26,206,822 26,349,572 26,206,822 26,349,572
Financial Services [Member]
        
Revenues:        
Unaffiliated customers (33,021) (207,190) (72,451) (233,961)
Intersegment (1,197) (1,022) (3,986) (24,963)
Total revenues before expenses and reorganization items (34,218) (208,212) (76,437) (258,924)
Pre-tax loss from continuing operations:        
Unaffiliated customers (35,434) (211,852) (80,021) (248,159)
Intersegment (1,897) (465) (3,681) (22,619)
Pre-tax income (loss) from continuing operations (37,331) (212,317) (83,702) (270,778)
Total assets 703,945 1,220,087 703,945 1,220,087
Corporate and Other [Member]
        
Revenues:        
Unaffiliated customers 169 62 282 211
Intersegment   2,883 645 2,883
Total revenues before expenses and reorganization items 169 2,945 927 3,094
Pre-tax loss from continuing operations:        
Unaffiliated customers (2,828) (10,258) (7,280) (42,851)
Intersegment (633) 3,955 836 4,648
Pre-tax income (loss) from continuing operations (3,461) (6,303) (6,444) (38,203)
Total assets 37,125 56,923 37,125 56,923
Intersegment Elimination [Member]
        
Revenues:        
Intersegment (47) (2,949) (799) (3,094)
Total revenues before expenses and reorganization items (47) (2,949) (799) (3,094)
Pre-tax loss from continuing operations:        
Intersegment   170    
Pre-tax income (loss) from continuing operations   $ 170