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Commitments and Contingencies - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended
May 31, 2011
Sep. 30, 2012
Jun. 04, 2012
Sep. 30, 2012
IRS [Member]
Feb. 24, 2012
IRS [Member]
Sep. 30, 2012
Cash [Member]
Memorandum of Understanding   May 4, 2011        
Settlement   $ 24,600,000   $ 100,000,000   $ 2,500,000
Settlement of the claims of the putative plaintiff classes   27,100,000        
Ambac Assurance's payment under a swap termination surety bond   4,524,000        
Total par value of repurchased surplus notes     789,000,000      
Principal amount of surplus notes   939,179,000 188,000,000      
IRS claim in the Bankruptcy Court 807,244,000          
Payment to settle the IRS dispute and related proceedings   807,244,000   1,900,000 1,900,000  
Loss carry-forwards   $ 3,400,000        
Payment by subsidiary associated with NOL Usage Tier C   12.50%        
Payment by subsidiary associated with NOL Usage Tier D   17.50%