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Background and Business Description - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Nov. 17, 2010
5.1% junior surplus notes, segregated account, due 2020 [Member]
Mar. 31, 2013
General unsecured claims [Member]
Mar. 31, 2013
Subordinated debt securities [Member]
May 01, 2013
Subsequent Event [Member]
May 01, 2013
Subsequent Event [Member]
Bankruptcy [Member]
Apr. 30, 2013
Subsequent Event [Member]
Internal Revenue Service [Member]
Apr. 30, 2013
Subsequent Event [Member]
Segregated Account [Member]
May 01, 2013
Subsequent Event [Member]
Senior debt securities [Member]
Bankruptcy [Member]
May 01, 2013
Subsequent Event [Member]
General unsecured claims [Member]
May 01, 2013
Subsequent Event [Member]
General unsecured claims [Member]
Bankruptcy [Member]
May 01, 2013
Subsequent Event [Member]
Subordinated debt securities [Member]
May 01, 2013
Subsequent Event [Member]
Subordinated debt securities [Member]
Bankruptcy [Member]
Mar. 31, 2013
Ambac Assurance [Member]
Background And Basis Of Presentation [Line Items]                              
Settlement disputes               $ 1,900 $ 100,000            
Common stock, shares issued             45,000,000     43,946,750   378,250   675,000  
Common stock, value 3,080 3,080               1,246,129   14,328   444,183  
Shares reserved for future issuance                     10,000        
Warrants issued                     42,424   5,004,714    
Warrants issued exercise price       $ 16.67 $ 16.67                    
Amount transferred to escrow account           30,000                  
Segregated Account issue of junior surplus notes     350,000                        
Capital stock, shares authorized           150,000,000                  
Common stock, shares authorized           130,000,000                  
Common stock, par value           $ 0.01                  
Preferred stock, shares authorized           20,000,000                  
Preferred stock, par value           $ 0.01                  
Percentage of voting rights, common stock 10.00%                            
Beneficial ownership 5.00%                            
Existing beneficial ownership 5.00%                            
Net par exposure for policies allocated to the Segregated Account 26,122,693                            
Issuance of secured note to segregated account                             2,000,000
Secured note maturity year                             2050
Interest on the secured note accrues                             4.50%
Available secured notes including capitalized interest 358,568                            
Minimum surplus amount 100,000                            
Insurance liabilities allocated to segregated account 6,211,471                            
Segregated Account's insurance liabilities $ 159,451                            
Percentage of permitted policy claim 25.00%                            
Accrued rate of interest on outstanding policy obligations 5.10%