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Background and Business Description - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Apr. 30, 2013
Background And Basis Of Presentation [Line Items]    
Common stock, shares issued 45,000,000  
Warrants issued exercise price 16.67  
Amount transferred to escrow account   $ 30,000
Capital stock, shares authorized   150,000,000
Common stock, shares authorized   130,000,000
Common stock, par value $ 0.01 $ 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%  
Available secured notes including capitalized interest 278,706  
Minimum surplus amount 100,000  
Insurance liabilities allocated to segregated account 6,150,172  
Segregated Account's insurance liabilities 393,730  
Percentage of permitted policy claim 25.00%  
Accrued rate of interest on outstanding policy obligations 5.10%  
Bankruptcy [Member]
    
Background And Basis Of Presentation [Line Items]    
Common stock, shares issued   45,000,000
5.1% junior surplus notes, segregated account, due 2020 [Member]
    
Background And Basis Of Presentation [Line Items]    
Segregated Account issue of junior surplus notes   350,000
Senior debt securities [Member] | Bankruptcy [Member]
    
Background And Basis Of Presentation [Line Items]    
Common stock, shares issued   43,946,750
Common stock, value   1,246,129
General unsecured claims [Member]
    
Background And Basis Of Presentation [Line Items]    
Shares reserved for future issuance   10,000
Warrants issued   42,424
Warrants issued exercise price   16.67
General unsecured claims [Member] | Bankruptcy [Member]
    
Background And Basis Of Presentation [Line Items]    
Common stock, shares issued   378,250
Common stock, value   14,328
Subordinated debt securities [Member]
    
Background And Basis Of Presentation [Line Items]    
Warrants issued   5,004,714
Warrants issued exercise price   16.67
Subordinated debt securities [Member] | Bankruptcy [Member]
    
Background And Basis Of Presentation [Line Items]    
Common stock, shares issued   675,000
Common stock, value   444,183
Segregated Account [Member]
    
Background And Basis Of Presentation [Line Items]    
Settlement disputes   100,000
Ambac [Member]
    
Background And Basis Of Presentation [Line Items]    
Settlement disputes   1,900
Ambac Assurance [Member]
    
Background And Basis Of Presentation [Line Items]    
Net par exposure for policies allocated to the Segregated Account 24,718,999  
Issuance of secured note to segregated account $ 2,000,000  
Secured note maturity year 2050  
Interest on the secured note accrues 4.50%