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Background and Business Description - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Mar. 15, 2012
Background And Basis Of Presentation [Line Items]      
Current cash and investments $ 30,357    
Net par exposure for policies allocated to the segregated account 27,162,620    
Tax refunds received 38,486    
Interest on the secured note accrues 4.50%    
Available secured notes including capitalized interest 470,498    
Minimum surplus amount 100,000    
Insurance liabilities allocated to segregated account 6,245,484    
Segregated Account's insurance liabilities 163,687    
Percentage of permitted policy claim 25.00%    
Outstanding Segregated Account Surplus Notes 53,000    
Amount shall have been paid or paid into escrow by the company     30,000
Reduction in NOLs rate (1.10%) 0.20%  
Beneficial ownership of company common stock held by external investor shares 13,500,000    
Percentage of stock value of reorganized company 4.50%    
Ownership of senior debt securities by a holder 56,930    
Internal Revenue Service (IRS) [Member]
      
Background And Basis Of Presentation [Line Items]      
Minimum payment to IRS 100,000    
Reduction in NOLs rate 10.00%    
Ambac Assurance [Member]
      
Background And Basis Of Presentation [Line Items]      
Issuance of secured note to segregated account 2,000,000    
Secured note maturity year 2050    
Interest on the secured note accrues 4.50%    
Ambac [Member]
      
Background And Basis Of Presentation [Line Items]      
Shareholders ownership interest 5.00%    
Increase in ownership percentage, by value 50.00%    
Increase in ownership percentage, rolling period beginning with the last Ownership Change Three-year    
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    
5.1% junior surplus notes, segregated account, due 2020 [Member] | OSS Settlement Agreement [Member]
      
Background And Basis Of Presentation [Line Items]      
Segregated Account issue of junior surplus notes $ 36,082