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Background and Business Description - Additional Information (Detail) (USD $)
 8 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Segment
Apr. 30, 2013
Dec. 31, 2013
5.1% Junior Surplus Notes, Segregated Account, Due 2020 [Member]
Apr. 30, 2013
General Unsecured Claims [Member]
Dec. 31, 2013
Ambac Assurance [Member]
Dec. 31, 2012
Ambac Assurance [Member]
Dec. 31, 2013
Ambac Assurance [Member]
2017 [Member]
Background And Basis Of Presentation [Line Items]                
Date of incorporation   Apr. 29, 1991            
Number of reportable segments   2            
Reimbursement of operating expenses           $ 5,000,000   $ 4,000,000
Capital stock, shares authorized     150,000,000          
Common stock, shares authorized     130,000,000          
Common stock, par value $ 0.01 $ 0.01 $ 0.01          
Preferred stock, shares authorized     20,000,000          
Preferred stock, par value     $ 0.01          
Common stock, shares issued 45,000,000 45,000,000 45,000,000          
Warrants issued         5,047,138      
Warrants issued exercise price 16.67 16.67     16.67      
Expiry date of warrants   Apr. 30, 2023            
Warrant exercised 6,312 6,312            
Common stock, shares new issues   2,524            
Amount transferred to escrow account 30,000,000 30,000,000            
Segregated Account issue of Junior Surplus Note       350,000,000        
Payment of interest   0            
Percentage of voting rights, common stock   10.00%            
Holder's ownership   5.00%            
Change in holder's ownership 5.00% 5.00%            
Net par exposure for policies allocated to the Segregated Account           22,243,599,000    
Term Of Agreement Termination Notice   Either party may terminate the Management Services Agreement for cause upon 120 days written notice (or such shorter period as the Rehabilitator may determine) and the Segregated Account may terminate without cause at any time upon at least 30 days prior notice.            
Transaction limit under cooperation agreement   5,000,000            
Issuance of secured note to Segregated Account           2,000,000,000    
Secured note maturity year           2050    
Interest on the Secured Note accrues           4.50%    
Available secured notes including capitalized interest           105,989,000    
Minimum Surplus Amount           100,000,000    
Policyholders surplus           $ 840,262,000 $ 100,000,000  
Percentage of permitted policy claim   25.00%            
Accrued rate of interest on outstanding policy obligations 5.10% 5.10%