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Schedule II - Additional Information (Detail) (USD $)
 8 Months Ended 12 Months Ended 12 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
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
Maximum [Member]
Apr. 30, 2013
Ambac Financial Group, Inc Parent Company Only [Member]
Dec. 31, 2012
Ambac Financial Group, Inc Parent Company Only [Member]
Dec. 31, 2013
Ambac Assurance [Member]
Dec. 31, 2013
Ambac Assurance [Member]
2017 [Member]
Condensed Financial Statements, Captions [Line Items]                    
Date of incorporation   Apr. 29, 1991                
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            
Junior Surplus Note at fair value       167,020,000            
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%                
Voting shares of the emerging entity           50.00%        
Fresh Start Reporting Date   Apr. 30, 2013                
Discontinued Liabilities subject to compromise             239,468,000      
Liabilities subject to compromise contractual interest on debt             $ 27,572,000 $ 85,371,000