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Income Taxes - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 8 Months Ended 4 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2013
Apr. 30, 2013
Dec. 31, 2012
Dec. 31, 2013
Successor Ambac [Member]
Apr. 30, 2013
Successor Ambac [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Dec. 31, 2011
Predecessor Ambac [Member]
Dec. 31, 2013
United States [Member]
Dec. 31, 2013
United Kingdom [Member]
Dec. 31, 2013
U. S. Federal Net Operating Tax [Member]
Dec. 31, 2013
AFG [Member]
Apr. 30, 2013
Ambac [Member]
Dec. 31, 2010
Ambac [Member]
Apr. 30, 2013
Segregated Account [Member]
Tax Credit Carryforward [Line Items]                                
Operating loss carryforward   $ 6,220,353,000               $ 605,441,000 $ 297,919,000   $ 1,396,673,000      
Net operating tax carryforward   270,321,000                   5,316,993,000        
Expiration period   Expiring in 2029, and will fully expire in 2034                            
Operating tax carryforward expiration year start   2029                            
Operating tax carryforward expiration year end   2034                            
Payment to settle the IRS dispute and related proceedings                           1,900,000   100,000,000
Loss carry forwards exceed                             3,400,000,000  
Excess amount of loss carryforward relinquishment                             1,059,988,000  
Reduction of NOL due to bankruptcy   816,380,000                            
Unrecognized tax benefits   0 0 96,900,000         96,900,000 96,900,000              
Interest expense recognized         0   0 0                
Interest accrued   0 0 0                        
Federal obligation liability $ 3,650,000,000                              
Federal income tax liability rate 25.00%