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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Balance Sheet (Parenthetical) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2013
Apr. 30, 2013
Dec. 31, 2012
Condensed Balance Sheet Statements, Captions [Line Items]      
Preferred stock, par value   $ 0.01  
Preferred stock, authorized shares   20,000,000  
Common stock, par value $ 0.01 $ 0.01  
Common stock, shares authorized   130,000,000  
Common stock, shares issued 45,000,000 45,000,000  
Successor Ambac [Member]
      
Condensed Balance Sheet Statements, Captions [Line Items]      
Fixed income securities, amortized cost $ 5,927,254    
Preferred stock, par value $ 0.01    
Preferred stock, authorized shares 20,000,000    
Preferred stock, shares issued 0    
Preferred stock, shares outstanding 0    
Common stock, par value $ 0.01    
Common stock, shares authorized 130,000,000    
Common stock, shares issued 45,003,461 45,000,000  
Common stock, shares outstanding 45,003,461    
Treasury stock, shares 937   0
Predecessor Ambac [Member]
      
Condensed Balance Sheet Statements, Captions [Line Items]      
Fixed income securities, amortized cost     4,751,824
Preferred stock, par value     $ 0.01
Preferred stock, authorized shares     4,000,000
Preferred stock, shares issued     0
Preferred stock, shares outstanding     0
Common stock, par value     $ 0.01
Common stock, shares authorized     650,000,000
Common stock, shares issued     308,016,674
Common stock, shares outstanding     308,016,674
Treasury stock, shares     5,580,657
Ambac Financial Group, Inc Parent Company Only [Member] | Successor Ambac [Member]
      
Condensed Balance Sheet Statements, Captions [Line Items]      
Fixed income securities, amortized cost $ 28,149    
Preferred stock, par value $ 0.01    
Preferred stock, authorized shares 20,000,000    
Preferred stock, shares issued 0    
Preferred stock, shares outstanding 0    
Common stock, par value $ 0.01    
Common stock, shares authorized 130,000,000    
Common stock, shares issued 45,003,461    
Common stock, shares outstanding 45,003,461    
Treasury stock, shares 937    
Ambac Financial Group, Inc Parent Company Only [Member] | Predecessor Ambac [Member]
      
Condensed Balance Sheet Statements, Captions [Line Items]      
Preferred stock, par value     $ 0.01
Preferred stock, authorized shares     4,000,000
Preferred stock, shares issued     0
Preferred stock, shares outstanding     0
Common stock, par value     $ 0.01
Common stock, shares authorized     650,000,000
Common stock, shares issued     308,016,674
Common stock, shares outstanding     308,016,674
Treasury stock, shares     5,580,657