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Net Income Per Share - Additional Information (Detail) (USD $)
 2 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Apr. 30, 2013
Schedule Of Earnings Per Share [Line Items]      
Number of new common stock issued 45,000,000 45,000,000  
Par value of common stock issued $ 0.01 $ 0.01 $ 0.01
Number of warrants issued 5,047,138 5,047,138  
Number of shares exercisable for warrants 5,047,138 5,047,138  
Exercise price of common stock 16.67 16.67  
Expiry date of warrants   Apr. 30, 2023  
Warrant exercised 6,244    
Common stock shares issued 2,456    
Successor Ambac [Member]
      
Schedule Of Earnings Per Share [Line Items]      
Number of new common stock issued 45,002,456 45,002,456 45,000,000
Par value of common stock issued $ 0.01 $ 0.01  
Number of warrants issued     5,047,138
Warrants outstanding 5,040,894 5,040,894