Net Income Per Share - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Apr. 30, 2013
Schedule Of Earnings Per Share [Line Items]
Number of new common stock issued	45,003,512	45,003,461
Par value of common stock issued	$ 0.01	$ 0.01	$ 0.01
Number of shares exercisable for warrants			5,047,138
Exercise price of common stock	16.67
Expiry date of warrants	Apr. 30, 2023
Warrant exercised	51
Common stock shares issued	51
Successor Ambac [Member]
Schedule Of Earnings Per Share [Line Items]
Number of new common stock issued			45,000,000
Number of warrants issued			5,047,138
Warrants outstanding	5,040,775