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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 |

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