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Net Income Per Share - Additional Information (Detail) (USD $) | 5 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2013 Successor Ambac [Member] | Apr. 30, 2013 Successor Ambac [Member]
Schedule Of Earnings Per Share [Line Items] |  |  |  |
Number of new common stock issued | 45,000,000 | 45,000,000 | 45,002,524 | 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 |  | 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 | 6,312 |  |  |
Common stock shares issued | 2,524 |  |  |
Warrants outstanding |  |  | 5,040,826 |

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