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Net Income Per Share - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2014 | Dec. 31, 2013 | Apr. 30, 2013
Schedule Of Earnings Per Share [Line Items] |  |  |  |
Number of new common stock issued | 45,004,410 | 45,004,410 | 45,003,461 |
Par value of common stock issued | $ 0.01 | $ 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 | 898 | 949 |  |
Common stock shares issued |  | 949 |  |
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 | 5,039,877 | 5,039,877 |  |

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