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Net Income Per Share - Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share (Detail) | 8 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended
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Dec. 31, 2013 Successor Ambac [Member] | Dec. 31, 2013 Successor Ambac [Member] Restricted Stock Units (RSUs) [Member] | Dec. 31, 2013 Successor Ambac [Member] Stock Options [Member] | Dec. 31, 2013 Successor Ambac [Member] Warrants [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Dec. 31, 2012 Predecessor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Restricted Stock Units (RSUs) [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Restricted Stock Units (RSUs) [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Stock Options [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Stock Options [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Warrants [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares used for basic earnings per share | 45,003,925 |  |  |  | 302,469,544 | 302,468,867 |  |  |  |  |  |
Effect of potential dilutive shares: |  |  |  |  |  |  |  |  |  |  |  |
Effect of potential dilutive shares |  | 1,189 |  | 1,297,620 |  |  | 109,701 |  |  |  |  |
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share | 46,302,734 |  |  |  | 302,579,245 | 302,468,867 |  |  |  |  |  |
Anti-dilutive shares excluded from reconciliation |  |  | 855 |  |  |  |  | 71,295 | 475,550 | 805,999 |  |

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