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Net Income Per Share - Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share (Detail) | 2 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended
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Jun. 30, 2013 Successor Ambac [Member] | Jun. 30, 2013 Successor Ambac [Member] Warrants [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Jun. 30, 2012 Predecessor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Jun. 30, 2012 Predecessor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Restricted Stock Units [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Restricted Stock Units [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Restricted Stock Units [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Restricted Stock Units [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Stock Options [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Stock Options [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Stock Options [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Stock Options [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Warrants [Member] | Jun. 30, 2012 Predecessor Ambac [Member] Warrants [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Warrants [Member] | Jun. 30, 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 | 45,000,653 |  | 302,469,626 | 302,469,196 | 302,469,544 | 302,467,762 |  |  |  |  |  |  |  |  |  |  |  |
Effect of potential dilutive shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of potential dilutive shares |  | 1,575,064 |  |  |  |  | 109,593 |  | 109,701 |  |  |  |  |  |  |  |  |
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share | 46,575,717 |  | 302,579,219 | 302,469,196 | 302,579,245 | 302,467,762 |  |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive shares excluded from the above reconciliation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive shares excluded from reconciliation |  |  |  |  |  |  |  | 71,296 |  | 72,060 | 461,150 | 850,308 | 475,550 | 868,990 |  |  |  |

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