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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2014
Earnings Per Share [Abstract] |
Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share | NET INCOME PER SHARE Predecessor Ambac common stock (and related stock options and restricted stock units) was canceled upon emergence from bankruptcy on the Effective Date. Pursuant to the Reorganization Plan, 45,000,000 shares of new common stock at par value of $0.01 per share and 5,047,138 warrants were issued. Warrants entitle such holders to acquire up to 5,047,138 shares of new common stock at an exercise price of $16.67 per share at any time on or prior to April 30, 2023. For the three and nine months ended September 30, 2014, 898 and 949 warrants, respectively, were exercised, resulting in an issuance of 949 shares of common stock for the nine months ended September 30, 2014. As of September 30, 2014, Successor Ambac had 5,039,877 warrants outstanding. The earnings per share information for Predecessor Ambac is not meaningful to investors in Successor Ambac’s common stock and warrants. Basic net income per share is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding and vested restricted stock units. Diluted net income per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding plus all potential dilutive common shares outstanding during the period. All potential dilutive common shares outstanding consider common stock deliverable pursuant to warrants issued under the Reorganization Plan and unvested options, restricted stock units and performance stock units granted under employee and director compensation plans. The following table provides a reconciliation of the common shares used for basic earnings per share to the diluted shares used for diluted earnings per share:
| Period from July 1 |  | Period from July 1
| through |  | through
| September 30, 2014 |  | September 30, 2013
Weighted average number of common shares used for basic earnings per share | 45,115,882 |  |  | 45,002,463 |
Effect of potential dilutive shares: |  |  |
Warrants | 1,469,203 |  |  | 1,352,412 |
Stock options | 8,220 |  |  | — |
Restricted stock units | 31,384 |  |  | — |
Performance stock units | — |  |  | — |
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share | 46,624,689 |  |  | 46,354,875 |
Anti-dilutive shares excluded from the above reconciliation: |  |  |
Warrants | — |  |  | — |
Stock options | — |  |  | — |
Restricted stock units | — |  |  | — |
| Successor Ambac |  |  | Predecessor Ambac
| Period from January 1 |  | Period from May 1 |  |  | Period from January 1
| through |  | through |  |  | through
| September 30, 2014 |  | September 30, 2013 |  |  | April 30, 2013
Weighted average number of common shares used for basic earnings per share | 45,083,831 |  |  | 45,001,741 |  |  |  | 302,469,544 |
Effect of potential dilutive shares: |  |  |  |  |  |
Warrants | 1,892,211 |  |  | 1,443,874 |  |  |  | — |
Stock options | 10,569 |  |  | — |  |  |  | — |
Restricted stock units | 40,473 |  |  | — |  |  |  | 109,701 |
Performance stock units | — |  |  | — |  |  |  | — |
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share | 47,027,084 |  |  | 46,445,615 |  |  |  | 302,579,245 |
Anti-dilutive shares excluded from the above reconciliation: |  |  |  |  |  |
Warrants | — |  |  | — |  |  |  | — |
Stock options | — |  |  | — |  |  |  | 475,550 |
Restricted stock units | — |  |  | — |  |  |  | — |
The following table provides a reconciliation of the common shares used for basic earnings per share to the diluted shares used for diluted earnings per share:
| Period from July 1 |  | Period from July 1
| through |  | through
| September 30, 2014 |  | September 30, 2013
Weighted average number of common shares used for basic earnings per share | 45,115,882 |  |  | 45,002,463 |
Effect of potential dilutive shares: |  |  |
Warrants | 1,469,203 |  |  | 1,352,412 |
Stock options | 8,220 |  |  | — |
Restricted stock units | 31,384 |  |  | — |
Performance stock units | — |  |  | — |
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share | 46,624,689 |  |  | 46,354,875 |
Anti-dilutive shares excluded from the above reconciliation: |  |  |
Warrants | — |  |  | — |
Stock options | — |  |  | — |
Restricted stock units | — |  |  | — |
| Successor Ambac |  |  | Predecessor Ambac
| Period from January 1 |  | Period from May 1 |  |  | Period from January 1
| through |  | through |  |  | through
| September 30, 2014 |  | September 30, 2013 |  |  | April 30, 2013
Weighted average number of common shares used for basic earnings per share | 45,083,831 |  |  | 45,001,741 |  |  |  | 302,469,544 |
Effect of potential dilutive shares: |  |  |  |  |  |
Warrants | 1,892,211 |  |  | 1,443,874 |  |  |  | — |
Stock options | 10,569 |  |  | — |  |  |  | — |
Restricted stock units | 40,473 |  |  | — |  |  |  | 109,701 |
Performance stock units | — |  |  | — |  |  |  | — |
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share | 47,027,084 |  |  | 46,445,615 |  |  |  | 302,579,245 |
Anti-dilutive shares excluded from the above reconciliation: |  |  |  |  |  |
Warrants | — |  |  | — |  |  |  | — |
Stock options | — |  |  | — |  |  |  | 475,550 |
Restricted stock units | — |  |  | — |  |  |  | — |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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