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Fresh Start Financial Statement Reporting - Schedule of Calculation of Pre-Tax Gain, Recorded as Reorganization on Consolidated Statement of Total Comprehensive Income (Parenthetical) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | Sep. 30, 2013 | Apr. 30, 2013
--- | --- | ---
Extinguishment of Debt [Line Items] |  |
Partial discharge of par value of Segregated Account junior surplus notes |  | $ 8,043
Enterprise value | 185,000 | 185,000
Common stock, shares issued | 45,000,000 |
Common stock par value | $ 0.01 |
Number of warrants issued | 5,047,138 |
Successor Ambac [Member] |  |
Extinguishment of Debt [Line Items] |  |
Common stock | 450 |
Common stock, shares issued | 45,002,524 | 45,000,000
Common stock par value | $ 0.01 |
Additional paid-in capital | 184,566 |
Number of warrants issued |  | 5,047,138
Common Stock Successor Ambac [Member] | Reorganization Items Adjustments [Member] |  |
Extinguishment of Debt [Line Items] |  |
Common stock |  | 450
Common stock, shares issued |  | 45,000,000
Common stock par value |  | $ 0.01
Additional Paid-In Capital Successor [Member] | Reorganization Items Adjustments [Member] |  |
Extinguishment of Debt [Line Items] |  |
Additional paid-in capital |  | 184,550
Additional paid-in capital allocated to warrants |  | 11,437
Additional paid-in capital attributable to common stock |  | $ 173,113

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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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