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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 $) | Dec. 31, 2014 | Dec. 31, 2013 | Apr. 30, 2013
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Extinguishment of Debt [Line Items] |  |  |
Enterprise value |  |  | $ 185,000,000 ambc_PlanOfReorganizationEnterpriseValue
Common stock |  |  | 450,000 us-gaap_CommonStockValue
Common stock, shares issued | 45,005,932 us-gaap_CommonStockSharesIssued | 45,003,461 us-gaap_CommonStockSharesIssued | 45,000,000 us-gaap_CommonStockSharesIssued
Common stock, par value | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Additional paid-in capital |  |  | 184,550,000 us-gaap_AdditionalPaidInCapital
Additional paid-in capital allocated to warrants |  |  | 11,437 ambc_AdditionalPaidInCapitalWarrants
Number of warrants issued |  |  | 5,047,138 ambc_ClassOfWarrantIssued
Additional paid-in capital attributable to common stock |  |  | 173,113 us-gaap_AdditionalPaidInCapitalCommonStock
Successor [Member] |  |  |
Extinguishment of Debt [Line Items] |  |  |
Common stock | 450,000 us-gaap_CommonStockValue / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 450,000 us-gaap_CommonStockValue / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 450,000 us-gaap_CommonStockValue / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Common stock, shares issued |  |  | 45,000,000 us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Additional paid-in capital | $ 189,138,000 us-gaap_AdditionalPaidInCapital / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 185,672,000 us-gaap_AdditionalPaidInCapital / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |

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- Definition Class Of Warrant Issued + References No definition available. + Details
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- Definition Plan Of Reorganization Enterprise Value + References No definition available. + Details
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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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- Definition Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital. + 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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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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