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Schedule II - Additional Information Schedule II - Additional Information (Detail) - USD ($) | 1 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | May. 01, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Date of incorporation |  |  | Apr. 29, 1991 | Apr. 29, 1991 |  |
Capital stock, shares authorized | 150,000,000 |  |  |  |  |
Common stock, shares authorized | 130,000,000 |  |  |  |  |
Common stock, par value | $ 0.01 |  |  |  |  |
Preferred stock, shares authorized | 20,000,000 |  |  |  |  |
Preferred stock, par value | $ 0.01 |  |  |  |  |
Common stock, shares issued | 45,000,000 |  |  |  |  |
Warrants issued exercise price | $ 16.67 |  |  |  |  |
Amount transferred to escrow account | $ 30,000,000 |  |  |  |  |
Junior surplus note of Ambac Assurance Segregated Account | $ 350,000,000 |  |  |  |  | $ 350,000,000
Percentage of voting rights, common stock |  |  |  | 10.00% |  |
Common Stock Voting Restriction Less One Vote |  |  |  | 10.00% |  |
Holder's ownership |  |  |  | 5.00% |  |
Change in holder's ownership |  |  |  | 5.00% |  |
Voting shares of the emerging entity | 50.00% |  |  |  |  |
Par Value of Owner Trust Certificate |  |  |  | $ 74,794,000 |  |
Par Value of Private Placement |  |  |  | $ 299,175,000 |  |
Private Placement Par Value Proceeds |  |  |  | 80.00% |  |
Private Placement Maturity Date |  |  |  | Aug. 28, 2039 |  |
Interest Rate on Private Placement Obligations |  |  |  | 5.10% |  |
Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Common stock, shares authorized |  |  | 130,000,000 | 130,000,000 |  |
Common stock, par value |  |  | $ 0.01 | $ 0.01 |  |
Preferred stock, shares authorized |  |  | 20,000,000 | 20,000,000 |  |
Preferred stock, par value |  |  | $ 0.01 | $ 0.01 |  |
Common stock, shares issued |  |  | 45,044,222 | 45,005,932 |  |
Ambac Assurance [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Reimbursement of operating expenses | $ 5,000,000 |  |  |  |  |
Ambac Assurance [Member] | 2017 [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Maximum Reimbursement Of Operating Expenses after 2017 | $ 4,000,000 |  |  |  |  |
Successor [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Common stock, shares authorized |  |  | 130,000,000 | 130,000,000 |  |
Common stock, par value |  |  | $ 0.01 | $ 0.01 |  | $ 0.01
Preferred stock, shares authorized |  |  | 20,000,000 | 20,000,000 |  |
Preferred stock, par value |  |  | $ 0.01 | $ 0.01 |  |
Common stock, shares issued |  |  | 45,044,222 | 45,005,932 |  | 45,000,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 5,047,138 |  |  |  |  | 5,047,138
Warrants issued exercise price |  |  |  |  |  | $ 16.67
Stock Issued During Period, Shares, New Issues |  |  | 236 | 949 | 2,524 |
Warrant exercised |  |  | 740 | 949 | 6,312 |
Proceeds from the sale of Junior Surplus Notes of the Segregated Account |  | $ 0 | $ 0 | $ 224,262,000 |  |
Successor [Member] | Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |
Proceeds from the sale of Junior Surplus Notes of the Segregated Account |  | $ 0 | $ 0 | $ 224,262,000 |  |

X
- Definition Junior Surplus Notes issued by the Segregated Account of Ambac Assurance to Ambac upon Ambac's emergence from bankruptcy. These Junior Surplus notes will be includable in surplus for statutory accounting purposes as prescribed or permitted by state laws and regulations. + References No definition available. + Details
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- Definition The maximum number of capital stock permitted to be issued by Ambac's Amended and Restated Certificate of Incorporation. + References No definition available. + Details
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- Definition Transfer restrictions on any person or group of persons already owning this percentage of common stock. + References No definition available. + Details
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- Definition Transfer restrictions on any person or group of persons accumulating this percentage of common stock. + References No definition available. + Details
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- Definition Ability to vote has been restricted for any person owning at least this percentage of common stock to be this percentage minus one vote. + References No definition available. + Details
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- Definition Voting restrictions on any person owning at least this percentage of common stock. + References No definition available. + Details
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- Definition Reflects the effective annual interest rate on the privately placed Notes issued by the Trust to third party investors. Payments on these Notes will only be made to the extent that the Segregated Account of Ambac Assurance makes payment on the Junior Surplus Notes that serve as collateral for these Notes + References No definition available. + Details
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- Definition In accordance with the provisions of the Cost Allocation Agreement, this element represents allowable reimbursements for reasonable operating expenses through March 2017. + References No definition available. + Details
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- Definition In accordance with the provisions of the Cost Allocation Agreement, this element represents allowable reimbursements for reasonable operating expenses after 2017. + References No definition available. + Details
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- Definition Cash grant released from escrow as part of Mediation Agreement. Balance distributed from Ambac Assurance to Ambac upon emergence from bankruptcy. + References No definition available. + Details
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- Definition Face (par) amount of Owner Trust Certificate at time of issuance. This Owner Trust Certificate was issued by the Trust to Ambac Financial Group, Inc. Trust assets consist of Junior Surplus Notes issued by the Segregated Account of Ambac Assurance. + References No definition available. + Details
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- Definition Face (par) amount of Private Placement instrument at time of issuance. This private placement was issued by the Trust to third party investors. Trust assets consist of Junior Surplus Notes issued by the Segregated Account of Ambac Assurance. + References No definition available. + Details
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- Definition The stated maturity date of the private placement notes issued by the Trust. + References No definition available. + Details
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- Definition The percentage of the proceeds of the private placement of the par plus accrued and unpaid interest on the junior surplus notes. + References No definition available. + Details
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- Definition Proceeds from the sale of Segregated Account Junior Surplus Notes from Ambac Financial Group to a newly formed Trust + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Face amount or stated value per share of common stock. + 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 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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