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Background and Business Description Rehabilitation Exit Support Agreement (Details) | 3 Months Ended | 4 Months Ended | 12 Months Ended |  |  |
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Mar. 31, 2018 | Mar. 31, 2017 Segment | Apr. 30, 2013 $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2014 | Feb. 12, 2018 USD ($) | Dec. 31, 2016 $ / shares shares | May 01, 2013 $ / shares shares
Entity Incorporation, Date of Incorporation |  |  |  | Apr. 29, 1991 |  |  |  |
Gain Contingency, Unrecorded Amount |  |  |  | $ 1,400,000,000 |  |  |  |
AAC Note Secured by RMBS Securities Value Not Less Than |  |  |  | $ 350,000,000 |  |  |  |
Amount of Senior Surplus Notes Outstanding on June 8, 2020 |  |  |  | 25.00% |  |  |  |
Capital Stock Authorized | shares |  |  | 150,000,000 |  |  |  |  |
Common stock, shares authorized | shares |  |  | 130,000,000 |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  | $ 0.01 |  |  |  |  |
Preferred stock, shares authorized | shares |  |  | 20,000,000 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ / shares |  |  | $ 0.01 |  |  |  |  |
Common stock, shares issued | shares |  |  | 45,000,000 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  | $ 16.67 |  |  |  |  |
Investment Warrants Expiration Date |  |  | Apr. 30, 2023 |  |  |  |  |
Common Stock Voting Restrictions |  |  |  |  | 10.00% |  |  |
Common Stock Voting Restriction Less One Vote |  |  |  |  | 10.00% |  |  |
Common Stock Transfer Restrictions |  |  |  |  | 5.00% |  |  |
Common Stock Additional Transfer Restrictions |  |  |  |  | 5.00% |  |  |
Successor [Member] |  |  |  |  |  |  |  |
Common stock, shares authorized | shares |  |  |  | 130,000,000 |  |  | 130,000,000 |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  | $ 0.01 |  |  | $ 0.01 | $ 0.01
Preferred stock, shares authorized | shares |  |  |  | 20,000,000 |  |  | 20,000,000 |
Preferred Stock, Par or Stated Value Per Share | $ / shares |  |  |  | $ 0.01 |  |  | $ 0.01 |
Common stock, shares issued | shares |  |  |  |  |  |  |  | 45,000,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  | 5,047,138 |  |  |  |  | 5,047,138
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  | $ 16.67
Number of reportable segments | Segment |  | 2 |  |  |  |  |  |
Ambac Assurance [Member] |  |  |  |  |  |  |  |
Net par exposure for policies allocated to the Segregated Account |  |  |  | $ 9,246,357,000 |  |  |  |
AFG [Member] |  |  |  |  |  |  |  |
Amount of Remaining Senior Suplus Notes |  |  |  | $ 60,000,000 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Supporting Holders Participation Rate | 99.60% |  |  |  |  |  |  |
One Time Interest Payment on Surplus Notes |  |  |  |  |  | $ 13,501,000 |  |
Subsequent Event [Member] | Deferred Payment Obligation [Member] |  |  |  |  |  |  |  |
One Dollar Outstanding |  |  |  |  |  | 1.00 |  |
Discount Amount |  |  |  |  |  | 0.065 |  |
Cash Payment Amount |  |  |  |  |  | 0.40 |  |
Payment Amount in New Secured Notes |  |  |  |  |  | 0.41 |  |
Payment Amount in Existing Surplus Notes |  |  |  |  |  | 0.125 |  |
Subsequent Event [Member] | Surplus Notes [Member] |  |  |  |  |  |  |  |
One Dollar Outstanding |  |  |  |  |  | 1.00 |  |
Discount Amount |  |  |  |  |  | 0.065 |  |
Cash Payment Amount |  |  |  |  |  | 0.40 |  |
Payment Amount in New Secured Notes |  |  |  |  |  | 0.41 |  |
Payment Amount in Existing Surplus Notes |  |  |  |  |  | 0.125 |  |
Subsequent Event [Member] | Ambac [Member] | Deferred Payment Obligation [Member] |  |  |  |  |  |  |  |
One Dollar Outstanding |  |  |  |  |  | 1.00 |  |
Discount Amount |  |  |  |  |  | 0.09 |  |
Payment Amount in New Secured Notes |  |  |  |  |  | $ 0.91 |  |

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