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Schedule II - Reorganization Items Schedule II - Reorganization Items (Detail) - USD ($) $ in Thousands | 3 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Apr. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014
Reorganization Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  | 50.00% |  |  |
Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reorganization Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Professional fees |  |  |  |  |  |  |  |  |  | $ 460 | $ 0 | $ 204
Gain from cancellation and satisfaction of Predecessor Ambac debt |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Fresh start reporting adjustments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total reorganization items | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 2 | $ 186 | $ 23 |  | 493 | 0 | 211
Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reorganization Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Professional fees |  |  |  |  |  |  |  |  | $ 4,483 |  |  |
Gain from cancellation and satisfaction of Predecessor Ambac debt |  |  |  |  |  |  |  |  | (1,521,435) |  |  |
Fresh start reporting adjustments |  |  |  |  |  |  |  |  | (1,228,251) |  |  |
Total reorganization items |  |  |  |  |  |  |  |  | (2,745,180) |  |  |
Ambac Financial Group, Inc Parent Company Only [Member] | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reorganization Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total reorganization items |  |  |  |  |  |  |  |  |  | $ 493 | $ 0 | $ 211
Ambac Financial Group, Inc Parent Company Only [Member] | Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reorganization Items [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total reorganization items |  |  |  |  |  |  |  |  | $ (2,745,180) |  |  |

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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 Amount of net gain (loss) on settlement of other claims for entities in bankruptcy, reported as a reorganization item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=49172455&loc=d3e55730-112764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56145-112766 + Details
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- Definition Amount of reorganization items related to legal and advisory professional fees related to entities in bankruptcy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=49172455&loc=d3e55730-112764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56145-112766 + Details
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