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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statements of Stockholders' Equity (Detail) (USD $) In Thousands, unless otherwise specified | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended |  | 4 Months Ended | 8 Months Ended | 4 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended |  |  |  |  |  | 4 Months Ended |  | 8 Months Ended | 4 Months Ended |  | 8 Months Ended | 4 Months Ended | 12 Months Ended
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Dec. 31, 2013 Successor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Dec. 31, 2012 Predecessor Ambac [Member] | Dec. 31, 2013 Retained Earnings/Accumulated Deficit [Member] Successor Ambac [Member] | Apr. 30, 2013 Retained Earnings/Accumulated Deficit [Member] Predecessor Ambac [Member] | Dec. 31, 2012 Retained Earnings/Accumulated Deficit [Member] Predecessor Ambac [Member] | Dec. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Successor Ambac [Member] | Apr. 30, 2013 Accumulated Other Comprehensive Income (Loss) [Member] Predecessor Ambac [Member] | Dec. 31, 2012 Accumulated Other Comprehensive Income (Loss) [Member] Predecessor Ambac [Member] | Dec. 31, 2013 Preferred Stock [Member] Successor Ambac [Member] | Dec. 31, 2013 Common Stock [Member] Successor Ambac [Member] | Apr. 30, 2013 Common Stock [Member] Predecessor Ambac [Member] | Dec. 31, 2013 Paid-in Capital [Member] Successor Ambac [Member] | Apr. 30, 2013 Paid-in Capital [Member] Predecessor Ambac [Member] | Dec. 31, 2013 Common Stock Held in Treasury, at Cost [Member] Successor Ambac [Member] | Apr. 30, 2013 Common Stock Held in Treasury, at Cost [Member] Predecessor Ambac [Member] | Dec. 31, 2012 Common Stock Held in Treasury, at Cost [Member] Predecessor Ambac [Member] | Dec. 31, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Successor Ambac [Member] | Apr. 30, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Predecessor Ambac [Member] | Dec. 31, 2012 Ambac Financial Group, Inc Parent Company Only [Member] Predecessor Ambac [Member] | Dec. 31, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Retained Earnings/Accumulated Deficit [Member] Successor Ambac [Member] | Apr. 30, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Retained Earnings/Accumulated Deficit [Member] Predecessor Ambac [Member] | Dec. 31, 2012 Ambac Financial Group, Inc Parent Company Only [Member] Retained Earnings/Accumulated Deficit [Member] Predecessor Ambac [Member] | Dec. 31, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Accumulated Other Comprehensive Income (Loss) [Member] Successor Ambac [Member] | Apr. 30, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Accumulated Other Comprehensive Income (Loss) [Member] Predecessor Ambac [Member] | Dec. 31, 2012 Ambac Financial Group, Inc Parent Company Only [Member] Accumulated Other Comprehensive Income (Loss) [Member] Predecessor Ambac [Member] | Apr. 30, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Preferred Stock [Member] Predecessor Ambac [Member] | Dec. 31, 2012 Ambac Financial Group, Inc Parent Company Only [Member] Preferred Stock [Member] Predecessor Ambac [Member] | Dec. 31, 2011 Ambac Financial Group, Inc Parent Company Only [Member] Preferred Stock [Member] Predecessor Ambac [Member] | Dec. 31, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Common Stock [Member] Successor Ambac [Member] | Apr. 30, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Common Stock [Member] Successor Ambac [Member] | Apr. 30, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Common Stock [Member] Predecessor Ambac [Member] | Dec. 31, 2011 Ambac Financial Group, Inc Parent Company Only [Member] Common Stock [Member] Predecessor Ambac [Member] | Dec. 31, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Paid-in Capital [Member] Successor Ambac [Member] | Apr. 30, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Paid-in Capital [Member] Predecessor Ambac [Member] | Dec. 31, 2011 Ambac Financial Group, Inc Parent Company Only [Member] Paid-in Capital [Member] Predecessor Ambac [Member] | Dec. 31, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Common Stock Held in Treasury, at Cost [Member] Successor Ambac [Member] | Apr. 30, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Common Stock Held in Treasury, at Cost [Member] Predecessor Ambac [Member] | Dec. 31, 2012 Ambac Financial Group, Inc Parent Company Only [Member] Common Stock Held in Treasury, at Cost [Member] Predecessor Ambac [Member]
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of new equity in connection with emergence from Chapter 11 | $ 185,000 |  |  |  |  |  |  |  |  |  | $ 450 |  | $ 184,550 |  |  |  |  | $ 185,000 |  |  |  |  |  |  |  |  |  |  |  | $ 450 |  |  |  | $ 184,550 |  |  |  |  |
Beginning balance | 185,000 | (3,907,527) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 185,000 | (3,907,527) | (3,812,975) |  | (6,297,264) | (6,039,922) |  | 625,385 | 463,259 |  |  |  | 450 | 450 | 3,080 | 3,080 | 184,550 | 2,172,027 | 2,172,027 |  | (410,755) | (411,419)
Total comprehensive income (loss) | 516,904 | 3,522,382 | (97,434) | 505,219 | 3,349,049 | (256,678) | 11,661 | 174,875 | 162,126 |  |  |  |  |  |  |  |  | 516,880 | 3,523,924 | (94,552) | 505,219 | 3,349,049 | (256,678) | 11,661 | 174,875 | 162,126 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercised | 16 |  |  |  |  |  |  |  |  |  |  |  | 16 |  |  |  |  | 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16 |  |  |  |  |
Cost of shares acquired | (19) |  |  |  |  |  |  |  |  |  |  |  |  |  | (19) |  |  | (19) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (19) |  |
Stock-based compensation | 1,106 | (60) | (664) |  | (60) | (664) |  |  |  |  |  |  | 1,106 |  |  |  |  | 1,106 | (60) | (664) |  | (60) | (664) |  |  |  |  |  |  |  |  |  |  | 1,106 |  |  |  |  |
Shares issued under equity plans |  | 60 | 664 |  |  |  |  |  |  |  |  |  |  |  |  | 60 | 664 |  | 60 | 664 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 | 664
Elimination of Predecessor Ambac Shareholder equity accounts |  |  |  |  | 2,948,275 |  |  | (800,260) |  |  |  | (3,080) |  | (2,172,027) |  | 410,695 |  |  | 383,603 |  |  | 2,948,275 |  |  | (800,260) |  |  |  |  |  |  | (3,080) |  |  | (2,172,027) |  |  | 410,695 |
Ending balance | $ 702,983 | $ (3,133,289) | $ (3,907,527) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 702,983 |  | $ (3,907,527) | $ 505,219 |  | $ (6,297,264) | $ 11,661 |  | $ 625,385 |  |  |  | $ 450 | $ 450 |  | $ 3,080 | $ 185,672 |  | $ 2,172,027 | $ (19) |  | $ (410,755)

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