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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
	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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All amounts related to share-based compensation plans. Includes the value of stock issued during the period as a result of any share-based compensation plans and the amount of share-based compensation recognized in the statement of operations.

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