Consolidated Statements Of Operations (Debtor-In-Possession) (USD $) In Thousands, except Share data	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Other-than-temporary impairment losses:
Total revenues	$ 25,717	$ 361,156	$ 377,195	$ 243,187
Expenses:
Total expenses before reorganization items	17,696	285,072	1,256,671	914,754
Pre-tax gain (loss) from continuing operations before reorganization items	8,021	76,084	(879,476)	(671,567)
Reorganization items, net	8,519		39,794
Pre-tax (loss) gain from continuing operations	(498)	76,084	(919,270)	(671,567)
Provision for income taxes	75,011	65	77,903	50
Net (loss) income	(75,509)	76,019	(997,173)	(671,617)
Less: net (loss) income attributable to the noncontrolling interest	(2)	13	45	(13)
Net (loss) income attributable to Ambac Financial Group, Inc.	(75,507)	76,006	(997,218)	(671,604)
Net (loss) income per share attributable to Ambac Financial Group, Inc. common shareholders	$ (0.25)	$ 0.25	$ (3.30)	$ (2.29)
Net (loss) income per diluted share attributable to Ambac Financial Group, Inc. common shareholders	$ (0.25)	$ 0.25	$ (3.30)	$ (2.29)
Weighted-average number of common shares outstanding:
Basic	302,467,255	302,177,506	302,429,879	293,542,268
Diluted	302,467,255	302,177,506	302,429,879	293,542,268
Financial Guarantee [Member]
Revenues:
Net premiums earned	102,055	143,085	293,125	435,321
Net investment income	81,588	69,840	241,217	256,438
Other-than-temporary impairment losses:
Total other-than-temporary impairment losses	(17,729)	(8,461)	(37,235)	(49,706)
Portion of loss recognized in other comprehensive income	7,659	1,877	7,874	4,286
Net other-than-temporary impairment losses recognized in earnings	(10,070)	(6,584)	(29,361)	(45,420)
Net realized investment gains	4,722	2,053	2,272	75,473
Change in fair value of credit derivatives:
Realized gains (losses) and other settlements	3,829	4,862	13,376	(2,762,509)
Unrealized gains	676	4,550	6,513	2,806,963
Net change in fair value of credit derivatives	4,505	9,412	19,889	44,454
Other (loss) income	(4,963)	186,859	32,567	100,713
Income (loss) on variable interest entities	55,008	26,377	51,236	(504,873)
Expenses:
Losses and loss expenses	(60,238)	165,396	1,055,807	577,874
Underwriting and operating expenses	40,340	41,200	94,552	150,627
Interest expense	31,131	27,492	88,846	34,378
Financial Services [Member]
Change in fair value of credit derivatives:
Investment income	9,039	8,425	21,365	26,554
Derivative products	(215,774)	(78,368)	(260,362)	(207,552)
Other-than-temporary impairment losses:
Total other-than-temporary impairment losses	(1,942)		(1,942)	(3,079)
Portion of loss recognized in other comprehensive income	1,125		1,125
Net other-than-temporary impairment losses recognized in earnings	(817)		(817)	(3,079)
Net realized investment gains	362	464	5,853	67,706
Net mark-to-market losses on non-trading derivative contracts				(14,295)
Expenses:
Interest from investment and payment agreements	1,943	3,951	6,158	13,742
Other expenses	2,719	3,460	8,040	10,211
Corporate And Other [Member]
Change in fair value of credit derivatives:
Other (loss) income	62	114	211	1,575
Other-than-temporary impairment losses:
Net realized (losses) gains		(521)		10,172
Expenses:
Other expenses	1,801	13,695	3,268	38,288
Interest expense		$ 29,878		$ 89,634

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