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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statement of Total Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Revenues:    
Total revenues before expenses and reorganization items $ 685,689 $ 295,764
Expenses:    
Loss before reorganization items, income taxes and equity in undistributed net loss of non-debtor subsidiaries (249,290) (1,833,088)
Reorganization items 7,215 49,861
Loss before income taxes and equity in undistributed net loss of non-debtor subsidiaries (256,505) (1,882,949)
Federal income tax expense (benefit) 2,849 77,422
Net loss (259,354) (1,960,371)
Other comprehensive income, after tax:    
Net loss (259,354) (1,960,371)
Unrealized gains on securities, net of deferred income taxes of $0 221,150 120,637
Less: reclassification adjustment for net gain (loss) included in net (loss) 54,898 (48,614)
(Loss) gain on foreign currency translation, net of deferred income taxes of $0 (540) 1,528
Amortization of postretirement benefit, net of tax (3,792) 753
Total other comprehensive income, net of tax 161,920 171,532
Total comprehensive loss attributable to Ambac Financial Group, Inc. (94,552) (1,788,946)
AMBAC FINANCIAL GROUP, INC PARENT COMPANY ONLY [Member]
    
Revenues:    
Interest and other income 979 7,669
Total revenues before expenses and reorganization items 979 7,669
Expenses:    
Operating expenses (151) 5,023
Total expenses (151) 5,023
Loss before reorganization items, income taxes and equity in undistributed net loss of non-debtor subsidiaries 1,130 2,646
Reorganization items 7,215 49,861
Loss before income taxes and equity in undistributed net loss of non-debtor subsidiaries (6,085) (47,215)
Federal income tax expense (benefit) (136) 3,900
Net loss before equity in undistributed net loss of non-debtor subsidiaries (5,949) (51,115)
Equity in undistributed net loss of non-debtor subsidiaries (250,729) (1,909,316)
Net loss (256,678) (1,960,431)
Other comprehensive income, after tax:    
Net loss (256,678) (1,960,431)
Unrealized gains on securities, net of deferred income taxes of $0 221,150 120,637
Less: reclassification adjustment for net gain (loss) included in net (loss) 54,898 (48,614)
(Loss) gain on foreign currency translation, net of deferred income taxes of $0 (334) 1,481
Amortization of postretirement benefit, net of tax (3,792) 753
Total other comprehensive income, net of tax 162,126 171,485
Total comprehensive loss attributable to Ambac Financial Group, Inc. $ (94,552) $ (1,788,946)