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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)

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