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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
 8 Months Ended 4 Months Ended 12 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]
Apr. 30, 2013
Ambac Financial Group, Inc Parent Company Only [Member]
Successor 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]
Revenues:              
Interest income       $ 39 $ 22,227   $ 221
Other income 4,364 8,363 106,098   197,122   758
Net realized gains 4,467 53,305 72,101   2    
Total revenues before expenses and reorganization items 581,048 640,388 685,689 39 219,351   979
Expenses:              
Operating expenses       539 3,018   (151)
Total expenses       539 3,018   (151)
Income (loss) before income taxes, reorganization costs and equity in undistributed net loss of subsidiaries 512,809 602,853 (249,290) (500) 216,333   1,130
Reorganization items 493 (2,745,180) 7,215 (2,745,180) 493 (2,745,180) 7,215
Income (loss) before income taxes and equity in undistributed net loss of subsidiaries 512,316 3,348,033 (256,505) 2,744,680 215,840   (6,085)
Federal income tax benefit 7,514 755 2,849 (703)     (136)
Income (loss) before equity in undistributed net income (loss) of subsidiaries       2,745,383 215,840   (5,949)
Equity in undistributed net income (loss) of subsidiaries       603,666 289,379 603,666 (250,729)
Net income (loss) 504,802 3,347,278 (259,354) 3,349,049 505,219 3,349,049 (256,678)
Other comprehensive income, after tax:              
Net income (loss) 504,802 3,347,278 (259,354) 3,349,049 505,219 3,349,049 (256,678)
Unrealized gains (losses) on securities, net of deferred income taxes of $0 (41,910) 175,347 166,252 175,347 (41,910)   166,252
Gain (loss) gain on foreign currency translation, net of deferred income taxes of $0. 43,165 (428) (540) (657) 42,724   (334)
Changes to postretirement benefit, net of tax 10,847 185 (3,792) 185 10,847   (3,792)
Total other comprehensive income 12,102 175,104 161,920 174,875 11,661   162,126
Total comprehensive income (loss) attributable to Ambac Financial Group, Inc. $ 516,880 $ 3,523,924 $ (94,552) $ 3,523,924 $ 516,880   $ (94,552)