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Schedule II - Reorganization Items (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]
Reorganization Items [Line Items]              
U.S. Trustee fees $ 33 $ 23 $ 50   $ 33 $ 23 $ 50
Professional fees 460 4,483 7,165   460 4,483 7,165
Gain from cancellation and satisfaction of Predecessor Ambac debt   (1,521,435)       (1,521,435)  
Fresh start reporting adjustments   (1,228,251)       (1,228,251)  
Total reorganization items $ 493 $ (2,745,180) $ 7,215 $ (2,745,180) $ 493 $ (2,745,180) $ 7,215