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Financial Guarantee Insurance Contracts - Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Successor Ambac [Member]
Apr. 30, 2013
Successor Ambac [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Losses and loss expense reserve $ 6,042,649 $ 6,106,345 $ 6,106,345 $ 6,619,486
Losses and loss expense reserves included in subrogation recoverable 2,313,452     2,611,430
Subrogation recoverable (501,087)     (497,346)
Subrogation recoveries included in subrogation recoverable 865,714     782,575
Liability for Claims $ 5,541,562     $ 6,122,140