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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statement of Total Comprehensive Income (Parenthetical) (Detail) (Successor Ambac [Member], USD $)
In Thousands, unless otherwise specified
 8 Months Ended
Dec. 31, 2013
Condensed Income Statements, Captions [Line Items]  
Unrealized gains (losses) on securities, net of deferred income taxes $ 0
Gain (loss) gain on foreign currency translation, net of deferred income taxes 0
Ambac Financial Group, Inc Parent Company Only [Member]
  
Condensed Income Statements, Captions [Line Items]  
Unrealized gains (losses) on securities, net of deferred income taxes 0
Gain (loss) gain on foreign currency translation, net of deferred income taxes $ 0