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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statements of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:    
Net loss $ (259,354) $ (1,960,371)
Adjustments to reconcile net loss to net cash used in operating activities:    
Reorganization items 7,215 49,861
Other, net 105,906 28,873
Net cash (used in) provided by operating activities (613,898) 3,557
Cash flows from investing activities:    
Change in short-term investments 121,413 208,496
Net cash provided by investing activities 1,037,980 228,026
Net cash flow 27,838 6,502
Cash at January 1 15,999 9,497
Cash at December 31 43,837 15,999
AMBAC FINANCIAL GROUP, INC PARENT COMPANY ONLY [Member]
    
Cash flows from operating activities:    
Net loss (256,678) (1,960,431)
Adjustments to reconcile net loss to net cash used in operating activities:    
Equity in undistributed net loss of non-debtor subsidiaries 250,729 1,909,316
Reorganization items 7,215 49,861
Increase in current income taxes payable/receivable   1,900
Decrease in other assets 30 4,041
Other, net (6,333) (32,783)
Net cash (used in) provided by operating activities (5,037) (28,096)
Cash flows from investing activities:    
Change in short-term investments 4,583 28,518
Net cash provided by investing activities 4,583 28,518
Net cash flow (454) 422
Cash at January 1 496 74
Cash at December 31 $ 42 $ 496