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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Assets:        
Fixed income securities, at fair value $ 5,402,290 $ 5,402,395    
Fixed income securities pledged as collateral, at fair value (amortized cost of $228,066 in 2013 and $265,517 in 2012) 228,228 265,779    
Short-term investments, at fair value (amortized cost of $767,919 in 2013 and $661,219 in 2012) 767,932 661,658    
Other investments, at fair value 113,812 100    
Total investments 6,512,262 6,329,932    
Cash 53,135 43,837    
Receivable for securities 40,822 761    
Investment income due and accrued 33,944 39,742    
Premium receivables 1,543,098 1,620,621    
Reinsurance recoverable on paid and unpaid losses 160,682 159,086    
Deferred ceded premium 170,032 177,893    
Subrogation recoverable 545,007 497,346    
Deferred acquisition costs 192,306 199,160    
Loans 8,691 9,203    
Derivative assets 112,811 126,106    
Other assets 40,365 39,715    
Total assets 26,164,660 27,085,265    
Liabilities:        
Liabilities subject to compromise 1,704,641 1,704,904    
Unearned premiums 2,623,445 2,778,401    
Losses and loss expense reserve 6,590,216 6,619,486    
Ceded premiums payable 92,085 94,527    
Obligations under investment agreements 357,371 356,091    
Obligations under investment repurchase agreements 5,926 5,926    
Deferred taxes 1,540 1,586    
Current taxes 97,274 96,778    
Long-term debt 153,873 150,170    
Accrued interest payable 246,378 228,835    
Derivative liabilities 505,746 531,315    
Other liabilities 91,057 102,488    
Payable for securities purchased 17,051 25    
Total liabilities 29,034,730 30,332,232    
Stockholders' deficit:        
Preferred stock          
Common stock 3,080 3,080    
Additional paid-in capital 2,172,027 2,172,027    
Accumulated other comprehensive income 720,071 625,385    
Accumulated deficit (6,015,025) (6,297,264)    
Common stock held in treasury at cost (410,695) (410,755)    
Total Ambac Financial Group, Inc. stockholders' deficit (3,530,542) (3,907,527)    
Noncontrolling interest 660,472 660,560    
Total stockholders' deficit (2,870,070) (3,246,967) (2,913,642) (3,149,533)
Total liabilities and stockholders' deficit 26,164,660 27,085,265    
Variable interest entity [Member]
        
Assets:        
Fixed income securities, at fair value 2,414,607 2,261,294    
Restricted cash 2,258 2,290    
Investment income due and accrued 1,338 4,101    
Loans 14,327,840 15,568,711    
Other assets 5,462 5,467    
Liabilities:        
Long-term debt 14,229,373 15,436,008    
Accrued interest payable 828 3,618    
Derivative liabilities 2,317,625 2,221,781    
Other liabilities $ 301 $ 293