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Note 13 - Statutory Information Statutory Information (Details) (USD $)
9 Months Ended12 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Radian Guaranty [Member]
Dec. 31, 2010
Radian Guaranty [Member]
Jun. 30, 2011
Radian Guaranty [Member]
Dec. 31, 2006
Radian Guaranty [Member]
Sep. 30, 2011
Radian Asset Assurance
Sep. 30, 2011
CMAC Of Texas
Dec. 31, 2008
CMAC Of Texas
Sep. 30, 2011
Government [Member]
Statutory Accounting Practices         
Maximum Regulatory Risk To Capital Ratio25.00%       25.00%
Statutory net loss $ (370,200,000)$ (535,200,000)   $ (52,400,000)  
Statutory policyholders' surplus 937,100,0001,295,700,000  1,000,000,00020,300,000  
Statutory contingency reserve 019,600,000      
Risk To Capital Ratio 21.40%16.80% 8.10%    
Additional Risk And Capital Information         
Insurance Risk Ceded To Affiliates   2,000,000,000     
Capital Contributions Receivable 30,000,000    23,000,000  
Claims Paying Resources     2,100,000,000   
Required statutory surplus      20,000,000  
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries     53,400,000   
Subsequent Event Information [Abstract]         
Net par outstanding on CDO of ABS transaction     450,600,000   
Subsequent Event, Statutory Amount, Lower Range88,000,00088,000,000       
Subsequent Event, Statutory Amount, Higher Range109,000,000109,000,000       
CMAC Of Texas Tax Examination Information [Abstract]         
Proposed Increase To Tax Liability Resulting From I.R.S. Examination Of Tax Years 2000 Through 2007      128,000,000  
Qualified Deposit With The U.S. Department Of Treasury Relating to Tax Years 2000 Through 2004      85,000,000  
Qualified Deposit With The U.S. Department Of Treasury Relating To Tax Years 2005 Through 2007      4,000,000  
Initial Proposed Increase To Tax Liability Resulting From T.X.D.O.I. Examination Of Tax Years 2004 Through 2008       128,000,000 
Proposed Increase To Tax Liability Resulting From T.X.D.O.I. Examination Of Tax Years 2004 Through 2008      $ 27,500,000  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate      35.00%