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Note 4 - Fair Value of Financial Instruments Impact of Non-Performance Risk on Fair Value Disclosure (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
basispoint
Dec. 31, 2013
basispoint
Jun. 30, 2013
basispoint
Dec. 31, 2012
basispoint
Five Year CDS Spread Details [Abstract]        
Derivative Liability, Fair Value, Gross Liability $ 314.2 $ 445.1    
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities 169.4 209.9    
Derivative liabilities, net 144.8 235.2    
Fair Value, Concentration of Risk, Market Risk Management, Additional Details [Member]
        
Five Year CDS Spread Details [Abstract]        
Radian Group's five year CDS Spread (in basis points) 287 323 504 913
Number of Years for CDS Spread Related to Non Performance Risk In Fair Value Disclosure 5 years      
Market View Of The Probability That Registrant Will Default In The Next Five Years 20.90% 22.90%    
Number Of Years In Which The Market Believes Radian Group Will Default 5 years      
Change in Impact of Non Performance Risk on Fair Value of Financial Instruments 40.5      
Corporate Collateralized Debt Obligations [Member]
        
Five Year CDS Spread Details [Abstract]        
Derivative Liability, Fair Value, Gross Liability 15.8 30.4    
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities 17.3 29.0    
Derivative liabilities, net (1.5) 1.4    
Non Corporate Collateralized Debt Obligations And Other Derivative Transactions [Member]
        
Five Year CDS Spread Details [Abstract]        
Derivative Liability, Fair Value, Gross Liability 293.0 [1] 409.7 [1]    
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities 149.9 [1] 178.7 [1]    
Derivative liabilities, net 143.1 [1] 231.0 [1]    
NIMS Related [Member]
        
Five Year CDS Spread Details [Abstract]        
Derivative Liability, Fair Value, Gross Liability 5.4 [2] 5.0 [2]    
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities 2.2 [2] 2.2 [2]    
Derivative liabilities, net $ 3.2 [2] $ 2.8 [2]    
[1] Includes the net fair value liability recorded within derivative assets and derivative liabilities and the net fair value liabilities included in our consolidated VIEs.
[2] Includes NIMS VIE debt.