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Note 1 - Condensed Consolidated Financial Statements - Basis of Presentation Capital and Liquidity (Details) (USD $)
6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended
Jun. 30, 2013
segment
Jun. 30, 2012
Jun. 30, 2013
Mortgage Insurance Segment
Jun. 30, 2013
Less Than [Member]
Mortgage Insurance Segment
Jun. 30, 2013
Five Point Three Seven Five Percent Senior Notes due 2015 [Member]
Jun. 30, 2013
Nine Percent Notes Due 2017 [Member]
Jun. 30, 2013
Two Point Two Five Percent Convertible Notes Due 2019 [Member]
Jun. 30, 2013
Debt Due 2015 Exchange [Member]
Five Point Three Seven Five Percent Senior Notes due 2015 [Member]
Jun. 30, 2013
Debt Due 2015 Exchange [Member]
Nine Percent Notes Due 2017 [Member]
Jun. 30, 2013
Radian Guaranty [Member]
Jul. 31, 2014
Radian Asset Assurance [Member]
Scenario, Forecast [Member]
Jan. 31, 2013
Radian Asset Assurance [Member]
2012 FGIC Commutation [Member]
Feb. 28, 2013
Radian Asset Assurance [Member]
Strategic Capital and Liquidity Initiatives [Member]
Jun. 30, 2013
Radian Asset Assurance [Member]
CDO Termination [Member]
counterparty
contract
Jun. 30, 2013
Parent Company
Jun. 30, 2013
Parent Company
Corporate Expenses and Interest Payments Due in Current Year [Member]
Mar. 31, 2013
Common Stock
Mar. 31, 2013
Common Stock
Stock Offering 2013 [Member]
Jan. 31, 2013
Reinsurance [Member]
Radian Asset Assurance [Member]
2012 FGIC Commutation [Member]
Jun. 30, 2013
Primary Mortgage Product [Member]
Mortgage Insurance Segment
Dec. 31, 2012
Primary Mortgage Product [Member]
Mortgage Insurance Segment
Jun. 30, 2013
Minimum [Member]
Jun. 30, 2013
Maximum [Member]
Mar. 31, 2013
Convertible Debt [Member]
Two Point Two Five Percent Convertible Notes Due 2019 [Member]
Jun. 30, 2013
Convertible Debt [Member]
Two Point Two Five Percent Convertible Notes Due 2019 [Member]
Jun. 30, 2013
Convertible Debt [Member]
Debt Offering 2013 [Member]
Two Point Two Five Percent Convertible Notes Due 2019 [Member]
Mar. 31, 2013
Convertible Debt [Member]
Debt Offering 2013 [Member]
Two Point Two Five Percent Convertible Notes Due 2019 [Member]
Jul. 31, 2013
Subsequent Event [Member]
Radian Asset Assurance [Member]
Risk to Capital Line Items [Line Items]                                                        
Equity Method Investment, Ownership Percentage                                           20.00% 50.00%          
Business Overview [Abstract]                                                        
Number of Operating Segments 2                                                      
Mortgage Insurance [Abstract]                                                        
Private Mortage Insurance Protects Lenders For Loans Made With This Maximum Downpayment Percentage     20.00%                                                  
Percentage Of Primary Insurance On Domestic First-Lien Mortgages To Total First Lien Insurance Risk In Force     95.20%                                                  
Total Risk In Force     $ 39,100,000,000                                                  
Percentage Of Pool Insurance On Domestic First-Lien Mortgages To Total First Lien Insurance Risk In Force     4.40%                                                  
NonTraditional Risk In Force     125,000,000                                                  
Percentage Of Non-Traditional RIF To Total RIF       1.00%                                                
Business Conditions [Abstract]                                                        
Percentage Decrease In New Defaults                                       19.00% 22.00%              
Concentration Risk, Percentage       50.00%                                                
Maximum Loan To Value Percentage For G.S.E. Acquired Loans 80.00%                                                      
Minimum Percentage Of The Loans In Excess Of An 80% L.T.V. Which Must Be Retained By The Mortgage Originator Or Seller 10.00%                                                      
Capital Preservation and Liquidity Management Initiatives [Abstract]                                                        
Reduction In Net Par Outstanding                           3,400,000,000         822,200,000                  
Payment of Dividend by Subsidiary to Parent                     40,000,000                                 36,000,000
Contingency Reserve Release                       6,700,000 61,100,000                              
Number Of Our Credit Derivative Counterparties That Excercised Their Termination Rights                           4                            
Number of Corporate CDOs Terminated                           9                            
Debt Instrument, Interest Rate, Stated Percentage         5.375% 9.00% 2.25% 5.375% 9.00%                                 2.25%    
Debt Instrument, Face Amount           195,500,000     195,500,000                             400,000,000 400,000,000   400,000,000  
Proceeds from Issuance of Long-term Debt                                               389,800,000        
Stock Issued During Period, Shares, New Issues                                 39,100,000 39,100,000.0                    
Sale of Stock, Price Per Share                                 $ 8.00 $ 8.00                    
Proceeds from Issuance of Common Stock 299,542,000 0                             299,500,000 299,500,000                    
Unrestricted Cash and Liquid Investments                             918,600,000                          
Extinguishment of Debt, Amount               195,500,000                                        
Risk to Capital, Entity's Intended Maximum                   0.20                                    
Proceeds from Contributions from Affiliates                             102,600,000 14,300,000                        
Unrestricted Cash and Liquid Investments Net of Subsidiaries Prepaid Corporate Expenses                             $ 816,000,000