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Note 1 - Condensed Consolidated Financial Statements - Basis of Presentation and Business Overview Capital and Liquidity (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 9 Months Ended | 1 Months Ended |  | 1 Months Ended | 76 Months Ended |  |  | 1 Months Ended | 9 Months Ended |  | 9 Months Ended |
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Sep. 30, 2014 segment | Sep. 30, 2013 | Sep. 30, 2014 Senior Notes Due 2019 [Member] | Jun. 30, 2014 Senior Notes Due 2015 | Sep. 30, 2014 Mortgage Insurance Segment | Jul. 31, 2014 Radian Asset Assurance [Member] | Sep. 30, 2014 Radian Asset Assurance [Member] | Dec. 31, 2013 Radian Asset Assurance [Member] | Sep. 30, 2014 Parent Company | Sep. 30, 2014 Minimum [Member] | Sep. 30, 2014 Maximum [Member] | Sep. 30, 2014 Less Than [Member] Mortgage Insurance Segment | May 31, 2014 Common Stock | Sep. 30, 2014 Common Stock | Sep. 30, 2014 State Insurance Regulations [Member] Mortgage Insurance Segment state | Sep. 30, 2014 Non RBC States [Member] Minimum [Member] | Sep. 30, 2014 Non RBC States [Member] Maximum [Member] | Sep. 30, 2014 Primary Mortgage Product [Member] Mortgage Insurance Segment | Sep. 30, 2014 Bank of America Settlement Agreement [Member] Mortgage Insurance Segment servicers
Basis of Presentation and Business Overview [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  | 20.00% | 50.00% |  |  |  |  |  |  |  |
Business Overview [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating Segments | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Mortgage Insurance Protects Lenders For Loans Made With This Maximum Downpayment Percentage |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Primary Insurance On Domestic First-Lien Mortgages To Total Risk In Force |  |  |  |  | 96.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Lien Primary Mortgage Insurance Risk In Force |  |  |  |  | $ 44,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Pool Insurance On Domestic First-Lien Mortgages To Total Risk In Force |  |  |  |  | 3.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |
NonTraditional Risk In Force |  |  |  |  | 79,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Non-Traditional RIF To Total RIF |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
BAC Settlement Agreement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Servicers With Which the Entity is in Settlement Discussions With |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Loss Contingency, Settlement Agreement, Percentage of Subject Loans Not Held by Insureds or Are Non-GSE Investors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.00%
Business Conditions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Legacy Portfolio Risk in Force to Total Risk in Force |  |  |  |  | 33.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Portfolio Risk in Force Originated Since 2009 to Total Risk in Force |  |  |  |  | 67.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Decrease In New Defaults |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Days Until Eligibility Requirements Become Effective After Final Publication | 180 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transition Period for Compliance to New Eligibility Requirements | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of States That Have A Statutory Or Regulatory Risk Based Capital Requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16 |  |  |  |
Risk To Capital Ratio, Regulatory Maximum | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Required for Capital Adequacy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 5,000,000 |  |
Capital and Liquidity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Reduction Of Net Par Outstanding |  |  |  |  |  |  | 83.00% |  |  |  |  |  |  |  |  |  |  |  |
Net Par Outstanding |  |  |  |  |  |  | 19,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Statutory Accounting Practices, Dividends Paid with Approval of Regulatory Agency |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory capital |  |  |  |  |  |  | 1,033,100,000 | 1,198,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  | 293,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Issued |  |  |  |  |  |  |  |  |  |  |  |  | 17,825 |  |  |  |  |  |
Shares Issued, Price Per Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 14.50 |  |  |  |  |  |
Issuance of common stock | 247,188,000 | 299,410,000 |  |  |  |  |  |  |  |  |  |  |  | 247,200,000 |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  | 54,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt | 57,223,000 | 79,372,000 |  | 57,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  |  | (2,800,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrestricted Cash And Liquid Investments Including Activity After The Balance Sheet Date |  |  |  |  |  |  |  |  | $ 762,000,000 |  |  |  |  |  |  |  |  |  |

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- Definition This concept represents the minimum amount of loans (expressed as a percentage) that a mortgage seller must retain participation in for loans that exceed the 80% loan to value ratio (the ratio of the loan value to the original price of the home). + References No definition available. + Details
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- Definition This concept represents the amount of primary insurance risk in force originated from 2009 through the current reporting date (which specifically excludes the legacy portfolio) as a percentage of total risk in force. + References No definition available. + Details
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- Definition This element represents the maximum down payment percentage on a home's purchase price that is used to measure the need for private mortgage insurance. + References No definition available. + Details
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- Definition This concept represents the transition period given to organizations that are required to comply with new eligibility requirements published by the Government Sponsored Entities (GSE's (Fannie Mae and Freddie Mac)). + References No definition available. + Details
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