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Note 1 - Condensed Consolidated Financial Statements - Basis of Presentation and Business Overview Capital and Liquidity (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 01, 2015 | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) segment | Jun. 30, 2014 USD ($) | Jun. 18, 2015 USD ($) | Dec. 31, 2014 USD ($)
Business Overview [Abstract] |  |  |  |  |  |  |  |
Number of Operating Segments | segment |  |  |  |  | 2 |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 202,000 |
Loss on Repurchase of Debt Instrument |  |  | $ 91,876 | $ 0 | $ 91,876 | $ 0 |  |
Mortgage Insurance Segment |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |
Private Mortgage Insurance Protects Lenders For Loans Made With Less Than This Maximum Down Payment Percentage |  |  | 20.00% |  | 20.00% |  |  |
Percentage Of Primary Insurance On Domestic First-Lien Mortgages To Total Risk In Force |  |  | 97.40% |  | 97.40% |  |  |
First Lien Primary Mortgage Insurance Risk In Force |  |  | $ 44,800,000 |  | $ 44,800,000 |  |  |
Percentage Of Pool Insurance On Domestic First-Lien Mortgages To Total Risk In Force |  |  | 2.50% |  | 2.50% |  |  |
Bank of America Settlement Agreement [Member] | Mortgage Insurance Segment |  |  |  |  |  |  |  |
BAC Settlement Agreement [Abstract] |  |  |  |  |  |  |  |
Loss Contingency, Settlement Agreement, Percentage of Subject Loans Not Held by Insureds or Are Non-GSE Investors |  |  | 12.00% |  | 12.00% |  |  |
Sale of Radian Asset Assurance [Member] | Parent Company |  |  |  |  |  |  |  |
Business Overview [Abstract] |  |  |  |  |  |  |  |
Sale of Stock, Percentage of Ownership before Transaction |  | 100.00% |  |  |  |  |  |
Senior Notes Due 2020 [Member] |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |
Long-term debt, Gross |  |  | $ 350,000 |  | $ 350,000 |  |  |
Convertible Senior Notes Due 2017 |  |  |  |  |  |  |  |
Basis of Presentation and Business Overview [Line Items] |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense | [1] |  | 451 |  | 451 |  |  | $ 3,974
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |
Long-term debt, Gross |  |  | 60,914 |  | $ 60,914 |  |  | 450,000
Extinguishment of Debt, Amount |  |  | 389,100 |  |  |  |  |
Loss on Repurchase of Debt Instrument |  |  | $ 91,876 |  |  |  |  |
New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |  |  |  |  |  |
Basis of Presentation and Business Overview [Line Items] |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense |  |  |  |  |  |  |  | 17,627
New Accounting Pronouncement, Early Adoption, Effect [Member] | Convertible Senior Notes Due 2017 |  |  |  |  |  |  |  |
Basis of Presentation and Business Overview [Line Items] |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense |  |  |  |  |  |  |  | $ 3,974
[1] | Included within long-term debt and is being amortized over the life of the convertible notes.

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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