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Note 1 - Condensed Consolidated Financial Statements - Business Overview and Significant Accounting Policies Business Overview and Significant Accounting Policies(Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) segment | Sep. 30, 2015 USD ($) | Aug. 12, 2016 USD ($) | Jun. 29, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Basis of Presentation and Business Overview [Line Items] |  |  |  |  |  |  |  |  |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  |  | $ (87,055,000) | $ 19,451,000 |  |  |  |
Proceeds from Sale and Maturity of Fixed-Maturity Investments Available-for-sale |  |  |  |  | 537,679,000 | 16,208,000 |  |  |  |
Payments to Acquire Available-for-sale Securities |  |  |  |  | 1,419,431,000 | 1,006,985,000 |  |  |  |
Net cash provided by (used in) operating activities, continuing operations |  |  |  |  | 290,137,000 | (5,993,000) |  |  |  |
Net cash provided by (used in) operating activities, discontinued operations |  |  |  |  | 0 | (1,759,000) |  |  |  |
Net cash provided by (used in) investing activities, discontinued operations |  |  |  |  | 0 | 4,999,000 |  |  |  |
Net Cash Provided by (Used in) Discontinued Operations |  |  |  |  | $ 0 | (421,000) |  |  |  |
Business Overview [Abstract] |  |  |  |  |  |  |  |  |  |
Number of Operating Segments | segment |  |  |  |  | 2 |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  |  |  |  | $ 100,188,000 | 202,000,000 |  |  |  |
Loss on induced conversion and debt extinguishment (Note 11) |  | $ 17,397,000 |  | $ 11,000 | $ 75,075,000 | 91,887,000 |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | $ 125,000,000 |  |
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% |  | 20.00% |  |  |  |  |
Percentage Of Primary Insurance On Domestic First-Lien Mortgages To Total Risk In Force |  | 97.80% | 97.80% |  | 97.80% |  |  |  |  |
Risk In Force |  | $ 47,300,000,000 | $ 47,300,000,000 |  | $ 47,300,000,000 |  |  |  |  |
Senior Notes Due 2017 |  |  |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  | $ 195,500,000 |  |  |
Loss on induced conversion and debt extinguishment (Note 11) |  |  | $ 15,000,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 9.00% | 9.00% |  | 9.00% |  |  |  |  |
Senior Notes Due 2021 |  |  |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Long-term debt, Gross |  | $ 350,000,000 | $ 350,000,000 |  | $ 350,000,000 |  |  |  | $ 350,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.00% | 7.00% |  | 7.00% |  |  |  |  |
Convertible Senior Notes Due 2017 |  |  |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.00% | 3.00% |  | 3.00% |  |  |  |  |
Convertible Senior Notes Due 2019 |  |  |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.25% | 2.25% |  | 2.25% |  |  |  |  |
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |
Basis of Presentation and Business Overview [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Sale and Maturity of Fixed-Maturity Investments Available-for-sale |  |  |  |  |  | 96,684,000 |  |  |  |
Payments to Acquire Available-for-sale Securities |  |  |  |  |  | 1,087,461,000 |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Loss on induced conversion and debt extinguishment (Note 11) |  |  |  |  | $ 60,100,000 |  |  |  |  |
Repayments of Convertible Debt |  |  |  |  | 235,000,000 |  |  |  |  |
Convertible Debt | Convertible Senior Notes Due 2017 |  |  |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Long-term debt, Gross |  | $ 22,233,000 | $ 22,233,000 |  | 22,233,000 |  |  |  |  | $ 52,370,000
Debt Instrument, Repurchase Amount |  | 30,100,000 | 30,100,000 |  | 30,100,000 |  |  |  |  |
Convertible Debt | Convertible Senior Notes Due 2019 |  |  |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Long-term debt, Gross |  | 68,024,000 | 68,024,000 |  | 68,024,000 |  |  |  |  | $ 389,992,000
Debt Instrument, Repurchase Amount |  | $ 322,000,000 | $ 322,000,000 |  | $ 322,000,000 |  |  |  |  |
Reportable Legal Entities [Member] | Radian Guaranty |  |  |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Repayments of Notes Payable | $ 325,000,000 |  |  |  |  |  |  |  |  |
Pool Insurance Mortgage Insurance Product [Member] | Mortgage Insurance Segment |  |  |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 2.10% |  |  |  |  |
Classification Error [Member] |  |  |  |  |  |  |  |  |  |
Basis of Presentation and Business Overview [Line Items] |  |  |  |  |  |  |  |  |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  | $ 0 |  |  |  |

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