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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 | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2014 basispoint | Dec. 31, 2013 basispoint | Sep. 30, 2013 basispoint | Dec. 31, 2012 basispoint
Five Year CDS Spread Details [Abstract] |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 298.5 |  | $ 445.1 |  |  |
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities | 162.8 |  | 209.9 |  |  |
Derivative liabilities, net | 135.7 |  | 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) | 317 |  | 323 |  | 419 | 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 | 22.60% |  | 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 | 47.1 |  |  |  |  |
Corporate Collateralized Debt Obligations [Member] |  |  |  |  |  |
Five Year CDS Spread Details [Abstract] |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 16.0 |  | 30.4 |  |  |
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities | 15.6 |  | 29.0 |  |  |
Derivative liabilities, net | 0.4 |  | 1.4 |  |  |
Non Corporate Collateralized Debt Obligations And Other Derivative Transactions [Member] |  |  |  |  |  |
Five Year CDS Spread Details [Abstract] |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 276.9 | [1] | 409.7 | [1] |  |
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities | 144.8 | [1] | 178.7 | [1] |  |
Derivative liabilities, net | 132.1 | [1] | 231.0 | [1] |  |
NIMS Related [Member] |  |  |  |  |  |
Five Year CDS Spread Details [Abstract] |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 5.6 | [2] | 5.0 | [2] |  |
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities | 2.4 | [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.

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- Definition CDS Spread (in basis points) to be used in illustrating the market's view of our non-performance risk which we incorporate into our final fair value valuation of Net Liability. + References No definition available. + Details
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- Definition The change in the cumulative impact on the fair value of financial instruments attributable to the market's perception of our non-performance risk. + References No definition available. + Details
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- Details
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- Definition This concept represents the probability that an entity will default within a set number of years. + References No definition available. + Details
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- Definition This concept represents the number of years represented in the entity's CDS spread which is used as an illustration of the market's view of the entity's non-performance risk. This CDS spread isn't used in the valuation of specific fair value liabilities. This valuation of specific fair value liabilities is typically based on the estimated remaining term of the instrument. + References No definition available. + Details
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- Definition Number Of Years In Which The Market Believes Radian Group Will Default + References No definition available. + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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