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Note 12 - Income Taxes Summary of Income Tax Examinations (Details) (Internal Revenue Service (IRS) [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Sep. 04, 2014 | May 03, 2010 | Jun. 30, 2008
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Income Tax Examination [Line Items] |  |  |  |
Income Tax Examination, Amount of Claimed Income Tax Refund Being Disallowed for Tax Years 2006 and 2007 |  | $ 105 rdn_IncomeTaxExaminationAmountofClaimedIncomeTaxRefundBeingDisallowedforTaxYears2006and2007 |  |
REMIC Residual [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Qualified Deposit With The U.S. Department Of Treasury Relating to Tax Years 2000 Through 2004 |  |  |  | 85 rdn_QualifiedDepositWithUSDepartmentOfTreasuryRelatingToTaxYears2000Through2004 / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis = rdn_REMICResidualMember
Qualified Deposit With The U.S. Department Of Treasury Relating To Tax Years 2005 Through 2007 |  |  | 4 rdn_QualifiedDepositWithUSDepartmentOfTreasuryRelatingToTaxYears2005Through2007 / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis = rdn_REMICResidualMember |
Income Tax Examination, Notice of Deficiency, Amounts Related to Unpaid Taxes and Penalties |  | 157 rdn_IncomeTaxExaminationNoticeofDeficiencyAmountsRelatedtoUnpaidTaxesandPenalties / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis = rdn_REMICResidualMember |  |
Income Tax Examination, Estimated Interest on Notice of Deficiency Amounts | 118 rdn_IncomeTaxExaminationEstimatedInterestonNoticeofDeficiencyAmounts / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis = rdn_REMICResidualMember |  |  |
Income Tax Examination, Proposed State Liabilities Resulting from IRS Examination of Tax Years 2000 Through 2007 | $ 30 rdn_IncomeTaxExaminationEstimatedStateTaxLiabilitiesResultingfromIRSExaminationofTaxYears2000Through2007 / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis = rdn_REMICResidualMember |  |  |

X
- Definition This concept represents an amount identified in a Notice of Deficiency from the IRS related to an income tax examination where the use of a NOL carryback is being denied. + References No definition available. + Details
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- Definition This concept represents the estimated interest on amounts assessed by the IRS on the Notice of Deficiency received as part of an income tax examination. + References No definition available. + Details
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- Definition The amount of estimated state tax liabilities as of the balance sheet date arising from IRS examinations for tax years 2000 through 2007. + References No definition available. + Details
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- Definition This concept represents the amount assessed by the IRS in the Notice of Deficiency related to unpaid taxes and penalties based on the outcome of an income tax examination. + References No definition available. + Details
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- Definition This concept represents qualified deposits made with the United States Department of Treasury relating to proposed adjustments to the entity's tax losses and deductions based on examinations by the Internal Revenue Department. + References No definition available. + Details
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- Definition Qualified Deposit With The U.S. Department Of Treasury Relating To Tax Years 2005 Through 2007 + References No definition available. + Details
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- Details
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