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Note 13 - Income Taxes Summary of Income Tax Examinations (Details) (Internal Revenue Service (IRS) [Member], USD $) In Millions, unless otherwise specified | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2014 | May 03, 2010 | Jun. 30, 2008
Internal Revenue Service (IRS) [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Proposed Increase To Tax Liability Resulting From I.R.S. Examination Of Tax Years 2000 Through 2007 | $ 128 |  |
Income Tax Examination, Proposed Penalties | 42 |  |
Qualified Deposit With The U.S. Department Of Treasury Relating to Tax Years 2000 Through 2004 |  |  | 85
Qualified Deposit With The U.S. Department Of Treasury Relating To Tax Years 2005 Through 2007 |  | $ 4 |
Number of Days Company Has to Respond to IRS Office of Appeals Deficiency Notice | 90 days |  |

X
- Definition The amount of estimated proposed penalties as of the balance sheet date arising from income tax examinations for tax years 2000 through 2007. + References No definition available. + Details
Name: | rdn_IncomeTaxExaminationProposedPenaltiesResultingFromIrsExaminationOfTaxYears2000Through2007
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of Days Company Has to Respond to IRS Office of Appeals Deficiency Notice with payment of assessed tax liabilities, penalties and interest or to petition the US Tax Court to litigate. + References No definition available. + Details
Name: | rdn_NumberOfDaysCompanyHasToRespondToIrsOfficeOfAppealsDeficiencyNotice
Namespace Prefix: | rdn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition This concept represents the proposed Increase an entities tax liability resulting from an IRS examination excluding interest and penalties. + References No definition available. + Details
Name: | rdn_ProposedIncreaseToTaxLiabilityResultingFromIRSExaminationOfTaxYears2000Through2007
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | rdn_QualifiedDepositWithUSDepartmentOfTreasuryRelatingToTaxYears2000Through2004
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Qualified Deposit With The U.S. Department Of Treasury Relating To Tax Years 2005 Through 2007 + References No definition available. + Details
Name: | rdn_QualifiedDepositWithUSDepartmentOfTreasuryRelatingToTaxYears2005Through2007
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeTaxExaminationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration