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Note 15 - Commitments and Contingencies Legal Proceedings (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 plaintiff loan | Sep. 04, 2014
Loss Contingencies [Line Items] |  |
Minimum Number of Pending or Threatened Matters That Could Effect Our Results | 1 rdn_MinimumNumberofPendingorThreatenedMattersThatCouldEffectOurResults |
Minimum [Member] |  |
Loss Contingencies [Line Items] |  |
Number Of Home Mortgage Loans Involved In Pending Litigation | 1 rdn_NumberOfHomeMortgageLoansInvolvedInPendingLitigation / us-gaap_RangeAxis = us-gaap_MinimumMember |
Loss Contingency, Number of Plaintiffs Whose Loans Were Insured | 1 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_RangeAxis = us-gaap_MinimumMember |
REMIC Residual [Member] | Internal Revenue Service (IRS) [Member] |  |
Loss Contingencies [Line Items] |  |
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

X
- 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
Name: | rdn_IncomeTaxExaminationNoticeofDeficiencyAmountsRelatedtoUnpaidTaxesandPenalties
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This concept represents the minimum number of currently pending or threatened matters that could potentially impact our results. + References No definition available. + Details
Name: | rdn_MinimumNumberofPendingorThreatenedMattersThatCouldEffectOurResults
Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Home Mortgage Loans Involved In Pending Litigation + References No definition available. + Details
Name: | rdn_NumberOfHomeMortgageLoansInvolvedInPendingLitigation
Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References No definition available. + Details
Name: | us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis=rdn_REMICResidualMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |