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Note 16 - Commitments and Contingencies Employee Related Obligations (Details) (Financial Guaranty Segment, USD $) In Millions, unless otherwise specified | Jun. 30, 2014
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Financial Guaranty Segment |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |
Total Incentive Retention And Severance Agreement Expenses Expected To Be Incurred | $ 11.5
Unrecorded Incentive Retention And Severance Agreement Expenses | $ 1.5

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- Definition Total Incentive Retention And Severance Agreement Expenses Expected To Be Incurred + References No definition available. + Details
Name: | rdn_TotalIncentiveRetentionAndSeveranceAgreementExpensesExpectedToBeIncurred
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unrecorded Incentive Retention And Severance Agreement Expenses + References No definition available. + Details
Name: | rdn_UnrecordedIncentiveRetentionAndSeveranceAgreementExpenses
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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