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Note 15 - Commitments and Contingencies Contingent Claims for Trade Credit and Surety Primary Insurers (Details) (Trade Credit Reinsurance and Surety Insurance [Member]) In Millions, unless otherwise specified | Mar. 31, 2015 Financial Guaranty Segment servicers | Dec. 31, 2014 Radian Asset Assurance [Member] Euro Member Countries, Euro EUR (€) | Dec. 31, 2014 Radian Asset Assurance [Member] United States of America, Dollars USD ($)
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Loss Contingencies [Line Items] |  |  |
Loss Contingency, Claims Received Through Reporting Period |  | € 13.5 rdn_LossContingencyClaimsReceivedThroughReportingPeriod / us-gaap_CurrencyAxis = currency_EUR / dei_LegalEntityAxis = rdn_RadianAssetAssuranceMember / us-gaap_ProductOrServiceAxis = rdn_TradeCreditReinsuranceAndSuretyInsuranceMember | $ 16.4 rdn_LossContingencyClaimsReceivedThroughReportingPeriod / us-gaap_CurrencyAxis = currency_USD / dei_LegalEntityAxis = rdn_RadianAssetAssuranceMember / us-gaap_ProductOrServiceAxis = rdn_TradeCreditReinsuranceAndSuretyInsuranceMember
Number of Servicers Who Have Submitted Claims | 1 rdn_NumberofServicersWhoHaveSubmittedClaims / us-gaap_ProductOrServiceAxis = rdn_TradeCreditReinsuranceAndSuretyInsuranceMember / us-gaap_StatementBusinessSegmentsAxis = rdn_FinancialGuarantySegmentMember |  |

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- Definition The amount of claims received by the entity through the reporting period for a loss contingency. + References No definition available. + Details
Name: | rdn_LossContingencyClaimsReceivedThroughReportingPeriod
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The number of servicers of ceded insurance contracts who have submitted claims to the entity. + References No definition available. + Details
Name: | rdn_NumberofServicersWhoHaveSubmittedClaims
Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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