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Note 1 - Condensed Consolidated Financial Statements - Basis of Presentation and Business Overview Capital and Liquidity (Details) (USD $) | 3 Months Ended | 0 Months Ended
--- | --- | ---
Mar. 31, 2015 segment | Apr. 01, 2015
Business Overview [Abstract] |  |
Number of Operating Segments | 2 us-gaap_NumberOfOperatingSegments |
Mortgage Insurance Segment |  |
Mortgage Insurance [Abstract] |  |
Private Mortgage Insurance Protects Lenders For Loans Made With Less Than This Maximum Down Payment Percentage | 20.00%rdn_PrivateMortgageInsuranceProtectsLendersForLoansMadeWithLessThanThisMaximumDownPaymentPercentage / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |
Percentage Of Primary Insurance On Domestic First-Lien Mortgages To Total Risk In Force | 97.30%rdn_PercentageOfPrimaryInsuranceOnDomesticFirstLienMortgagesToTotalRiskInForce / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |
First Lien Primary Mortgage Insurance Risk In Force | 44,600,000,000 rdn_RiskInForce / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |
Percentage Of Pool Insurance On Domestic First-Lien Mortgages To Total Risk In Force | 2.60%rdn_PercentageOfPoolInsuranceOnDomesticFirstLienMortgagesToTotalRiskInForce / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |
Bank of America Settlement Agreement [Member] | Mortgage Insurance Segment |  |
BAC Settlement Agreement [Abstract] |  |
Loss Contingency, Settlement Agreement, Percentage of Subject Loans Not Held by Insureds or Are Non-GSE Investors | 12.00%rdn_LossContingencySettlementAgreementPercentageofSubjectLoansNotHeldbyInsuredsorAreNonGSEInvestors / us-gaap_LitigationCaseAxis = rdn_BankofAmericaSettlementAgreementMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |
Minimum [Member] |  |
Basis of Presentation and Business Overview [Line Items] |  |
Equity Method Investment, Ownership Percentage | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum [Member] |  |
Basis of Presentation and Business Overview [Line Items] |  |
Equity Method Investment, Ownership Percentage | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |
Subsequent Event [Member] | Sale of Radian Asset Assurance [Member] | Parent Company |  |
Business Overview [Abstract] |  |
Sale of Stock, Percentage of Ownership before Transaction |  | 100.00%us-gaap_SaleOfStockPercentageOfOwnershipBeforeTransaction / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_SaleofRadianAssetAssuranceMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Mortgage Insurance [Abstract] |  |
Disposal Group, Including Discontinued Operation, Consideration |  | 810,000,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_SaleofRadianAssetAssuranceMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds |  | $ 789,000,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_SaleofRadianAssetAssuranceMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X
- Details
Name: | rdn_BACSettlementAgreementAbstract
Namespace Prefix: | rdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | rdn_BasisofPresentationandBusinessOverviewLineItems
Namespace Prefix: | rdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | rdn_BusinessOverviewAbstract
Namespace Prefix: | rdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This concept represents the percentage of total loans included in the settlement agreement that were either (1) not held in portfolio by the insureds, or (2) purchased by Non-GSE investors. + References No definition available. + Details
Name: | rdn_LossContingencySettlementAgreementPercentageofSubjectLoansNotHeldbyInsuredsorAreNonGSEInvestors
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | rdn_MortgageInsuranceAbstract
Namespace Prefix: | rdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Pool Insurance On Domestic First-Lien Mortgages To Total Risk In Force + References No definition available. + Details
Name: | rdn_PercentageOfPoolInsuranceOnDomesticFirstLienMortgagesToTotalRiskInForce
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage Of Primary Insurance On Domestic First-Lien Mortgages To Total Risk In Force + References No definition available. + Details
Name: | rdn_PercentageOfPrimaryInsuranceOnDomesticFirstLienMortgagesToTotalRiskInForce
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the maximum down payment percentage on a home's purchase price that is used to measure the need for private mortgage insurance. + References No definition available. + Details
Name: | rdn_PrivateMortgageInsuranceProtectsLendersForLoansMadeWithLessThanThisMaximumDownPaymentPercentage
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Risk In Force + References No definition available. + Details
Name: | rdn_RiskInForce
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of subsidiary's or equity investee's stock owned by parent company before stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPercentageOfOwnershipBeforeTransaction
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The value of all consideration given or received by the Entity in the significant acquisition or disposal. + References No definition available. + Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_LitigationCaseAxis=rdn_BankofAmericaSettlementAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rdn_MortgageInsuranceSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |