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Note 10 - Losses and Loss Adjustment Expense Mortgage Insurance Reserve Assumptions (Details) - Mortgage Insurance Segment - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
Default To Claim Rate Estimate, Gross, For New Defaults |  |  | 9.50%
Decrease To Our Loss Reserves Due To Estimated Rescissions And Denials | $ 32.0 | $ 32.0 |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount | $ 10.4 | $ 11.3 |
Primary Mortgage Product |  |  |
Weighted Average Default To Claim Rate Assumption Net Of Denials Rescissions and Reinstatements | 33.00% |  |
Default To Claim Rate Estimate, Gross, For New Defaults | 8.00% |  |
Default To Claim Rate Estimate, Gross, For Pre-Foreclosure Stage Defaults | 68.00% |  |
Default To Claim Estimate, Gross, For Foreclosure Stage Defaults | 72.00% |  |

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- Definition This concept represents the decrease to our loss reserve estimate related to our assumption for future rescinded policies and claim denials. + References No definition available. + Details
Name: | rdn_DecreaseToOurLossReservesDueToEstimatedRescissionsAndDenials
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This concept represents the rate at which defaulted loans that have reached the stage where the foreclosure sale has been scheduled or held are expected to result in a claim. + References No definition available. + Details
Name: | rdn_DefaultToClaimEstimateGrossForForeclosureStageDefaults
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This concept represents the rate at which newly reported defaulted loans are expected to result in a claim. + References No definition available. + Details
Name: | rdn_DefaultToClaimRateEstimateGrossForNewDefaults
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This concept represents the rate at which defaulted loans that have not yet reached the foreclosure stage are expected to result in a claim. + References No definition available. + Details
Name: | rdn_DefaultToClaimRateEstimateGrossForPreForeclosureStageDefaults
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The concept represents the rate at which defaulted loans are expected to result in claim net of denials, rescissions and reinstatements. + References No definition available. + Details
Name: | rdn_WeightedAverageDefaultToClaimRateAssumptionNetOfDenialsRescissionsAndReinstatements
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.W) -URI http://asc.fasb.org/extlink&oid=27015833&loc=d3e570705-122907 + Details
Name: | us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredButNotReportedIBNRClaimsAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | srt_ProductOrServiceAxis=rdn_PrimaryMortgageProductMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |