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Note 10 - Losses and Loss Adjustment Expense Reserve Activity (Details) | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
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Primary Mortgage Product | Mortgage segment |  |  |
Default To Claim Rate Estimate, Gross, For New Defaults | 8.50% | 7.50% | 8.00%

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- 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

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

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