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v3.25.1

Segment Reporting - Services Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Segment Reporting Information [Line Items] |  |
Total services revenue | $ 12,116 | $ 12,588
Contract underwriting services |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | 173 | 210
Valuation |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | 3,780 | 4,475
Single family rental |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | 1,850 | 2,360
Asset management technology platform |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | 1,277 | 1,200
Real estate owned asset management |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | 1,143 | 1,149
Other real estate services |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | 5 | 9
Title |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | 3,261 | 2,573
Real Estate Technology |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | $ 627 | $ 612

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- Definition The total net amount of mortgage and real estate services revenue from our Services segment. + References No definition available. + Details
Name: | rdn_ServicesRevenueNet
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | rdn_ServicesRevenueAxis=rdn_MortgageServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | rdn_ServicesRevenueAxis=rdn_ValuationServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | rdn_ServicesRevenueAxis=rdn_SingleFamilyRentalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | rdn_ServicesRevenueAxis=rdn_AssetmanagementservicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | rdn_ServicesRevenueAxis=rdn_RealEstateOwnedREOAssetManagementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | rdn_ServicesRevenueAxis=rdn_RealEstateAgentServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | rdn_ServicesRevenueAxis=rdn_TitleServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | rdn_ServicesRevenueAxis=rdn_OtherTechnologyServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |