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v3.25.0.1

Segment Reporting - Services Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Total services revenue | $ 50,270 | $ 46,092 | $ 92,216
Contract underwriting services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total services revenue | 1,024 | 1,088 | 1,775
Loan fulfillment services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total services revenue | 0 | 0 | 5,615
Valuation |  |  |
Segment Reporting Information [Line Items] |  |  |
Total services revenue | 15,768 | 14,555 | 30,002
Single family rental |  |  |
Segment Reporting Information [Line Items] |  |  |
Total services revenue | 8,412 | 7,743 | 24,387
Asset management technology platform |  |  |
Segment Reporting Information [Line Items] |  |  |
Total services revenue | 4,924 | 4,639 | 4,814
Real estate owned asset management |  |  |
Segment Reporting Information [Line Items] |  |  |
Total services revenue | 4,455 | 3,960 | 3,091
Other real estate services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total services revenue | 20 | 30 | 115
Title |  |  |
Segment Reporting Information [Line Items] |  |  |
Total services revenue | 13,185 | 11,464 | 18,687
Real Estate Technology |  |  |
Segment Reporting Information [Line Items] |  |  |
Total services revenue | $ 2,482 | $ 2,613 | $ 3,730

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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_ContractUnderwritingServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | rdn_ServicesRevenueAxis=rdn_LoanFulfillmentServicesMember
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: |