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v3.23.1

Segment Reporting - Services Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Segment Reporting Information [Line Items] |  |
Total services revenue | $ 10,984 | $ 29,348
Title |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | 2,554 | 6,403
Valuation |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | 2,881 | 7,969
Single family rental |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | 2,435 | 7,230
Real estate owned asset management |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | 912 | 813
Other real estate services |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | 1 | 1
Asset management technology platform |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | 1,166 | 1,332
Other technology services |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | 699 | 1,048
Mortgage |  |
Segment Reporting Information [Line Items] |  |
Total services revenue | $ 336 | $ 4,552

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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_TitleServicesMember
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_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_AssetmanagementservicesMember
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: |

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