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Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Statement [Abstract] |  |  |
Insured derivative recoveries, insurance claims, and VIEs | $ (8,278) | $ 20,842 | $ 35,826

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- Definition Insured Derivative Recoveries, Insurance Claims, And VIEs + References No definition available. + Details
Name: | rdn_InsuredDerivativeRecoveriesInsuranceClaimsAndVIEs
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeStatementAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration