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Note 16 - Benefit Plans (Details) - Other Postretirement Benefits Plan - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined Contribution Plan Maximum Percentage Of Base Earnings Qualifying For Pre-Tax Contributions | 100.00% |  |
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount | $ 19,000 |  |
Defined Benefit Plan, Employee Discretionary Contribution Maximum Catch-up Amount | $ 6,000 |  |
Defined Contribution Plan Parent Company Matching Contribution Percentage | 100.00% |  |
Defined Contribution Plan Percentage Of Base Earnings Qualifying For Parent Company Matching Contribution | 6.00% |  |
Defined Contribution Plan, Cost | $ 5,600,000 | $ 6,100,000 | $ 4,800,000
Defined Contribution Plan, Employer Matching Contribution, Arrangement with Individual Requisite Service Period | 3 years |  |

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- Definition This concept represents the maximum amount of discretionary contributions made by an employee to a defined contribution plan based on the employee being or reaching age 50 during the plan year. + References No definition available. + Details
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Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the period over which an employee is required to provide service before the company will make discretionary, pro rata (based on eligible pay) cash allocations to each eligible participant’s account, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | rdn_DefinedContributionPlanEmployerMatchingContributionArrangementwithIndividualRequisiteServicePeriod
Namespace Prefix: | rdn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_DefinedContributionPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |