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Note 17 - Share-Based Compensation and Other Benefit Programs - Benefit Plans (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Contribution Plan Maximum Percentage Of Base Earnings Qualifying For Pre-Tax Contributions | 100.00% |  |
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount | $ 19,500 |  |
Defined Benefit Plan, Employee Discretionary Contribution Maximum Catch-up Amount | $ 6,500 |  |
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 | $ 7,800,000 | $ 5,600,000 | $ 6,100,000

X
- 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
Name: | rdn_DefinedContributionPlanEmployeeDiscretionaryContributionMaximumAmount
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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

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

X
- 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