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Note 16 - Subsequent Events 2018 Single Premium QSR Transaction (Details) - 2018 Single Premium QSR [Member] - Scenario, Forecast [Member] $ in Millions | 1 Months Ended
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Oct. 31, 2017 USD ($) reinsurer
Subsequent Event [Line Items] |
Third-Party Reinsurers | reinsurer | 8
Percentage of NIW Able to be Ceded Under QSA | 65.00%
Ceded Premiums Written | $ | $ 335
Ceded Insurance Commission Percentage | 25.00%
Maximum [Member] |
Subsequent Event [Line Items] |
Loss Ratio | 56.00%

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- Definition Ceded Insurance Commission Percentage + References No definition available. + Details
Name: | rdn_CededInsuranceCommissionPercentage
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of third-party reinsurers with whom the company has entered into a quota-share reinsurance transaction. + References No definition available. + Details
Name: | rdn_NumberofThirdPartyReinsurers
Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage of NIW Able to be Ceded Under QSA + References No definition available. + Details
Name: | rdn_PercentageofNIWAbletobeCededUnderQSA
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of written premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
Name: | us-gaap_CededPremiumsWritten
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Ratio of non-life losses and loss expenses to non-life net premiums earned. + References No definition available. + Details
Name: | us-gaap_LossRatio
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CededCreditRiskAxis=rdn_A2018SinglePremiumQSRMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |