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Note 17 - Commitments and Contingencies Contract Underwriting (Details) - Mortgage Insurance Segment $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($)
Contract Underwriting [Line Items] |
Losses Paid For Contract Underwriting Remedies | $ 0.0
Provision For Contract underwriting Expense | 0.6
Reserve For Contract Underwriting Obligations | $ 0.3

X
- Definition Contract Underwriting [Line Items] + References No definition available. + Details
Name: | rdn_ContractUnderwritingLineItems
Namespace Prefix: | rdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Losses Paid For Contract Underwriting Remedies + References No definition available. + Details
Name: | rdn_LossesPaidForContractUnderwritingRemedies
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This concept represents the amount of provision for contract underwriting remedies for the reporting period. + References No definition available. + Details
Name: | rdn_ProvisionForContractUnderwritingExpense
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Reserve For Contract Underwriting Obligations + References No definition available. + Details
Name: | rdn_ReserveForContractUnderwritingObligations
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rdn_MortgageInsuranceSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |