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Note 16 - Commitments and Contingencies Contract Underwriting (Details) (Mortgage Insurance Segment, USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014
Mortgage Insurance Segment |
Contract Underwriting [Line Items] |
Losses Paid For Contract Underwriting Remedies | $ 1.0
Reserve For Contract Underwriting Obligations | $ 2.6

X
- 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 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