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Note 13 - Statutory Information Statutory Information (Details) $ in Billions | Sep. 30, 2015 USD ($)
--- | ---
Statutory Accounting Practices [Line Items] |
Restricted Net Assets Held by Consolidated Subsidiaries | $ 2.7

X
- Definition The amount of the entity's restricted net assets which are held by consolidated subsidiaries (entity's investment in subsidiaries). + References No definition available. + Details
Name: | rdn_RestrictedNetAssetsHeldByConsolidatedSubsidiaries
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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_StatutoryAccountingPracticesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration