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Note 6 - Investments Investments In Any Person And Its Affiliates That Exceed 10% of Total Stockholders' Equity (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Aug. 29, 2017
Debt Securities      
Investment Holdings [Line Items]      
Assets Held by Insurance Regulators $ 12.1us-gaap_AssetsHeldByInsuranceRegulators
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		 $ 12.1us-gaap_AssetsHeldByInsuranceRegulators
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		  
Radian Guaranty Inc [Member] | 2013 Freddie Mac Agreement [Member]      
Investment Holdings [Line Items]      
Restricted Investments Held as Collateral for Master Transaction Agreement, Net 209.3rdn_RestrictedInvestmentsHeldasCollateralforMasterTransactionAgreementNet
/ rdn_CapitalAndLiquidityAxis
= rdn_A2013FreddieMacAgreementMember
/ dei_LegalEntityAxis
= rdn_RadianGuarantyIncMember		 206.8rdn_RestrictedInvestmentsHeldasCollateralforMasterTransactionAgreementNet
/ rdn_CapitalAndLiquidityAxis
= rdn_A2013FreddieMacAgreementMember
/ dei_LegalEntityAxis
= rdn_RadianGuarantyIncMember		  
Minimum [Member]      
Investment Holdings [Line Items]      
Investment as a Percentage of Total Stockholder's Equity 10.00%rdn_InvestmentasaPercentageofTotalStockholdersEquity
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Subsequent Event [Member] | Minimum [Member] | Mortgage Insurance Segment | 2013 Freddie Mac Agreement [Member]      
Investment Holdings [Line Items]      
Restricted Investments Held as Collateral for Master Transaction Agreement, Net     $ 205.0rdn_RestrictedInvestmentsHeldasCollateralforMasterTransactionAgreementNet
/ rdn_CapitalAndLiquidityAxis
= rdn_A2013FreddieMacAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember