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Note 5 - Investments Schedule of Contractual Maturities (Details) (USD $)
 21 Months Ended 39 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Aug. 29, 2017
Available-for-sale Securities, Amortized Cost        
Available-for-sale Debt Securities, Amortized Cost Basis $ 677,040,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis $ 677,040,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis $ 528,660,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis  
Available-for-sale Securities, Fair Value        
Available-for-sale securities, fair value 695,085,000us-gaap_AvailableForSaleSecuritiesDebtSecurities 695,085,000us-gaap_AvailableForSaleSecuritiesDebtSecurities 536,890,000us-gaap_AvailableForSaleSecuritiesDebtSecurities  
Debt Securities        
Available-for-sale Securities, Amortized Cost        
Available-for-sale Debt Securities, Amortized Cost Basis 677,040,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		 677,040,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		    
Available-for-sale Securities, Fair Value        
Available-for-sale securities, fair value 695,085,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		 695,085,000us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		    
Non Asset Backed Security Investments, Contractual Maturities        
Available-for-sale Securities, Amortized Cost        
Due in one year or less 2,262,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1] 2,262,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]    
Due after one year through five years 44,413,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1] 44,413,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]    
Due after five years through ten years 257,586,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1] 257,586,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]    
Due after ten years 142,646,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1] 142,646,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]    
Available-for-sale Securities, Fair Value        
Due in one year or less 2,297,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1] 2,297,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]    
Due after one year through five years 44,741,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1] 44,741,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]    
Due after five years through ten years 263,269,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1] 263,269,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]    
Due after ten years 151,323,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1] 151,323,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]    
RMBS        
Available-for-sale Securities, Amortized Cost        
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 40,334,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 [2] 40,334,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 [2]    
Available-for-sale Securities, Fair Value        
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 41,845,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 [2] 41,845,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 [2]    
CMBS        
Available-for-sale Securities, Amortized Cost        
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 67,194,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 [2] 67,194,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 [2]    
Available-for-sale Securities, Fair Value        
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 69,373,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 [2] 69,373,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 [2]    
Other ABS        
Available-for-sale Securities, Amortized Cost        
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 122,605,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_AssetBackedSecuritiesMember		 [2] 122,605,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_AssetBackedSecuritiesMember		 [2]    
Available-for-sale Securities, Fair Value        
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 122,237,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_AssetBackedSecuritiesMember		 [2] 122,237,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_AssetBackedSecuritiesMember		 [2]    
Mortgage Insurance Segment | 2013 Freddie Mac Agreement [Member] | Minimum [Member] | Scenario, Forecast [Member]        
Available-for-sale Securities, Fair Value        
Restricted Investments Held as Collateral for Master Transaction Agreement, Net       205,000,000rdn_RestrictedInvestmentsHeldasCollateralforMasterTransactionAgreementNet
/ rdn_CapitalAndLiquidityAxis
= rdn_A2013FreddieMacAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Radian Guaranty Inc [Member] | 2013 Freddie Mac Agreement [Member]        
Available-for-sale Securities, Fair Value        
Restricted Investments Held as Collateral for Master Transaction Agreement, Net 210,300,000rdn_RestrictedInvestmentsHeldasCollateralforMasterTransactionAgreementNet
/ rdn_CapitalAndLiquidityAxis
= rdn_A2013FreddieMacAgreementMember
/ dei_LegalEntityAxis
= rdn_RadianGuarantyIncMember		 210,300,000rdn_RestrictedInvestmentsHeldasCollateralforMasterTransactionAgreementNet
/ rdn_CapitalAndLiquidityAxis
= rdn_A2013FreddieMacAgreementMember
/ dei_LegalEntityAxis
= rdn_RadianGuarantyIncMember		 209,300,000rdn_RestrictedInvestmentsHeldasCollateralforMasterTransactionAgreementNet
/ rdn_CapitalAndLiquidityAxis
= rdn_A2013FreddieMacAgreementMember
/ dei_LegalEntityAxis
= rdn_RadianGuarantyIncMember		  
Primary Mortgage Product [Member] | First Lien Position [Member] | Mortgage Insurance Segment | 2013 Freddie Mac Agreement [Member]        
Available-for-sale Securities, Fair Value        
Final Loss Mitigation Activity 122,000,000rdn_FinalLossMitigationActivity
/ rdn_CapitalAndLiquidityAxis
= rdn_A2013FreddieMacAgreementMember
/ rdn_MortgageInsuranceDescriptionAxis
= rdn_FirstLienPositionMember
/ us-gaap_ProductOrServiceAxis
= rdn_PrimaryMortgageProductMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember		      
Not Final Loss Mitigation Activity   $ 18,000,000rdn_NotFinalLossMitigationActivity
/ rdn_CapitalAndLiquidityAxis
= rdn_A2013FreddieMacAgreementMember
/ rdn_MortgageInsuranceDescriptionAxis
= rdn_FirstLienPositionMember
/ us-gaap_ProductOrServiceAxis
= rdn_PrimaryMortgageProductMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember		    
[1] Actual maturities may differ as a result of calls before scheduled maturity.
[2] RMBS, CMBS, and Other ABS are shown separately, as they are not due at a single maturity date.