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Note 4 - Segment Reporting Reconciliation of Segment to Consolidated Results Pretax (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Operating Income (Loss) Pre-Tax Non-GAAP                 $ 342,382,000rdn_OperatingIncomeLossPreTaxNonGAAP $ (67,435,000)rdn_OperatingIncomeLossPreTaxNonGAAP $ (395,253,000)rdn_OperatingIncomeLossPreTaxNonGAAP
Derivative, Gain on Derivative                 0us-gaap_DerivativeGainOnDerivative 635,000us-gaap_DerivativeGainOnDerivative  
Derivative, Loss on Derivative                     (192,000)us-gaap_DerivativeLossOnDerivative
Change In Present Value of Estimated Credit Loss Payments                 (113,000)rdn_ChangeInPresentValueofEstimatedCreditLossPayments 21,000rdn_ChangeInPresentValueofEstimatedCreditLossPayments (933,000)rdn_ChangeInPresentValueofEstimatedCreditLossPayments
Change in Fair Value of Derivative Instruments Expected to Reverse Over Time                 113,000rdn_ChangeinFairValueofDerivativeInstrumentsExpectedtoReverseOverTime 614,000rdn_ChangeinFairValueofDerivativeInstrumentsExpectedtoReverseOverTime 741,000rdn_ChangeinFairValueofDerivativeInstrumentsExpectedtoReverseOverTime
Net gains (losses) on investments 18,658,000us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments [1] (6,308,000)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments [1] 28,233,000us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments [1] 43,286,000us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments [1] (2,631,000)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments [1] (6,366,000)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments [1] (86,808,000)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments [1] (3,140,000)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments [1] 83,869,000us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments [1] (98,945,000)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments [1] 114,282,000us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments
Net (losses) gains on other financial instruments (675,000)rdn_NetGainsLossesOnOtherFinancialInstruments 14,000rdn_NetGainsLossesOnOtherFinancialInstruments (2,901,000)rdn_NetGainsLossesOnOtherFinancialInstruments (318,000)rdn_NetGainsLossesOnOtherFinancialInstruments (2,208,000)rdn_NetGainsLossesOnOtherFinancialInstruments (193,000)rdn_NetGainsLossesOnOtherFinancialInstruments 60,000rdn_NetGainsLossesOnOtherFinancialInstruments (5,239,000)rdn_NetGainsLossesOnOtherFinancialInstruments (3,880,000)rdn_NetGainsLossesOnOtherFinancialInstruments (7,580,000)rdn_NetGainsLossesOnOtherFinancialInstruments 7,802,000rdn_NetGainsLossesOnOtherFinancialInstruments
Business Combination, Acquisition Related Costs                 (6,680,000)us-gaap_BusinessCombinationAcquisitionRelatedCosts 0us-gaap_BusinessCombinationAcquisitionRelatedCosts 0us-gaap_BusinessCombinationAcquisitionRelatedCosts
Increase (Decrease) in Goodwill and Intangible Assets (5,354,000)rdn_IncreaseDecreaseinGoodwillandIntangibleAssets (3,294,000)rdn_IncreaseDecreaseinGoodwillandIntangibleAssets 0rdn_IncreaseDecreaseinGoodwillandIntangibleAssets 0rdn_IncreaseDecreaseinGoodwillandIntangibleAssets         (8,648,000)rdn_IncreaseDecreaseinGoodwillandIntangibleAssets 0rdn_IncreaseDecreaseinGoodwillandIntangibleAssets 0rdn_IncreaseDecreaseinGoodwillandIntangibleAssets
Pretax Income (Loss) from Continuing Operations Attributable to Parent                 407,156,000rdn_PretaxIncomeLossfromContinuingOperationsAttributabletoParent (173,346,000)rdn_PretaxIncomeLossfromContinuingOperationsAttributabletoParent (272,428,000)rdn_PretaxIncomeLossfromContinuingOperationsAttributabletoParent
Mortgage Insurance Segment                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Entity Wide Revenue, Major Customer, Number of Customers         1rdn_EntityWideRevenueMajorCustomerNumberOfCustomers
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
        1rdn_EntityWideRevenueMajorCustomerNumberOfCustomers
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
1rdn_EntityWideRevenueMajorCustomerNumberOfCustomers
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
Operating Income (Loss) Pre-Tax Non-GAAP                 336,936,000rdn_OperatingIncomeLossPreTaxNonGAAP
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
[2],[3] (67,435,000)rdn_OperatingIncomeLossPreTaxNonGAAP
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
[2] (395,253,000)rdn_OperatingIncomeLossPreTaxNonGAAP
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
[2]
Change In Present Value of Estimated Credit Loss Payments                 113,000rdn_ChangeInPresentValueofEstimatedCreditLossPayments
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
(21,000)rdn_ChangeInPresentValueofEstimatedCreditLossPayments
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
933,000rdn_ChangeInPresentValueofEstimatedCreditLossPayments
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
Costs and Expenses, Related Party                 800,000us-gaap_CostsAndExpensesRelatedParty
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
   
Mortgage and Real Estate Services Segment [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Operating Income (Loss) Pre-Tax Non-GAAP                 5,446,000rdn_OperatingIncomeLossPreTaxNonGAAP
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
[4],[5] 0rdn_OperatingIncomeLossPreTaxNonGAAP
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
0rdn_OperatingIncomeLossPreTaxNonGAAP
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
Change In Present Value of Estimated Credit Loss Payments                 0rdn_ChangeInPresentValueofEstimatedCreditLossPayments
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
[5]    
Revenue from Related Parties                 $ 800,000us-gaap_RevenueFromRelatedParties
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
   
Geographic Concentration Risk [Member] | CALIFORNIA | Primary Risk In Force [Member] | Mortgage Insurance Segment                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Concentration Risk, Percentage                 13.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_PrimaryRiskInForceMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
13.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_PrimaryRiskInForceMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
 
Geographic Concentration Risk [Member] | CALIFORNIA | Pool Risk in Force [Member] | Mortgage Insurance Segment                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Concentration Risk, Percentage                 9.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_PoolRiskInForceMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_PoolRiskInForceMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
 
Geographic Concentration Risk [Member] | CALIFORNIA | New Insurance Written [Member] | Mortgage Insurance Segment                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Concentration Risk, Percentage                 17.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_NewInsuranceWrittenMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
18.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_NewInsuranceWrittenMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
17.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_NewInsuranceWrittenMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
Minimum [Member] | Geographic Concentration Risk [Member] | CALIFORNIA | Primary Risk In Force [Member] | Mortgage Insurance Segment                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Concentration Risk, Percentage                 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_PrimaryRiskInForceMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
   
Customer A [Member] | Customer Concentration Risk [Member] | New Insurance Written [Member] | Mortgage Insurance Segment                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Concentration Risk, Percentage                 4.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_NewInsuranceWrittenMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= rdn_CustomerAMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
5.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_NewInsuranceWrittenMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= rdn_CustomerAMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
6.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_NewInsuranceWrittenMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= rdn_CustomerAMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
Customer B [Member] | Earned Premium Benchmark, Amount [Member] | Mortgage Insurance Segment                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Entity Wide Revenue, Major Customer, Number of Customers 1rdn_EntityWideRevenueMajorCustomerNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_EarnedPremiumBenchmarkAmountMember
/ us-gaap_MajorCustomersAxis
= rdn_CustomerBMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
              1rdn_EntityWideRevenueMajorCustomerNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_EarnedPremiumBenchmarkAmountMember
/ us-gaap_MajorCustomersAxis
= rdn_CustomerBMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
   
Customer B [Member] | Customer Concentration Risk [Member] | Earned Premium Benchmark, Amount [Member] | Mortgage Insurance Segment                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Concentration Risk, Percentage                 19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_EarnedPremiumBenchmarkAmountMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= rdn_CustomerBMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
21.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_EarnedPremiumBenchmarkAmountMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= rdn_CustomerBMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_EarnedPremiumBenchmarkAmountMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= rdn_CustomerBMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
Customer C [Member] | Customer Concentration Risk [Member] | Earned Premium Benchmark, Amount [Member] | Mortgage Insurance Segment                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Concentration Risk, Percentage                     17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= rdn_EarnedPremiumBenchmarkAmountMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= rdn_CustomerCMember
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageInsuranceSegmentMember
[1] The 2014 and 2013 amounts reflect unrealized gains (losses), respectively, on our trading securities.
[2] Includes certain corporate income and expenses that have been reallocated to the mortgage insurance segment for all periods presented, as listed in the preceding detailed tables. These amounts represent items that were previously allocated to the financial guaranty segment but were not reclassified to discontinued operations.
[3] Includes inter-segment expenses of $0.8 million for the year ended December 31, 2014.
[4] Includes inter-segment revenues of $0.8 million for the year ended December 31, 2014.
[5] Includes the acquisition of Clayton, effective June 30, 2014.