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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 | $ 677,040,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis |  | $ 677,040,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis |  | $ 528,660,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis |
Available-for-sale Securities, Fair Value |  |  |  |  |  |
Available-for-sale securities, fair value | 695,085,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities |  | 695,085,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities |  | 536,890,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities |
Debt Securities |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 677,040,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_DebtSecurityAxis = us-gaap_DebtSecuritiesMember |  | 677,040,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_DebtSecurityAxis = us-gaap_DebtSecuritiesMember |  |  |
Available-for-sale Securities, Fair Value |  |  |  |  |  |
Available-for-sale securities, fair value | 695,085,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_DebtSecurityAxis = us-gaap_DebtSecuritiesMember |  | 695,085,000 us-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 | 2,262,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost / us-gaap_DebtSecurityAxis = rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember | [1] | 2,262,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost / us-gaap_DebtSecurityAxis = rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember | [1] |  |
Due after one year through five years | 44,413,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost / us-gaap_DebtSecurityAxis = rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember | [1] | 44,413,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost / us-gaap_DebtSecurityAxis = rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember | [1] |  |
Due after five years through ten years | 257,586,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost / us-gaap_DebtSecurityAxis = rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember | [1] | 257,586,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost / us-gaap_DebtSecurityAxis = rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember | [1] |  |
Due after ten years | 142,646,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost / us-gaap_DebtSecurityAxis = rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember | [1] | 142,646,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost / us-gaap_DebtSecurityAxis = rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember | [1] |  |
Available-for-sale Securities, Fair Value |  |  |  |  |  |
Due in one year or less | 2,297,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_DebtSecurityAxis = rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember | [1] | 2,297,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_DebtSecurityAxis = rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember | [1] |  |
Due after one year through five years | 44,741,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / us-gaap_DebtSecurityAxis = rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember | [1] | 44,741,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / us-gaap_DebtSecurityAxis = rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember | [1] |  |
Due after five years through ten years | 263,269,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / us-gaap_DebtSecurityAxis = rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember | [1] | 263,269,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / us-gaap_DebtSecurityAxis = rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember | [1] |  |
Due after ten years | 151,323,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue / us-gaap_DebtSecurityAxis = rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember | [1] | 151,323,000 us-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 | 40,334,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | [2] | 40,334,000 us-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 | 41,845,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_DebtSecurityAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | [2] | 41,845,000 us-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 | 67,194,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | [2] | 67,194,000 us-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 | 69,373,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_DebtSecurityAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | [2] | 69,373,000 us-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 | 122,605,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_AssetBackedSecuritiesMember | [2] | 122,605,000 us-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 | 122,237,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue / us-gaap_DebtSecurityAxis = us-gaap_AssetBackedSecuritiesMember | [2] | 122,237,000 us-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 |  |  |  |  |  | 205,000,000 rdn_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 | 210,300,000 rdn_RestrictedInvestmentsHeldasCollateralforMasterTransactionAgreementNet / rdn_CapitalAndLiquidityAxis = rdn_A2013FreddieMacAgreementMember / dei_LegalEntityAxis = rdn_RadianGuarantyIncMember |  | 210,300,000 rdn_RestrictedInvestmentsHeldasCollateralforMasterTransactionAgreementNet / rdn_CapitalAndLiquidityAxis = rdn_A2013FreddieMacAgreementMember / dei_LegalEntityAxis = rdn_RadianGuarantyIncMember |  | 209,300,000 rdn_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 | 122,000,000 rdn_FinalLossMitigationActivity / rdn_CapitalAndLiquidityAxis = rdn_A2013FreddieMacAgreementMember / rdn_MortgageInsuranceDescriptionAxis = rdn_FirstLienPositionMember / us-gaap_ProductOrServiceAxis = rdn_PrimaryMortgageProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Not Final Loss Mitigation Activity |  |  | $ 18,000,000 rdn_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.

X
- Definition Loss mitigation activities (including rescinding and canceling policy coverage as well as denying and curtailing claim payments based on criteria included in the applicable master policy) which have passed the contractual limitation periods for providing appropriate documentation for perfecting the claim and therefore are considered final rescissions, denials, cancellations or curtailments. + References No definition available. + Details
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- Definition Loss mitigation activities (including rescinding and cancelling policy coverage as well as denying and curtailing claim payments based on criteria included in the applicable master policy) which have not reached the contractual limitation periods for providing appropriate documentation for perfecting the claim and therefore cannot be considered as final rescissions, denials, cancellations or curtailments. + References No definition available. + Details
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- Definition Investments restricted as to use but included in the marketable securities categories of an unclassified balance sheet, net of final loss mitigation activity. + References No definition available. + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount of available-for-sale debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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