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Note 9 - Losses and LAE Mortgage Insurance Loss Reserves Rollforward (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Deduct paid claims and LAE related to [Abstract] |  |  |  |  |  |  |  |
Add reinsurance recoverables | $ 15,155 us-gaap_ReinsuranceRecoverables |  |  |  | 28,119 us-gaap_ReinsuranceRecoverables |  |  |
Balance at March 31 | 1,384,714 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  | 1,893,960 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  | 1,560,032 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  |  |
Mortgage Insurance Segment |  |  |  |  |  |  |  |
Loss reserve [Roll Forward] |  |  |  |  |  |  |  |
Balance at January 1 | 1,560,032 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 2,164,353 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 2,164,353 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Less reinsurance recoverables | 26,665 us-gaap_ReinsuranceRecoverables / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [1] | 38,363 us-gaap_ReinsuranceRecoverables / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [1] | 38,363 us-gaap_ReinsuranceRecoverables / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [1] |  |
Balance at beginning of period, net of reinsurance recoverables | 1,533,367 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 2,125,990 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 2,125,990 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Add losses and LAE incurred in respect of default notices reported and unreported in [Abstract] |  |  |  |  |  |  |  |
Current year | 80,437 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [2] | 108,849 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [2],[3] |  |  |  |
Prior years | (35,360)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | (59,689)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [3] |  |  |  |
Total incurred losses and LAE | 45,077 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 49,160 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Deduct paid claims and LAE related to [Abstract] |  |  |  |  |  |  |  |
Paid Losses and LAE Current year | 0 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [2] | 0 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [2] |  |  |  |
Paid losses and LAE Prior years | 207,095 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 306,941 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Total paid losses and LAE | 207,095 us-gaap_PaymentsForLossesAndLossAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 306,941 us-gaap_PaymentsForLossesAndLossAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Balance at end of period, net of reinsurance recoverables | 1,371,349 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 1,868,209 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Add reinsurance recoverables | 13,365 us-gaap_ReinsuranceRecoverables / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [1] | 25,751 us-gaap_ReinsuranceRecoverables / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [1] |  |  |  |
Balance at March 31 | 1,384,714 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 1,893,960 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Mortgage Insurance Segment | Primary Mortgage Product [Member] |  |  |  |  |  |  |  |
Default To Claim Rate Detail [Abstract] |  |  |  |  |  |  |  |
Weighted Average Default To Claim Rate Assumption Net Of Denials Rescissions and Reinstatements | 53.00%rdn_WeightedAverageDefaultToClaimRateAssumptionNetOfDenialsRescissionsAndReinstatements / us-gaap_ProductOrServiceAxis = rdn_PrimaryMortgageProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  | 52.00%rdn_WeightedAverageDefaultToClaimRateAssumptionNetOfDenialsRescissionsAndReinstatements / us-gaap_ProductOrServiceAxis = rdn_PrimaryMortgageProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Weighted Average Default To Claim Rate Assumption Excluding Pending Claims Net Of Denials And Rescissions | 47.00%rdn_WeightedAverageDefaultToClaimRateAssumptionExcludingPendingClaimsNetOfDenialsAndRescissions / us-gaap_ProductOrServiceAxis = rdn_PrimaryMortgageProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |  |  |
Default To Claim Rate Estimate, Gross, For New Defaults | 15.00%rdn_DefaultToClaimRateEstimateGrossForNewDefaults / us-gaap_ProductOrServiceAxis = rdn_PrimaryMortgageProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  | 16.00%rdn_DefaultToClaimRateEstimateGrossForNewDefaults / us-gaap_ProductOrServiceAxis = rdn_PrimaryMortgageProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Default To Claim Rate Estimate, Gross, For Pre-Foreclosure Stage Defaults | 65.00%rdn_DefaultToClaimRateEstimateGrossForPreForeclosureStageDefaults / us-gaap_ProductOrServiceAxis = rdn_PrimaryMortgageProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |  |  |
Gross Default To Claim Rate Estimate | 81.00%rdn_DefaultToClaimEstimateGrossForForeclosureStageDefaults / us-gaap_ProductOrServiceAxis = rdn_PrimaryMortgageProductMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |  |  |
Bank of America Settlement Agreement [Member] | Mortgage Insurance Segment |  |  |  |  |  |  |  |
Deduct paid claims and LAE related to [Abstract] |  |  |  |  |  |  |  |
Total paid losses and LAE | 98,500 us-gaap_PaymentsForLossesAndLossAdjustmentExpense / us-gaap_LitigationCaseAxis = rdn_BankofAmericaSettlementAgreementMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |  |  |
Classification Error [Member] | Mortgage Insurance Segment |  |  |  |  |  |  |  |
Add losses and LAE incurred in respect of default notices reported and unreported in [Abstract] |  |  |  |  |  |  |  |
Current year |  |  | (33,800)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = rdn_ClassificationErrorMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | (71,800)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = rdn_ClassificationErrorMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | (65,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = rdn_ClassificationErrorMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | (75,700)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = rdn_ClassificationErrorMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember
Prior years |  |  | $ 33,800 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = rdn_ClassificationErrorMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 71,800 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = rdn_ClassificationErrorMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | $ 65,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = rdn_ClassificationErrorMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | $ 75,700 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = rdn_ClassificationErrorMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember
[1] | Related to ceded losses on captive reinsurance transactions and the QSR Reinsurance Transactions. See Note 7 for additional information.
[2] | Related to underlying defaulted loans with a most recent default notice dated in the year indicated. For example, if a loan had defaulted in a prior year, but then subsequently cured and later re-defaulted in the current year, that default would be considered a current year default.
[3] | Amounts previously reported for losses and LAE incurred in respect of default notices reported and unreported in current year and prior years have been reclassified to correct an error. There was no net change to total incurred losses in any period as a result of these reclassifications. For the three months ended March 31, 2014, the amounts previously reported for losses and LAE incurred in respect of default notices reported and unreported in current year have been revised downward by approximately $33.8 million, with an equal and offsetting adjustment to the amount previously reported for default notices reported and unreported in prior years. For the years ended December 31, 2014, 2013 and 2012, the amounts previously reported related to losses and LAE incurred from current year default notices should have been lower by approximately $71.8 million, $65.0 million and $75.7 million, respectively, with equal and offsetting adjustments to the incurred loss amounts related to prior years’ default notices.

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- Definition This concept represents the rate at which defaulted loans that have reached the stage where the foreclosure sale has been scheduled or held are expected to result in a claim. + References No definition available. + Details
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- Definition This concept represents the rate at which newly reported defaulted loans are expected to result in a claim. + References No definition available. + Details
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- Definition This concept represents the rate at which defaulted loans that have not yet reached the foreclosure stage are expected to result in a claim. + References No definition available. + Details
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- Definition Weighted Average Default To Claim Rate Assumption Excluding Pending Claims Net Of Denials And Rescissions + References No definition available. + Details
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- Definition The concept represents the rate at which defaulted loans are expected to result in claim net of denials, rescissions and reinstatements. + References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of payments to settle claims incurred in the current period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of payments to settle claims incurred in prior periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of expense for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph a -Article 7 + Details
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- Definition Amount of payments to settle insured claims and pay costs incurred in the claims settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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