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Note 3 - Segment Reporting Reconciliation of Segment to Consolidated Results Pretax (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Net Gains/Losses on All Financial Instruments | $ 16,779,000 rdn_NetGainsLossesonAllFinancialInstruments |  | $ 43,107,000 rdn_NetGainsLossesonAllFinancialInstruments | [1]
Business Combination, Acquisition Related Costs | (207,000)us-gaap_BusinessCombinationAcquisitionRelatedCosts |  | 0 us-gaap_BusinessCombinationAcquisitionRelatedCosts |
Amortization and impairment of intangible assets | 3,023,000 rdn_IncreaseDecreaseinGoodwillandIntangibleAssets |  | 0 rdn_IncreaseDecreaseinGoodwillandIntangibleAssets |
Pretax income from continuing operations | 137,450,000 us-gaap_OperatingIncomeLoss |  | 127,097,000 us-gaap_OperatingIncomeLoss |
Mortgage Insurance Segment |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Adjusted pretax operating income (loss) | 125,892,000 rdn_OperatingIncomeLossPreTaxNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [2],[3] | 84,719,000 rdn_OperatingIncomeLossPreTaxNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [2],[3]
Costs and Expenses, Related Party | 900,000 us-gaap_CostsAndExpensesRelatedParty / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Change In Present Value of Estimated Credit Loss Payments |  |  | 139,000 rdn_ChangeInPresentValueofEstimatedCreditLossPayments / 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] |  |  |  |
Adjusted pretax operating income (loss) | (1,991,000)rdn_OperatingIncomeLossPreTaxNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [4] | (729,000)rdn_OperatingIncomeLossPreTaxNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [4]
Revenue from Related Parties | 900,000 us-gaap_RevenueFromRelatedParties / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |
Change In Present Value of Estimated Credit Loss Payments |  |  | 0 rdn_ChangeInPresentValueofEstimatedCreditLossPayments / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |
Mortgage Insurance and Mortgage and Real Estate Services Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Adjusted pretax operating income (loss) | 123,901,000 rdn_OperatingIncomeLossPreTaxNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  | 83,990,000 rdn_OperatingIncomeLossPreTaxNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |
Pretax income from continuing operations | 137,450,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  | 127,097,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |
Change In Present Value of Estimated Credit Loss Payments |  |  | $ 139,000 rdn_ChangeInPresentValueofEstimatedCreditLossPayments / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |
[1] | The change in expected economic loss or recovery associated with our consolidated VIEs is included in adjusted pretax operating income above. Therefore, for purposes of this reconciliation, net gains on investments and other financial instruments has been adjusted by $0.1 million for the three months ended March 31, 2014 to reverse this item, which represents an amount that is not included in net income.
[2] | Includes inter-segment expenses of $0.9 million for the three months ended March 31, 2015.
[3] | 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 former financial guaranty segment, but were not reclassified to discontinued operations.
[4] | Includes inter-segment revenues of $0.9 million for the three months ended March 31, 2015.

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- Definition This concept represents the impact of changes in the present value of insurance claims and recoveries on insured credit derivatives and VIEs, based on the company's ongoing insurance loss monitoring. + References No definition available. + Details
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- Definition The increase (decrease) during the reporting period in goodwill and intangible assets which includes amortization, impairment, etc. + References No definition available. + Details
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- Definition This concept represents the total of net gains/losses on investments, net gains/losses on other financial instruments, and any other gains on financial instruments for the purposes of reconciling net income (loss) from segments to consolidated results. + References No definition available. + Details
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- Definition This concept represents the adjusted pre-tax operating income (loss) for segment reporting (non GAAP) and only includes the revenue and expense items that management considers in assessing the performance of the segment businesses. + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 07 -Paragraph b -Subparagraph 1 -Article 6 + Details
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