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Note 11 - Accumulated Other Comprehensive Income Rollforward of Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Accumulated Other Comprehensive Income, Net of Tax, beginning balance | $ 51,485 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  |
Other Comprehensive Income, Net of Tax [Abstract] |  |  |  |
Net foreign currency translation adjustments | (126)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |
Unrealized holding gains arising during the period | 6,454 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  | 2,669 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |
Less: Reclassification adjustment for net (losses) gains included in net income | (33)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax |  | 4 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax |
Net unrealized gains on investments recorded as assets held for sale | 1,828 rdn_OtherComprehensiveIncomeLossNetofTaxUnrealizedGainsLossesonInvestmentsRecordedasAssetsHeldforSale |  | 1,296 rdn_OtherComprehensiveIncomeLossNetofTaxUnrealizedGainsLossesonInvestmentsRecordedasAssetsHeldforSale |
Other comprehensive income | 8,189 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  | 3,961 us-gaap_OtherComprehensiveIncomeLossNetOfTax |
Other Comprehensive Income (Loss), Net of Tax, Unrealized Gains (Losses) on Investments Continuing Operations | 6,487 rdn_OtherComprehensiveIncomeLossNetofTaxUnrealizedGainsLossesonInvestmentsContinuingOperations |  | 2,665 rdn_OtherComprehensiveIncomeLossNetofTaxUnrealizedGainsLossesonInvestmentsContinuingOperations |
Accumulated Other Comprehensive Income, Net of Tax, ending balance | 59,674 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  |
Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Accumulated Other Comprehensive Income, before Tax, beginning balance | 79,208 us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | 57,345 us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Accumulated Other Comprehensive Income, Tax, beginning balance | 27,723 rdn_AccumulatedOtherComprehensiveIncomeTaxBenefit / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | 19,962 rdn_AccumulatedOtherComprehensiveIncomeTaxBenefit / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Accumulated Other Comprehensive Income, Net of Tax, beginning balance | 51,485 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | 37,383 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Other Comprehensive Income, before Tax [Abstract] |  |  |  |
Net foreign currency translation adjustments, before tax | (194)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  |  |
Unrealized holding (losses) gains arising during the period, before tax | 9,929 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | 2,670 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Less: Reclassification adjustment for net (losses) gains included in net income, before tax | (51)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember | [1] | 5 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember | [1]
Other Comprehensive Income (Loss), Before Tax, Unrealized Gains (Losses) on Investments Recorded as Assets Held for Sale | 2,812 rdn_OtherComprehensiveIncomeLossBeforeTaxUnrealizedGainsLossesonInvestmentsRecordedasAssetsHeldforSale / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | 1,175 rdn_OtherComprehensiveIncomeLossBeforeTaxUnrealizedGainsLossesonInvestmentsRecordedasAssetsHeldforSale / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Other comprehensive income, before tax | 12,598 us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | 3,840 us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Other Comprehensive Income, Tax [Abstract] |  |  |  |
Net foreign currency translation adjustments, tax | (68)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  |  |
Unrealized holding (losses) gains arising during the period, tax | 3,475 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | 1 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Less: Reclassification adjustment for net (losses) gains included in net income, tax | (18)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember | [1] | 1 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember | [1]
Other Comprehensive Income (Loss), Tax Effect, Unrealized Gains (Losses) on Investments Recorded as Assets Held for Sale | 984 rdn_OtherComprehensiveIncomeLossTaxEffectUnrealizedGainsLossesonInvestmentsRecordedasAssetsHeldforSale / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | (121)rdn_OtherComprehensiveIncomeLossTaxEffectUnrealizedGainsLossesonInvestmentsRecordedasAssetsHeldforSale / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Other Comprehensive Income, Tax | 4,409 us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | (121)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Other Comprehensive Income, Net of Tax [Abstract] |  |  |  |
Net foreign currency translation adjustments | (126)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  |  |
Unrealized holding gains arising during the period | 6,454 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | 2,669 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Less: Reclassification adjustment for net (losses) gains included in net income | (33)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember | [1] | 4 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember | [1]
Net unrealized gains on investments recorded as assets held for sale | 1,828 rdn_OtherComprehensiveIncomeLossNetofTaxUnrealizedGainsLossesonInvestmentsRecordedasAssetsHeldforSale / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | 1,296 rdn_OtherComprehensiveIncomeLossNetofTaxUnrealizedGainsLossesonInvestmentsRecordedasAssetsHeldforSale / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Other comprehensive income | 8,189 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | 3,961 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Other Comprehensive Income (Loss), Before Tax, Unrealized Gains Losses on Investments Continuing Operations | 9,980 rdn_OtherComprehensiveIncomeLossBeforeTaxUnrealizedGainsLossesonInvestmentsContinuingOperations / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | 2,665 rdn_OtherComprehensiveIncomeLossBeforeTaxUnrealizedGainsLossesonInvestmentsContinuingOperations / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Other Comprehensive Income (Loss), Tax Effect, Unrealized Gains (Losses) on Investments Continuing Operations | 3,493 rdn_OtherComprehensiveIncomeLossTaxEffectUnrealizedGainsLossesonInvestmentsContinuingOperations / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | 0 rdn_OtherComprehensiveIncomeLossTaxEffectUnrealizedGainsLossesonInvestmentsContinuingOperations / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Other Comprehensive Income (Loss), Net of Tax, Unrealized Gains (Losses) on Investments Continuing Operations | 6,487 rdn_OtherComprehensiveIncomeLossNetofTaxUnrealizedGainsLossesonInvestmentsContinuingOperations / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | 2,665 rdn_OtherComprehensiveIncomeLossNetofTaxUnrealizedGainsLossesonInvestmentsContinuingOperations / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Accumulated Other Comprehensive Income, before Tax, ending balance | 91,806 us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | 61,185 us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1 / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Accumulated Other Comprehensive Income, Tax, ending balance | 32,132 rdn_AccumulatedOtherComprehensiveIncomeTaxBenefit / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | 19,841 rdn_AccumulatedOtherComprehensiveIncomeTaxBenefit / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Accumulated Other Comprehensive Income, Net of Tax, ending balance | $ 59,674 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  | $ 41,344 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
[1] | Included in net gains on investments and other financial instruments on our condensed consolidated statements of operations.

X
- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References No definition available. + Details
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- Definition Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities related to continuing operations. Excludes assets held for sale and amounts related to other than temporary impairment (OTTI) loss. + References No definition available. + Details
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- Definition Amount before tax, of unrealized gains (losses) on investments that are recorded in assets held for sale as a result of discontinued operations + References No definition available. + Details
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- Definition Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities from continuing operations. Excludes assets held for sale and amounts related to other than temporary impairment (OTTI) loss. + References No definition available. + Details
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- Definition Amount after tax, of unrealized gains (losses) on investments that are recorded in assets held for sale as a result of discontinued operations. + References No definition available. + Details
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- Definition Amount before tax of increase (decrease) in accumulated in equity from transactions and other events and circumstances from non-owner sources. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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