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Note 13 - Statutory Information Risk To Capital Calculation (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Risk to Capital Line Items [Line Items] |  |  |  |
Risk To Capital Ratio, Regulatory Maximum | 25 rdn_RiskToCapitalRatioRegulatoryMaximum |  |  |
Radian Guaranty [Member] |  |  |  |
Risk to Capital Line Items [Line Items] |  |  |  |
Percentage of New Insurance Written Attributable To States With Statutory Or Regulatory Risk Based Capital Requirements | 56.30%rdn_PercentageOfNewInsuranceWrittenAttributableToStatesWithStatutoryOrRegulatoryRiskBasedCapitalRequirements / dei_LegalEntityAxis = rdn_RadianGuarantyMember |  | 56.30%rdn_PercentageOfNewInsuranceWrittenAttributableToStatesWithStatutoryOrRegulatoryRiskBasedCapitalRequirements / dei_LegalEntityAxis = rdn_RadianGuarantyMember |
Risk In Force | $ 31,324.0 rdn_NetRiskInForce / dei_LegalEntityAxis = rdn_RadianGuarantyMember | [1] | $ 30,615.7 rdn_NetRiskInForce / dei_LegalEntityAxis = rdn_RadianGuarantyMember | [1]
Statutory capital | 1,349.4 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = rdn_RadianGuarantyMember |  | 1,325.2 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = rdn_RadianGuarantyMember |
Contingency reserve | 487.6 rdn_ContingencyReserve / dei_LegalEntityAxis = rdn_RadianGuarantyMember |  | 389.4 rdn_ContingencyReserve / dei_LegalEntityAxis = rdn_RadianGuarantyMember |
Statutory Accounting Practice, Statutory Position | 1,837.0 rdn_StatutoryAccountingPracticeStatutoryPosition / dei_LegalEntityAxis = rdn_RadianGuarantyMember |  | 1,714.6 rdn_StatutoryAccountingPracticeStatutoryPosition / dei_LegalEntityAxis = rdn_RadianGuarantyMember |
Risk-to-capital | 17.1 rdn_RiskToCapitalRatio / dei_LegalEntityAxis = rdn_RadianGuarantyMember |  | 17.9 rdn_RiskToCapitalRatio / dei_LegalEntityAxis = rdn_RadianGuarantyMember |
Mortgage Insurance Segment | State Insurance Regulations [Member] |  |  |  |
Risk to Capital Line Items [Line Items] |  |  |  |
Number Of States That Have A Statutory Or Regulatory Risk Based Capital Requirement | 16 rdn_NumberOfStatesThatHaveStatutoryOrRegulatoryRiskBasedCapitalRequirement / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = rdn_StateInsuranceRegulationsMember |  |  |
Minimum [Member] | Non RBC States [Member] |  |  |  |
Risk to Capital Line Items [Line Items] |  |  |  |
Capital Required for Capital Adequacy | 1 us-gaap_CapitalRequiredForCapitalAdequacy / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = rdn_NonRBCStatesMember |  |  |
Maximum [Member] | Non RBC States [Member] |  |  |  |
Risk to Capital Line Items [Line Items] |  |  |  |
Capital Required for Capital Adequacy | $ 5 us-gaap_CapitalRequiredForCapitalAdequacy / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = rdn_NonRBCStatesMember |  |  |
[1] | Excludes risk ceded through reinsurance contracts (to third parties and affiliates) and RIF on defaulted loans.

X
- Definition Funds separated from retained earnings and held to cover any unforeseen future business losses. + References No definition available. + Details
Name: | rdn_ContingencyReserve
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This concept represents the risk in force (an estimate of the maximum loss exposure that an entity has at any point in time) net of risk ceded through reinsurance contracts and net of risk in force on defaulted loans. + References No definition available. + Details
Name: | rdn_NetRiskInForce
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number Of States That Have A Statutory Or Regulatory Risk Based Capital Requirement + References No definition available. + Details
Name: | rdn_NumberOfStatesThatHaveStatutoryOrRegulatoryRiskBasedCapitalRequirement
Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This concept represents the percentage of new insurance written that is attributable to those states which have statutory or regulatory risk-based capital requirements. + References No definition available. + Details
Name: | rdn_PercentageOfNewInsuranceWrittenAttributableToStatesWithStatutoryOrRegulatoryRiskBasedCapitalRequirements
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | rdn_RiskToCapitalLineItemsLineItems
Namespace Prefix: | rdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This concept represents an entity's ratio of net risk in force (excludes risk ceded through reinsurance contracts and risk in force on defaulted loans) to the amount of statutory capital (defined as the sum of statutory policyholders' surplus plus statutory contingency reserves). + References No definition available. + Details
Name: | rdn_RiskToCapitalRatio
Namespace Prefix: | rdn_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition This concept represents the maximum ratio of net risk in force (net of risk ceded through reinsurance contracts and risk in force on defaulted loans) to statutory capital (defined as the sum of statutory policyholders' surplus plus statutory contingency reserves) allowed in those states which have statutory risk-based capital requirements. + References No definition available. + Details
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Namespace Prefix: | rdn_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition This concept represents statutory surplus plus contingency reserves, the total of which is used in the calculation of risk to capital. + References No definition available. + Details
Name: | rdn_StatutoryAccountingPracticeStatutoryPosition
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
Name: | us-gaap_CapitalRequiredForCapitalAdequacy
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.23(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph c -Article 7 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=rdn_RadianGuarantyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rdn_MortgageInsuranceSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |