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Note 13 - Statutory Information Statutory Information (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Statutory Accounting Practices [Line Items] |  |
Restricted Net Assets Held by Consolidated Subsidiaries | $ 3,000,000,000 rdn_RestrictedNetAssetsHeldByConsolidatedSubsidiaries |
Radian Guaranty [Member] |  |
Statutory Accounting Practices [Line Items] |  |
Statutory Accounting Practices, Statutory Net Income Amount | 110,800,000 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = rdn_RadianGuarantyMember | 273,700,000 us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / dei_LegalEntityAxis = rdn_RadianGuarantyMember
Statutory capital | 1,349,400,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = rdn_RadianGuarantyMember | 1,325,200,000 us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / dei_LegalEntityAxis = rdn_RadianGuarantyMember
Statutory contingency reserve | $ 487,600,000 rdn_ContingencyReserve / dei_LegalEntityAxis = rdn_RadianGuarantyMember | $ 389,400,000 rdn_ContingencyReserve / dei_LegalEntityAxis = rdn_RadianGuarantyMember

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

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- Definition The amount of the entity's restricted net assets which are held by consolidated subsidiaries (entity's investment in subsidiaries). + References No definition available. + Details
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Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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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- Definition Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph c -Article 7 + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |