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Note 6 - Goodwill and Other Intangible Assets, Net Schedule of Goodwill (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
Goodwill [Line Items] |  |  |
Goodwill, net |  |  | $ 2,095 us-gaap_Goodwill
Goodwill, net | 194,246 us-gaap_Goodwill |  | 2,095 us-gaap_Goodwill
Mortgage and Real Estate Services Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Gross | 194,027 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | 2,095 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |
Goodwill, Impaired, Accumulated Impairment Loss | (2,095)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |
Goodwill, net | 191,932 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | 2,095 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | 2,095 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember
Goodwill, Acquired During Period | 2,314 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | 191,932 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |
Goodwill, Impairment Loss | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | (2,095)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |
Goodwill, Gross | 196,341 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | 194,027 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |
Goodwill, Impaired, Accumulated Impairment Loss | (2,095)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | (2,095)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |
Goodwill, net | 194,246 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | 191,932 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | 2,095 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember
Clayton Holdings, LLC [Member] | Series of Individually Immaterial Business Acquisitions [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Acquired During Period | $ 2,300 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember / dei_LegalEntityAxis = rdn_ClaytonHoldingsLLCMember |  |

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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X
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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