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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     $ 2,095us-gaap_Goodwill
Goodwill, net 194,246us-gaap_Goodwill   2,095us-gaap_Goodwill
Mortgage and Real Estate Services Segment [Member]      
Goodwill [Line Items]      
Goodwill, Gross 194,027us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
2,095us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
 
Goodwill, Impaired, Accumulated Impairment Loss (2,095)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
 
Goodwill, net 191,932us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
2,095us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
2,095us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
Goodwill, Acquired During Period 2,314us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
191,932us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
 
Goodwill, Impairment Loss 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
(2,095)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
 
Goodwill, Gross 196,341us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
194,027us-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 194,246us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
191,932us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= rdn_MortgageandRealEstateServicesSegmentMember
2,095us-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 $ 2,300us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
/ dei_LegalEntityAxis
= rdn_ClaytonHoldingsLLCMember