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Note 7 - Reinsurance Reinsurance Premiums Written and Earned (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Premiums Earned, Net [Abstract] |  |
Net premiums earned-insurance | $ 224,595 us-gaap_PremiumsEarnedNet | $ 198,762 us-gaap_PremiumsEarnedNet
Mortgage Insurance Segment |  |
Premiums Written, Net [Abstract] |  |
Direct Premiums Written | 255,248 us-gaap_DirectPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember | 229,322 us-gaap_DirectPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember
Assumed Premiums Written | 47 us-gaap_AssumedPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember | 473 us-gaap_AssumedPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember
Ceded Premiums Written | (13,387)us-gaap_CededPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember | (16,089)us-gaap_CededPremiumsWritten / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember
Net premiums written | 241,908 us-gaap_PremiumsWrittenNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember | 213,706 us-gaap_PremiumsWrittenNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember
Premiums Earned, Net [Abstract] |  |
Direct Premiums Earned | 242,164 us-gaap_DirectPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember | 215,876 us-gaap_DirectPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember
Assumed Premiums Earned | 13 us-gaap_AssumedPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember | 12 us-gaap_AssumedPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember
Ceded Premiums Earned | (17,582)us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember | (17,126)us-gaap_CededPremiumsEarned / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember
Net premiums earned-insurance | $ 224,595 us-gaap_PremiumsEarnedNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember | $ 198,762 us-gaap_PremiumsEarnedNet / us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis = rdn_MortgageInsuranceSegmentMember

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- Definition Amount of earned premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 + Details
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- Definition Amount of written premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(2),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount of earned premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486662&loc=d3e27175-158546 + Details
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X
- Definition Amount of written premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(1) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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X
- Definition Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(1) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(c)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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