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Note 7 - Reinsurance Reinsurance Transactions (Details) (Radian Guaranty [Member], USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2015 | Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2012 transaction
Reinsurance Transaction Details [Line Items] |  |  |  |  |
Number of Quota Share Reinsurance Agreements |  |  |  |  | 2 rdn_NumberofQuotaShareReinsuranceAgreements
Initial Quota Share Reinsurance Transaction [Member] |  |  |  |  |
Reinsurance Transaction Details [Line Items] |  |  |  |  |
First Lien Primary Mortgage Insurance Risk In Force Ceded |  | $ 1,100,000,000 rdn_FirstLienPrimaryMortgageInsuranceRiskInForceCeded / rdn_CapitalAndLiquidityAxis = rdn_InitialQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember |  |  |
Ceded Premiums Written |  | 4,067,000 us-gaap_CededPremiumsWritten / rdn_CapitalAndLiquidityAxis = rdn_InitialQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember | 5,304,000 us-gaap_CededPremiumsWritten / rdn_CapitalAndLiquidityAxis = rdn_InitialQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember |  |
Ceded Premiums Earned |  | 6,018,000 us-gaap_CededPremiumsEarned / rdn_CapitalAndLiquidityAxis = rdn_InitialQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember | 6,807,000 us-gaap_CededPremiumsEarned / rdn_CapitalAndLiquidityAxis = rdn_InitialQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember |  |
Fees and Commissions |  | 880,000 us-gaap_FeesAndCommissions / rdn_CapitalAndLiquidityAxis = rdn_InitialQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember | 1,326,000 us-gaap_FeesAndCommissions / rdn_CapitalAndLiquidityAxis = rdn_InitialQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember |  |
Ceded Insurance Commission Percentage |  | 20.00%rdn_CededInsuranceCommissionPercentage / rdn_CapitalAndLiquidityAxis = rdn_InitialQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember |  | 25.00%rdn_CededInsuranceCommissionPercentage / rdn_CapitalAndLiquidityAxis = rdn_InitialQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember |
Percentage of Ceded Insurance Subjected to Change in Commission Percentage | 66.67%rdn_PercentageofCededInsuranceSubjectedtoChangeinCommissionPercentage / rdn_CapitalAndLiquidityAxis = rdn_InitialQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember |  |  |  |
Second Quota Share Reinsurance Transaction [Member] |  |  |  |  |
Reinsurance Transaction Details [Line Items] |  |  |  |  |
First Lien Primary Mortgage Insurance Risk In Force Ceded |  | 1,500,000,000 rdn_FirstLienPrimaryMortgageInsuranceRiskInForceCeded / rdn_CapitalAndLiquidityAxis = rdn_SecondQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember |  |  |
Ceded Premiums Written |  | 6,529,000 us-gaap_CededPremiumsWritten / rdn_CapitalAndLiquidityAxis = rdn_SecondQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember | 7,293,000 us-gaap_CededPremiumsWritten / rdn_CapitalAndLiquidityAxis = rdn_SecondQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember |  |
Ceded Premiums Earned |  | 8,768,000 us-gaap_CededPremiumsEarned / rdn_CapitalAndLiquidityAxis = rdn_SecondQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember | 6,585,000 us-gaap_CededPremiumsEarned / rdn_CapitalAndLiquidityAxis = rdn_SecondQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember |  |
Fees and Commissions |  | 2,285,000 us-gaap_FeesAndCommissions / rdn_CapitalAndLiquidityAxis = rdn_SecondQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember | 2,553,000 us-gaap_FeesAndCommissions / rdn_CapitalAndLiquidityAxis = rdn_SecondQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember |  |
Maximum [Member] | Initial Quota Share Reinsurance Transaction [Member] |  |  |  |  |
Reinsurance Transaction Details [Line Items] |  |  |  |  |
First Lien Primary Mortgage Insurance Risk In Force Ceded |  | 1,600,000,000 rdn_FirstLienPrimaryMortgageInsuranceRiskInForceCeded / rdn_CapitalAndLiquidityAxis = rdn_InitialQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Maximum [Member] | Second Quota Share Reinsurance Transaction [Member] |  |  |  |  |
Reinsurance Transaction Details [Line Items] |  |  |  |  |
First Lien Primary Mortgage Insurance Risk In Force Ceded |  | $ 1,600,000,000 rdn_FirstLienPrimaryMortgageInsuranceRiskInForceCeded / rdn_CapitalAndLiquidityAxis = rdn_SecondQuotaShareReinsuranceTransactionMember / dei_LegalEntityAxis = rdn_RadianGuarantyMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |

X
- Definition Percentage of commissions due to ceded insurance. + References No definition available. + Details
Name: | rdn_CededInsuranceCommissionPercentage
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition First Lien Primary Mortgage Insurance Risk In Force Ceded + References No definition available. + Details
Name: | rdn_FirstLienPrimaryMortgageInsuranceRiskInForceCeded
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This concept represents the number of quota share reinsurance agreements the company has entered into with third party reinsurance providers. + References No definition available. + Details
Name: | rdn_NumberofQuotaShareReinsuranceAgreements
Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of the entity's ceded risk related to a quota share arrangement which was subjected to a change in ceding commission percentage. + References No definition available. + Details
Name: | rdn_PercentageofCededInsuranceSubjectedtoChangeinCommissionPercentage
Namespace Prefix: | rdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- 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
Name: | us-gaap_CededPremiumsEarned
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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
Name: | us-gaap_CededPremiumsWritten
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of fees and commissions from financial services and banking activities and correspondent clearing. Includes fees from depositor accounts, credit cards, merchant discounts, and fiduciary and trust activities, guarantee fees, investment advisory, management, and administrative fees, transfer agent fees, and insurance commissions. + References Reference 1: 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) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 9 + Details
Name: | us-gaap_FeesAndCommissions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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