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Note 8 - Reinsurance Reinsurance Transactions (Details) (Radian Guaranty [Member], USD $) |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |
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Sep. 30, 2014 transaction | Sep. 30, 2014 Initial Quota Share Reinsurance Transaction [Member] | Sep. 30, 2013 Initial Quota Share Reinsurance Transaction [Member] | Sep. 30, 2014 Initial Quota Share Reinsurance Transaction [Member] | Sep. 30, 2013 Initial Quota Share Reinsurance Transaction [Member] | Sep. 30, 2014 Second Quota Share Reinsurance Transaction [Member] | Sep. 30, 2013 Second Quota Share Reinsurance Transaction [Member] | Sep. 30, 2014 Second Quota Share Reinsurance Transaction [Member] | Sep. 30, 2013 Second Quota Share Reinsurance Transaction [Member] | Sep. 30, 2014 Maximum [Member] Initial Quota Share Reinsurance Transaction [Member] | Dec. 31, 2014 Scenario, Forecast [Member] Initial Quota Share Reinsurance Transaction [Member]
Reinsurance Transaction Details [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Quota Share Reinsurance Agreements | 2 |  |  |  |  |  |  |  |  |  |
First Lien Primary Mortgage Insurance Risk In Force Ceded |  | $ 1,200,000,000 |  | $ 1,200,000,000 |  | $ 1,500,000,000 |  | $ 1,500,000,000 |  | $ 1,600,000,000 |
Ceded Premiums Written |  | 4,668,000 | 5,551,000 | 15,018,000 | 17,573,000 | 9,082,000 | 8,233,000 | 24,447,000 | 32,253,000 |  |
Ceded Premiums Earned |  | 6,578,000 | 7,216,000 | 20,188,000 | 22,711,000 | 7,699,000 | 5,099,000 | 21,481,000 | 12,220,000 |  |
Fees and Commissions |  | 1,166,000 | 1,388,000 | 3,754,000 | 4,393,000 | 3,179,000 | 2,882,000 | 8,557,000 | 11,289,000 |  |
Ceded Risk, Amount Able to Be Recaptured Under Quota Share Transaction |  |  |  |  |  |  |  |  |  |  | $ 750,000,000

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- Definition The amount of previously ceded risk under quota share agreements that is able to be recaptured at a later date. + References No definition available. + Details
Name: | rdn_CededRiskAmountAbletoBeRecapturedUnderQuotaShareTransaction
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition First Lien Primary Mortgage Insurance Risk In Force Ceded + 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 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

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

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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
Name: | us-gaap_CededPremiumsEarned
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Balance Type: | debit
Period Type: | duration

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