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Note 16 - Commitments and Contingencies Legal Proceedings (Details) (USD $) In Millions, unless otherwise specified |  | 0 Months Ended |  | 105 Months Ended | 9 Months Ended |
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Sep. 30, 2014 matters | Apr. 09, 2013 Real Estate Settlement Practices Act of 1974 [Member] | Sep. 30, 2014 Internal Revenue Service (IRS) [Member] | Sep. 30, 2014 Captive Reinsurance Arrangements [Member] | Sep. 30, 2014 Minimum [Member] plaintiff loan | Sep. 30, 2014 Total Primary Insurance Mortgage Insurance Products [Member] Maximum [Member] Insurance Claims [Member] | Sep. 30, 2014 Pool Insurance Mortgage Insurance Product [Member] Maximum [Member] Insurance Claims [Member] | Sep. 30, 2014 REMIC Residual [Member] Internal Revenue Service (IRS) [Member] | Sep. 30, 2014 Settled Litigation [Member] Loss Contingency 8-1-2011 Claim [Member] loan
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Litigation Settlement, Number of Home Mortgage Loans |  |  |  |  |  |  |  |  | 507
Risk In Force |  |  |  |  |  |  |  |  | $ 29.0
Litigation Settlement, Gross |  | 3.75 |  |  |  |  |  |  |
Number Of Home Mortgage Loans Involved In Pending Litigation |  |  |  |  | 1 |  |  |  |
Loss Contingency, Number of Plaintiffs Whose Loans Were Insured |  |  |  |  | 1 |  |  |  |
Minimum Number of Pending or Threatened Matters That Could Effect Our Results | 1 |  |  |  |  |  |  |  |
Loss Contingency, Settlement Agreement, Number of Years Restricted From Activities |  | 10 years |  |  |  |  |  |  |
Insurance Recoveries |  |  |  | 817 |  |  |  |  |
Income Tax Examination, Notice of Deficiency, Amounts Related to Unpaid Taxes and Penalties |  |  |  |  |  |  |  | 157 |
Income Tax Examination, Estimated Interest on Notice of Deficiency Amounts |  |  |  |  |  |  |  | 113 |
Income Tax Examination, Proposed State Liabilities Resulting from IRS Examination of Tax Years 2000 Through 2007 |  |  |  |  |  |  |  | 30 |
Income Tax Examination, Amount of Claimed Income Tax Refund Being Disallowed for Tax Years 2006 and 2007 |  |  | $ 105 |  |  |  |  |  |
Loss Contingency, Legal Actions Commencement, Period |  |  |  |  |  | 2 years | 3 years |  |

X
- Definition This concept represents an amount identified in a Notice of Deficiency from the IRS related to an income tax examination where the use of a NOL carryback is being denied. + References No definition available. + Details
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Balance Type: | na
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X
- Definition This concept represents the estimated interest on amounts assessed by the IRS on the Notice of Deficiency received as part of an income tax examination. + References No definition available. + Details
Name: | rdn_IncomeTaxExaminationEstimatedInterestonNoticeofDeficiencyAmounts
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition This concept represents the amount assessed by the IRS in the Notice of Deficiency related to unpaid taxes and penalties based on the outcome of an income tax examination. + References No definition available. + Details
Name: | rdn_IncomeTaxExaminationNoticeofDeficiencyAmountsRelatedtoUnpaidTaxesandPenalties
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- Definition The amount of estimated proposed state liabilities as of the balance sheet date arising from income tax examinations for tax years 2000 through 2007. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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X
- Definition The number of home mortgage loans included in the settlement agreement from litigation activity. + References No definition available. + Details
Name: | rdn_LitigationSettlementNumberofHomeMortgageLoans
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Under Our Master Insurance Policy Any Suit Or Action Arising From Any Right Of The Insured Under The Policy Must Be Commenced Within This Number Of Years After Such Right First Arose + References No definition available. + Details
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Data Type: | xbrli:durationItemType
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X
- Definition As part of a settlement agreement related to litigation, the number of years the defendant is restricted from conducting a specific activity. + References No definition available. + Details
Name: | rdn_LossContingencySettlementAgreementNumberOfYearsRestrictedFromActivities
Namespace Prefix: | rdn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition This concept represents the minimum number of currently pending or threatened matters that could potentially impact our results. + References No definition available. + Details
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- Definition Number Of Home Mortgage Loans Involved In Pending Litigation + References No definition available. + Details
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- Definition Risk In Force + References No definition available. + Details
Name: | rdn_RiskInForce
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Details
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X
- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References No definition available. + Details
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