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Note 17 - Commitments and Contingencies Legal Proceedings (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2015 USD ($) plaintiff matters loan
Loss Reserve Information [Abstract] |  |
Minimum Number of Pending or Threatened Matters That Could Effect Our Results | matters |  | 1
Settlement Agreement, Number of Years Entity Has Agreed Not to Enter Into Captive Insurance Arrangements | 10 years |
Internal Revenue Service (IRS) [Member] |  |
Loss Reserve Information [Abstract] |  |
Income Tax Examination, Amount of Claimed Income Tax Refund Being Disallowed for Tax Years 2006 and 2007 |  | $ 105
Minimum [Member] |  |
Loss Contingencies [Line Items] |  |
Number Of Home Mortgage Loans Involved In Pending Litigation | loan |  | 1
Loss Reserve Information [Abstract] |  |
Loss Contingency, Number of Plaintiffs | plaintiff |  | 1
REMIC Residual [Member] | Internal Revenue Service (IRS) [Member] |  |
Loss Contingencies [Line Items] |  |
Income Tax Examination, Notice of Deficiency, Amounts Related to Unpaid Taxes and Penalties |  | $ 157
Loss Reserve Information [Abstract] |  |
Income Tax Examination, Estimated Interest on Notice of Deficiency Amounts |  | 125
Income Tax Examination, Proposed State Liabilities Resulting from IRS Examination of Tax Years 2000 Through 2007 |  | $ 32
Insurance Claims [Member] | Maximum [Member] | Total Primary Insurance Mortgage Insurance Products [Member] |  |
Loss Reserve Information [Abstract] |  |
Loss Contingency, Legal Actions Commencement, Period |  | 2 years
Insurance Claims [Member] | Maximum [Member] | Pool Insurance Mortgage Insurance Product [Member] |  |
Loss Reserve Information [Abstract] |  |
Loss Contingency, Legal Actions Commencement, Period |  | 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
Name: | rdn_IncomeTaxExaminationAmountofClaimedIncomeTaxRefundBeingDisallowedforTaxYears2006and2007
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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: | credit
Period Type: | instant

X
- Definition The amount of estimated state tax liabilities as of the balance sheet date arising from IRS examinations for tax years 2000 through 2007. + References No definition available. + Details
Name: | rdn_IncomeTaxExaminationEstimatedStateTaxLiabilitiesResultingfromIRSExaminationofTaxYears2000Through2007
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
Namespace Prefix: | rdn_
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Balance Type: | credit
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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Balance Type: | na
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X
- Definition Loss Reserve Information [Abstract] + References No definition available. + Details
Name: | rdn_LossReserveInformationAbstract
Namespace Prefix: | rdn_
Data Type: | xbrli:stringItemType
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
Name: | rdn_MinimumNumberofPendingorThreatenedMattersThatCouldEffectOurResults
Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Home Mortgage Loans Involved In Pending Litigation + References No definition available. + Details
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Namespace Prefix: | rdn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of years the entity has agreed to not enter into captive insurance arrangements as part of a consent order. + References No definition available. + Details
Name: | rdn_SettlementAgreementNumberofYearsEntityHasAgreedNottoEnterIntoCaptiveInsuranceArrangements
Namespace Prefix: | rdn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

X
- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Period Type: |

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- Details
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Data Type: | na
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |