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Note 7 - Goodwill and Other Intangible Assets, Net Schedule of Acquired Finite-Lived Intangible Assets (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items] |
Acquired Finite-Lived Assets, Tax Deductible Amount | $ 102.9
Finite-Lived Intangible Assets, Remaining Amortization Period | 15 years
Trademarks [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 10 years
Minimum [Member] | Customer Relationships [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 10 years
Minimum [Member] | Computer Software, Intangible Asset [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 3 years
Minimum [Member] | Order or Production Backlog [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 3 years
Minimum [Member] | Noncompete Agreements [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 18 months
Maximum [Member] | Customer Relationships [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 15 years
Maximum [Member] | Computer Software, Intangible Asset [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 6 years
Maximum [Member] | Order or Production Backlog [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 5 years
Maximum [Member] | Noncompete Agreements [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 3 years

X
- Definition This concept represents the amount of finite-lived intangible assets acquired that are considered eligible for tax deduction. + References No definition available. + Details
Name: | rdn_AcquiredFiniteLivedAssetsTaxDeductibleAmount
Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration