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Note 16 - Commitments and Contingencies Contingent Claims for Trade Credit and Surety Primary Insurers (Details) (Trade Credit Reinsurance and Surety Insurance [Member], Financial Guaranty Segment, USD $) In Millions, unless otherwise specified	Jun. 30, 2014
Loss Contingencies [Line Items]
Percentage of Claims Rejected by Entity	100.00%
Euro Member Countries, Euro
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Minimum	$ 10.2
Loss Contingency, Range of Possible Loss, Maximum	17.0
United States of America, Dollars
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Minimum	13.9
Loss Contingency, Range of Possible Loss, Maximum	$ 23.1

X

- Definition

This concept represents the percentage of claims rejected by the entity as related to commitment and contingency disclosure for the reporting period.

+ References

No definition available.

+ Details

Name:	rdn_PercentageofClaimsRejectedbyEntity
Namespace Prefix:	rdn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The estimated maximum amount of possible loss from the contingency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

+ Details

Name:	us-gaap_LossContingencyRangeOfPossibleLossMaximum
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The estimated minimum amount of possible loss from the contingency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

+ Details

Name:	us-gaap_LossContingencyRangeOfPossibleLossMinimum
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant