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Securities Lending Activity (Details)	9 Months Ended
	Sep. 30, 2017
Offsetting Liabilities [Line Items]
Securities Lending Rate of Collateral Required	1.02

X

- Definition

The rate of collateral required, expressed as a percentage of the fair value of the loaned securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	rdn_
Data Type:	xbrli:pureItemType
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_OffsettingLiabilitiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration