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Note 5 - VIEs NIMS VIEs (Details) (NIMS VIEs [Member], Variable Interest Entity, Primary Beneficiary [Member])	Jun. 30, 2014 bond
NIMS VIEs [Member] | Variable Interest Entity, Primary Beneficiary [Member]
NIMS VIEs [Abstract]
Number of Remaining NIMS Transactions	1

X

- Details

Name:	rdn_NimsViesAbstract
Namespace Prefix:	rdn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This concept represents the number of net interest margin (NIM) bonds.

+ References

No definition available.

+ Details

Name:	rdn_NumberOfNIMSBonds
Namespace Prefix:	rdn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant