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Note 5 - Variable Interest Entities NIMS VIEs (Details) (NIMS VIEs [Member], Variable Interest Entity, Primary Beneficiary [Member]) | Sep. 30, 2014 bond
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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