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8. FAIR VALUE MEASUREMENTS (Details) (USD $) | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
FAIR VALUE MEASUREMENTS |  |
Interest Rate Swaps | $ 827,000 | $ 5,064,000
FairValueInputsLevel1Member |  |
FAIR VALUE MEASUREMENTS |  |
Interest Rate Swaps |  |
FairValueInputsLevel2Member |  |
FAIR VALUE MEASUREMENTS |  |
Interest Rate Swaps | 827,000 | 5,064,000
FairValueInputsLevel3Member |  |
FAIR VALUE MEASUREMENTS |  |
Interest Rate Swaps |  |

X
- Definition Custom Element. + References No definition available. + Details
Name: | rdnt_InterestRateSwaps
Namespace Prefix: | rdnt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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