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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