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7. FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
FAIR VALUE MEASUREMENTS
Senior First Lien Term Loan	$ 410,133	$ 349,125
Senior Second Lien Term Loan	180,000	200,000
Total Fair Value
FAIR VALUE MEASUREMENTS
Senior First Lien Term Loan	412,697	380,508
Senior Second Lien Term Loan	180,450	199,000
Level 1
FAIR VALUE MEASUREMENTS
Senior First Lien Term Loan	0	0
Senior Second Lien Term Loan	0	0
Level 2
FAIR VALUE MEASUREMENTS
Senior First Lien Term Loan	412,697	380,508
Senior Second Lien Term Loan	180,450	199,000
Level 3
FAIR VALUE MEASUREMENTS
Senior First Lien Term Loan	0	0
Senior Second Lien Term Loan	$ 0	$ 0

X

- Definition

Senior First Lien Term Loan

+ References

No definition available.

+ Details

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Namespace Prefix:	rdnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Senior Second Lien Term Loan

+ References

No definition available.

+ Details

Name:	rdnt_SeniorSecondLienTermLoan
Namespace Prefix:	rdnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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