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6. FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
FAIR VALUE MEASUREMENTS
Senior First Lien Term Loan	$ 415,325
Senior Second Lien Term Loan	180,000
Senior Secured Term Loan		349,125
Senior Notes	6,536	200,000
Level 1
FAIR VALUE MEASUREMENTS
Senior First Lien Term Loan
Senior Second Lien Term Loan
Senior Secured Term Loan
Senior Notes
Level 2
FAIR VALUE MEASUREMENTS
Senior First Lien Term Loan	413,768
Senior Second Lien Term Loan	179,100
Senior Secured Term Loan		380,508
Senior Notes	6,875	199,000
Level 3
FAIR VALUE MEASUREMENTS
Senior First Lien Term Loan
Senior Second Lien Term Loan
Senior Secured Term Loan
Senior Notes
Total Fair Value
FAIR VALUE MEASUREMENTS
Senior First Lien Term Loan	413,768
Senior Second Lien Term Loan	179,100
Senior Secured Term Loan		380,508
Senior Notes	$ 6,875	$ 199,000

X

- Definition

Senior First Lien Term Loan

+ References

No definition available.

+ Details

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

X

- 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

X

- Details

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

X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_ShorttermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant