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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