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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

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- 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

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