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1. NOTES PAYABLE (Details - Term Loans) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
First Lien Term Loan  
Term loans face value $ 394,559us-gaap_DebtInstrumentFaceAmount
/ us-gaap_ShortTermDebtTypeAxis
= rdnt_FirstLienTermLoanMember
Term loans discount (8,681)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_ShortTermDebtTypeAxis
= rdnt_FirstLienTermLoanMember
Term loan carrying value 385,878us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_ShortTermDebtTypeAxis
= rdnt_FirstLienTermLoanMember
Second Lien Term Loans  
Term loans face value 180,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_ShortTermDebtTypeAxis
= rdnt_SecondLienTermLoanMember
Term loans discount (2,558)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_ShortTermDebtTypeAxis
= rdnt_SecondLienTermLoanMember
Term loan carrying value 177,442us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_ShortTermDebtTypeAxis
= rdnt_SecondLienTermLoanMember
Short-term Debt [Member]  
Term loans face value 574,559us-gaap_DebtInstrumentFaceAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember
Term loans discount (11,239)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember
Term loan carrying value $ 563,320us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember