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8. NOTES PAYABLE, LINE OF CREDIT AND CAPITAL LEASES (Details - Schedule of debt) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Revolving lines of credit	$ 15,300us-gaap_LineOfCredit	$ 0us-gaap_LineOfCredit
Senior unsecured notes	0us-gaap_UnsecuredDebt	200,000us-gaap_UnsecuredDebt
Discounts on term loan and notes	(11,966)us-gaap_DebtInstrumentUnamortizedDiscount	(12,109)us-gaap_DebtInstrumentUnamortizedDiscount
Equipment notes payable	1,153us-gaap_LongTermLoansPayable	2,064us-gaap_LongTermLoansPayable
Obligations under capital leases	11,780us-gaap_CapitalLeaseObligations	5,854us-gaap_CapitalLeaseObligations
Total notes payable, line of credit and capital lease obligations	597,607us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	581,626us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
Less: current portion	(25,105)us-gaap_DebtCurrent	(6,178)us-gaap_DebtCurrent
Total notes payable, line of credit and capital lease obligations, long-term	572,502us-gaap_LongTermDebt	575,448us-gaap_LongTermDebt
Senior Secured Term Loan
Term loans	0us-gaap_TerminationLoans / us-gaap_ShortTermDebtTypeAxis = rdnt_SeniorSecuredTermLoanMember	385,325us-gaap_TerminationLoans / us-gaap_ShortTermDebtTypeAxis = rdnt_SeniorSecuredTermLoanMember
First Lien Term Loan
Term loans	399,750us-gaap_TerminationLoans / us-gaap_ShortTermDebtTypeAxis = rdnt_FirstLienTermLoanMember	0us-gaap_TerminationLoans / us-gaap_ShortTermDebtTypeAxis = rdnt_FirstLienTermLoanMember
Second Lien Term Loans
Term loans	180,000us-gaap_TerminationLoans / us-gaap_ShortTermDebtTypeAxis = rdnt_SecondLienTermLoanMember	0us-gaap_TerminationLoans / us-gaap_ShortTermDebtTypeAxis = rdnt_SecondLienTermLoanMember
Former Shareholders
Promissory notes payable	0us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = rdnt_FormerShareholdersMember	492us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = rdnt_FormerShareholdersMember
Healthcare Partners
Promissory notes payable	$ 1,590us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = rdnt_HealthcarePartnersMember	$ 0us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = rdnt_HealthcarePartnersMember

X

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt and capital lease obligations including current maturities.

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No definition available.

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Carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Definite liabilities to third parties under a termination loan agreement, whether or not guaranteed in whole or in part by the government.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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