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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Health Care Organization Revenue and Expense [Abstract]
Commercial Insurance/Managed Care Capitation	$ 37,384us-gaap_InsuranceRecoveries	$ 38,846us-gaap_InsuranceRecoveries	$ 40,220us-gaap_InsuranceRecoveries
Medicare	12,003us-gaap_HealthCareOrganizationPatientServiceRevenue	12,472us-gaap_HealthCareOrganizationPatientServiceRevenue	12,089us-gaap_HealthCareOrganizationPatientServiceRevenue
Medicaid	1,872us-gaap_HealthCareOrganizationPremiumRevenue	1,945us-gaap_HealthCareOrganizationPremiumRevenue	1,976us-gaap_HealthCareOrganizationPremiumRevenue
Workers Compensation/Personal Injury	2,643rdnt_WorkersCompensationpersonalInjury	2,746rdnt_WorkersCompensationpersonalInjury	2,615rdnt_WorkersCompensationpersonalInjury
Other	1,156us-gaap_HealthCareOrganizationOtherRevenue	1,201us-gaap_HealthCareOrganizationOtherRevenue	1,222us-gaap_HealthCareOrganizationOtherRevenue
Service fee revenue, net of contractual allowances and discounts	55,058us-gaap_HealthCareOrganizationRevenue	57,210us-gaap_HealthCareOrganizationRevenue	58,122us-gaap_HealthCareOrganizationRevenue
Provision for bad debts	2,832us-gaap_HealthCareOrganizationPatientServiceRevenueProvisionforBadDebts	2,777us-gaap_HealthCareOrganizationPatientServiceRevenueProvisionforBadDebts	2,752us-gaap_HealthCareOrganizationPatientServiceRevenueProvisionforBadDebts
Net service fee revenue	$ 52,226us-gaap_HealthCareOrganizationPatientServiceRevenueLessProvisionForBadDebts	$ 54,433us-gaap_HealthCareOrganizationPatientServiceRevenueLessProvisionForBadDebts	$ 55,370us-gaap_HealthCareOrganizationPatientServiceRevenueLessProvisionForBadDebts

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Workers comp arrangement

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Amount of revenue recognized that is not otherwise disclosed.

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Amount of revenue recognized for providing services to patients, net of provisions for contractual allowances and discounts.

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Amount of patient service revenue, net of contractual allowances and discounts, less the related provision for bad debts.

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Amount of the provision for bad debts related to patient service revenue.

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Amount of insurance premium revenue recognized.

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Amount of revenues recognized by the entity from providing services to in-patients, outpatients, residents in facilities owned or operated by the entity, from insurance premiums, or from goods provided or services performed.

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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