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2. SUMMARY OF ACCOUNTING POLICIES (Details - Summary of net revenue) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Commercial Insurance									$ 418,414us-gaap_InsuranceCommissionsAndFees	$ 415,408us-gaap_InsuranceCommissionsAndFees	$ 409,114us-gaap_InsuranceCommissionsAndFees
Medicare									157,923rdnt_HealthCareOrganizationMedicare	156,066rdnt_HealthCareOrganizationMedicare	122,971rdnt_HealthCareOrganizationMedicare
Medicaid									24,248us-gaap_HealthCareOrganizationPremiumRevenue	24,017us-gaap_HealthCareOrganizationPremiumRevenue	20,101us-gaap_HealthCareOrganizationPremiumRevenue
Workers Compensation/Personal Injury									30,230rdnt_WorkersCompensationpersonalInjury	34,821rdnt_WorkersCompensationpersonalInjury	26,604rdnt_WorkersCompensationpersonalInjury
Other									39,321us-gaap_HealthCareOrganizationOtherRevenue	34,995us-gaap_HealthCareOrganizationOtherRevenue	39,192us-gaap_HealthCareOrganizationOtherRevenue
Service fee revenue, net of contractual allowances and discounts									670,136us-gaap_HealthCareOrganizationPatientServiceRevenue	665,307us-gaap_HealthCareOrganizationPatientServiceRevenue	617,982us-gaap_HealthCareOrganizationPatientServiceRevenue
Provision for bad debts									(29,807)us-gaap_HealthCareOrganizationPatientServiceRevenueProvisionforBadDebts	(27,911)us-gaap_HealthCareOrganizationPatientServiceRevenueProvisionforBadDebts	(25,904)us-gaap_HealthCareOrganizationPatientServiceRevenueProvisionforBadDebts
Net service fee revenue									640,329us-gaap_HealthCareOrganizationPatientServiceRevenueLessProvisionForBadDebts	637,396us-gaap_HealthCareOrganizationPatientServiceRevenueLessProvisionForBadDebts	592,078us-gaap_HealthCareOrganizationPatientServiceRevenueLessProvisionForBadDebts
Revenue under capitation arrangements									77,240us-gaap_HealthCareOrganizationCapitationRevenue	65,590us-gaap_HealthCareOrganizationCapitationRevenue	55,075us-gaap_HealthCareOrganizationCapitationRevenue
Total net revenue	$ 185,552us-gaap_SalesRevenueNet	$ 184,059us-gaap_SalesRevenueNet	$ 179,082us-gaap_SalesRevenueNet	$ 168,876us-gaap_SalesRevenueNet	$ 178,338us-gaap_SalesRevenueNet	$ 175,188us-gaap_SalesRevenueNet	$ 176,520us-gaap_SalesRevenueNet	$ 172,940us-gaap_SalesRevenueNet	$ 717,569us-gaap_SalesRevenueNet	$ 702,986us-gaap_SalesRevenueNet	$ 647,153us-gaap_SalesRevenueNet

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Medicare

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Workers Compensation/Personal Injury

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Amount of revenue recognized based on fees charged on a per capita basis.

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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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Income from agency and brokerage operations (includes sales of annuities and supplemental contracts); service charges, commissions, and fees from the sale of insurance and related services; and management fees from separate accounts, deferred annuities, and universal life products.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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