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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
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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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- Definition Amount of revenue recognized based on fees charged on a per capita basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 605 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35755891&loc=d3e8200-115640 + Details
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- Definition Amount of revenue recognized that is not otherwise disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of revenue recognized for providing services to patients, net of provisions for contractual allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 605 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35755891&loc=SL9156442-115640 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755891&loc=d3e8184-115640 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 605 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35755891&loc=d3e8195-115640 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 605 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35755915&loc=SL9156464-115641 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 605 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35755891&loc=SL9156442-115640 + Details
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- Definition Amount of patient service revenue, net of contractual allowances and discounts, less the related provision for bad debts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 605 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35755891&loc=SL9156442-115640 + Details
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- Definition Amount of insurance premium revenue recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(c),(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph c, d -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 4 -Article 7 + Details
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