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2. SUMMARY OF ACCOUNTING POLICIES (Details - Investment in Joint Ventures) (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
Equity Method Investments and Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning balance, as of January 1, 2014 |  |  |  | $ 28,949us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |  |  |  | $ 28,949us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |
Purchase of a 49% interest in a new joint venture |  |  |  |  |  |  |  |  | 2,168rdnt_PurchaseInterestJointVenture |  |
Equity contributions in existing joint ventures |  |  |  |  |  |  |  |  | 1,394rdnt_EquityContributionsJointVentures |  |
Equity earnings in these joint ventures | 2,248us-gaap_IncomeLossFromEquityMethodInvestments | 2,009us-gaap_IncomeLossFromEquityMethodInvestments | 1,646us-gaap_IncomeLossFromEquityMethodInvestments | 1,067us-gaap_IncomeLossFromEquityMethodInvestments | 1,713us-gaap_IncomeLossFromEquityMethodInvestments | 1,617us-gaap_IncomeLossFromEquityMethodInvestments | 1,658us-gaap_IncomeLossFromEquityMethodInvestments | 1,206us-gaap_IncomeLossFromEquityMethodInvestments | 6,970us-gaap_IncomeLossFromEquityMethodInvestments | 6,194us-gaap_IncomeLossFromEquityMethodInvestments | 6,476us-gaap_IncomeLossFromEquityMethodInvestments
Distribution of earnings |  |  |  |  |  |  |  |  | (7,358)us-gaap_EquityMethodInvestmentDividendsOrDistributions | (7,204)us-gaap_EquityMethodInvestmentDividendsOrDistributions | (6,477)us-gaap_EquityMethodInvestmentDividendsOrDistributions
Ending balance, as of December 31, 2014 | $ 32,123us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |  |  | $ 28,949us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |  |  | $ 32,123us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | $ 28,949us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |

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- Definition Equity contributions in existing joint ventures + References No definition available. + Details
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- Definition Purchase Interest in Joint Venture. + References No definition available. + Details
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- Definition This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Article 5 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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