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5. GOODWILL AND OTHER INTANGIBLE ASSETS (Details - Annual Amortization Schedule) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Amortization next twelve months $ 2,968us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths
Amortization year 2016 2,594us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo
Amortization year 2017 2,506us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree
Amortization year 2018 2,463us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour
Amortization year 2019 2,379us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive
Amortization year thereafter 34,713us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingAfterYearFive
Amortiztion total 47,624us-gaap_AmortizationOfIntangibleAssets
Management Service Contracts  
Amortization next twelve months 2,315us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths
/ us-gaap_UnderlyingAssetClassAxis
= rdnt_ManagementServiceContractsMember
Amortization year 2016 2,315us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo
/ us-gaap_UnderlyingAssetClassAxis
= rdnt_ManagementServiceContractsMember
Amortization year 2017 2,315us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree
/ us-gaap_UnderlyingAssetClassAxis
= rdnt_ManagementServiceContractsMember
Amortization year 2018 2,315us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour
/ us-gaap_UnderlyingAssetClassAxis
= rdnt_ManagementServiceContractsMember
Amortization year 2019 2,315us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive
/ us-gaap_UnderlyingAssetClassAxis
= rdnt_ManagementServiceContractsMember
Amortization year thereafter 27,205us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingAfterYearFive
/ us-gaap_UnderlyingAssetClassAxis
= rdnt_ManagementServiceContractsMember
Amortiztion total 38,781us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_UnderlyingAssetClassAxis
= rdnt_ManagementServiceContractsMember
Weighted average amortization period remaining in years 169 months 18 days
Covenant Not To Compete  
Amortization next twelve months 320us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths
/ us-gaap_UnderlyingAssetClassAxis
= rdnt_CovenantNotToCompeteMember
Amortization year 2016 254us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo
/ us-gaap_UnderlyingAssetClassAxis
= rdnt_CovenantNotToCompeteMember
Amortization year 2017 191us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree
/ us-gaap_UnderlyingAssetClassAxis
= rdnt_CovenantNotToCompeteMember
Amortization year 2018 148us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour
/ us-gaap_UnderlyingAssetClassAxis
= rdnt_CovenantNotToCompeteMember
Amortization year 2019 64us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive
/ us-gaap_UnderlyingAssetClassAxis
= rdnt_CovenantNotToCompeteMember
Amortization year thereafter 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingAfterYearFive
/ us-gaap_UnderlyingAssetClassAxis
= rdnt_CovenantNotToCompeteMember
Amortiztion total 977us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_UnderlyingAssetClassAxis
= rdnt_CovenantNotToCompeteMember
Weighted average amortization period remaining in years 3 years 8 months 12 days
Customer Relationships  
Amortization next twelve months 184us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_CustomerRelationshipsMember
Amortization year 2016 1us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_CustomerRelationshipsMember
Amortization year 2017 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_CustomerRelationshipsMember
Amortization year 2018 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_CustomerRelationshipsMember
Amortization year 2019 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_CustomerRelationshipsMember
Amortization year thereafter 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingAfterYearFive
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_CustomerRelationshipsMember
Amortiztion total 185us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_CustomerRelationshipsMember
Weighted average amortization period remaining in years 10 months 24 days
Developed technology and in-process R and D  
Amortization next twelve months 149us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
Amortization year 2016 24us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
Amortization year 2017 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
Amortization year 2018 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
Amortization year 2019 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
Amortization year thereafter 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingAfterYearFive
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
Amortiztion total 173us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
Weighted average amortization period remaining in years 1 year 3 months 18 days
Trade Names  
Amortization year 2016 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_TradeNamesMember
Amortization year 2017 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_TradeNamesMember
Amortization year 2018 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_TradeNamesMember
Amortization year 2019 0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_TradeNamesMember
Amortization year thereafter 7,508us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingAfterYearFive
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_TradeNamesMember
Amortiztion total $ 7,508us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_TradeNamesMember