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5. GOODWILL AND OTHER INTANGIBLE ASSETS (Details - Schedule of Goodwill) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill, beginning balance	$ 196,395us-gaap_Goodwill	$ 193,871us-gaap_Goodwill	$ 159,507us-gaap_Goodwill
Goodwill acquired through acquisitions
Adjustments to preliminary allocations of purchase price
Goodwill, ending balance	200,304us-gaap_Goodwill	196,395us-gaap_Goodwill	193,871us-gaap_Goodwill
Goodwill deductible for tax purposes	120,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
Camarillo Imaging
Goodwill acquired through acquisitions			86us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_CamarilloImagingMember
West Coast Radiology
Goodwill acquired through acquisitions			5,395us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_WestCoastRadiologyMember
Advanced Medical Imaging
Goodwill acquired through acquisitions			923us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_AdvancedMedicalImagingMember
Orthopedic Imaging
Goodwill acquired through acquisitions			302us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_OrthopedicImagingMember
Raven Holdings, U.S.
Adjustments to preliminary allocations of purchase price			7,895us-gaap_GoodwillOtherChanges / us-gaap_BusinessAcquisitionAxis = rdnt_RavenHoldingsMember
Upper Chesapeake Imaging
Goodwill acquired through acquisitions			1,849us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_UpperChesapeakeImagingMember
Vanowen Radiology
Goodwill acquired through acquisitions			386us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_VanowenRadiologyMember
Clinical Radiology
Goodwill acquired through acquisitions			1,838us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_ClinicalRadiologyMember
Lenox Hill Radiology
Goodwill acquired through acquisitions			15,690us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_LenoxHillRadiologyMember
Mission Viejo, CA
Goodwill acquired through acquisitions		185us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_MissionViejoMember
Lenox Hill Radiology
Adjustments to preliminary allocations of purchase price		(3,219)us-gaap_GoodwillOtherChanges / us-gaap_BusinessAcquisitionAxis = rdnt_LenoxHillMember
Park West
Goodwill acquired through acquisitions		2,047us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_ParkWestMember
Brooklyn, NY
Goodwill acquired through acquisitions		4,026us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_BrooklynMember
Northfield, NJ
Goodwill acquired through acquisitions		(1,000)us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_NorthfieldNewJerseyMember
South Valley Radiology Imaging LLC
Goodwill acquired through acquisitions		305us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_SouthValleyRadiologyMember
Corinthian
Goodwill acquired through acquisitions	310us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_CorinthianMember
Westchester Imaging
Goodwill acquired through acquisitions	231us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_WestchesterImagingMember
Garden State Radiology, LLC
Goodwill acquired through acquisitions	50us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_GardenStateMember
Medical Imaging of Manhattan
Goodwill acquired through acquisitions	1,433us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_MedicalImagingOfManhattanMember
Liberty Pacific Imaging Long Beach
Goodwill acquired through acquisitions	1,288us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_LibertyPacificImagingLongBeachMember
Moreno Valley Imaging
Goodwill acquired through acquisitions	362us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_MorenoValleyImagingMember
Hematology Oncology Consultants
Goodwill acquired through acquisitions	$ 235us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rdnt_HematologyOncologyConsultantsMember

X

- Definition

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Publisher FASB

-Name Accounting Standards Codification

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