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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 |  |

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