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Document and Entity Information (USD $)
 12 Months Ended
Dec. 31, 2014
Mar. 10, 2015
Jun. 30, 2014
NonPlanOutstandingWarrantsMember      
Entity Registrant Name RadNet, Inc.    
Entity Central Index Key 0000790526    
Document Type 10-K    
Document Period End Date Dec. 31, 2014    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Is Entity a Well-known Seasoned Issuer No    
Is Entity a Voluntary Filer No    
Is Entity's Reporting Status Current Yes    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   43,654,575dei_EntityCommonStockSharesOutstanding  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2014    
Entity Public Float     $ 217,067,115dei_EntityPublicFloat