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Document and Entity Information (USD $)
 12 Months Ended
Dec. 31, 2013
Mar. 11, 2014
Jun. 28, 2013
NonPlanOutstandingWarrantsMember      
Entity Registrant Name RadNet, Inc.    
Entity Central Index Key 0000790526    
Document Type 10-K    
Document Period End Date Dec. 31, 2013    
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   41,100,981  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2013    
Entity Public Float     $ 87,669,201