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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Narrative)
 1 Months Ended 12 Months Ended
Apr. 12, 2018
USD ($)
Mar. 01, 2018
USD ($)
Feb. 01, 2018
USD ($)
shares
Apr. 01, 2017
USD ($)
Mar. 24, 2017
USD ($)
Jan. 06, 2017
USD ($)
Jun. 30, 2016
USD ($)
shares
Jan. 31, 2015
USD ($)
Dec. 31, 2018
USD ($)
joint_venture
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 01, 2018
USD ($)
Jan. 01, 2018
USD ($)
Jun. 08, 2017
shares
Property, Plant and Equipment [Line Items]                            
Factored accounts receivable                 $ 20,500,000          
Factoring expense                 440,000          
Factoring receivable                 18,600,000          
Meaningful use incentive income                 0 $ 250,000 $ 2,808,000      
Common stock returned from acquisition, shares | shares             958,536              
Gain on return of common stock             $ 5,000,000   0 0 5,032,000      
Deferred financing costs, net of accumulated amortization                 1,400,000 1,900,000        
Goodwill                 418,093,000 256,776,000 239,553,000      
Indefinite lived intangible assets                 9,772,000 7,900,000        
Loss on impairment                 3,937,000 0 0      
Goodwill impairment                 3,800,000          
Workers' compensation liability, current                 2,800,000 2,800,000        
Medical malpractice deductible per incidence                 10,000 10,000        
Contract loss accrual                 4,600,000 5,000,000        
Unfavorable contract liability                 2,200,000 1,400,000        
Common stock reserved for issuance | shares                           14,000,000
Total net assets                 $ 65,031,000 96,567,000        
Number of unconsolidated joint ventures | joint_venture                 14          
West Valley Imaging Center                            
Property, Plant and Equipment [Line Items]                            
Transfer of fixed assets to new joint venture       $ 3,000,000   $ 3,000,000                
Medic Vision                            
Property, Plant and Equipment [Line Items]                            
Equity interest percentage         12.50%       14.21%          
Investment at cost   $ 200,000     $ 1,000,000                  
Option to purchase additional equity method investment         $ 1,400,000                  
Ownership interest percentage acquired   1.96%                        
Initial ownership percentage after dilution   12.25%                        
Total net assets                 $ 1,200,000          
Turner Imaging Systems                            
Property, Plant and Equipment [Line Items]                            
Investment at cost     $ 2,000,000                      
Shares purchased | shares     2,100,000                      
Nulogix, Inc.                            
Property, Plant and Equipment [Line Items]                            
Equity interest percentage 25.00%                          
Investment at cost $ 2,000,000                          
Santa Monica Imaging Group                            
Property, Plant and Equipment [Line Items]                            
Funds contributed       $ 2,700,000                    
Santa Monica Imaging Group | RadNet                            
Property, Plant and Equipment [Line Items]                            
Equity interest percentage       40.00%                    
Funds contributed       $ 1,100,000                    
Santa Monica Imaging Group | Cedars Sinai Medical Center                            
Property, Plant and Equipment [Line Items]                            
Equity interest percentage       60.00%                    
Funds contributed       $ 1,600,000                    
ScriptSender LLC                            
Property, Plant and Equipment [Line Items]                            
Equity interest percentage           49.00%                
Carrying amount of investment                 2,500,000          
2016 Caps                            
Property, Plant and Equipment [Line Items]                            
Derivative liability                 $ 5,300,000          
2016 Caps | LIBOR                            
Property, Plant and Equipment [Line Items]                            
Basis spread on variable rate                 2.00%          
September 2020                            
Property, Plant and Equipment [Line Items]                            
Notional amounts                 $ 150,000,000          
October 2020                            
Property, Plant and Equipment [Line Items]                            
Notional amounts                 350,000,000          
Radiologix                            
Property, Plant and Equipment [Line Items]                            
Contract loss accrual                 8,900,000          
Santa Monica Imaging Group | RadNet                            
Property, Plant and Equipment [Line Items]                            
Consideration transfered       80,000                    
Transfer of fixed assets to new joint venture       2,500,000                    
Santa Monica Imaging Group | Cedars Sinai Medical Center                            
Property, Plant and Equipment [Line Items]                            
Consideration transfered       120,000                    
Transfer of fixed assets to new joint venture       $ 1,500,000                    
New Jersey Imaging Network, LLC                            
Property, Plant and Equipment [Line Items]                            
Goodwill                       $ 106,100,000    
Equity interest percentage                       49.00%    
Health Insurance                            
Property, Plant and Equipment [Line Items]                            
Self-insurance accrual                 $ 4,800,000 4,500,000        
Minimum                            
Property, Plant and Equipment [Line Items]                            
PP&E useful life                 3 years          
Minimum | Blue Shield                            
Property, Plant and Equipment [Line Items]                            
Stop loss policy claim amount                 $ 250,000          
Minimum | Dignity Health | Glendale Advanced Imaging | Joint Venture                            
Property, Plant and Equipment [Line Items]                            
Economic interest                 25.00%          
Minimum | Leasehold improvements                            
Property, Plant and Equipment [Line Items]                            
PP&E useful life                 3 years          
Maximum                            
Property, Plant and Equipment [Line Items]                            
PP&E useful life                 15 years          
Maximum | Blue Shield                            
Property, Plant and Equipment [Line Items]                            
Stop loss policy claim amount                 $ 1,000,000.0          
Maximum | Dignity Health | Glendale Advanced Imaging | Joint Venture                            
Property, Plant and Equipment [Line Items]                            
Economic interest                 55.00%          
Maximum | Leasehold improvements                            
Property, Plant and Equipment [Line Items]                            
PP&E useful life                 30 years          
4th and 5th Amendment to First Lien Credit Agreement                            
Property, Plant and Equipment [Line Items]                            
Deferred financing costs, net of accumulated amortization                   371,000        
Barclays                            
Property, Plant and Equipment [Line Items]                            
Total credit facilities outstanding                 $ 28,000,000          
Software developed for internal use                            
Property, Plant and Equipment [Line Items]                            
Useful life                 5 years          
Capitalized software costs, gross                 $ 6,400,000          
Monthly amortization expense               $ 107,000            
eRAD                            
Property, Plant and Equipment [Line Items]                            
Deferred revenue liability                 2,300,000          
Imaging On Call                            
Property, Plant and Equipment [Line Items]                            
Loss on impairment                 3,900,000          
Goodwill impairment                 3,800,000          
Write off of the reporting unit trade name                 100,000          
Net service fee revenue                            
Property, Plant and Equipment [Line Items]                            
Service fee revenue, net of contractual allowances and discounts                 868,741,000 810,623,000 776,200,000      
Net service fee revenue | eRAD                            
Property, Plant and Equipment [Line Items]                            
Service fee revenue, net of contractual allowances and discounts                 6,800,000 6,100,000 6,200,000      
License                            
Property, Plant and Equipment [Line Items]                            
Service fee revenue, net of contractual allowances and discounts                 248,000 492,000        
Investment Advisory, Management and Administrative Service [Member]                            
Property, Plant and Equipment [Line Items]                            
Service fee revenue, net of contractual allowances and discounts                 $ 13,800,000 $ 13,100,000 $ 11,900,000      
ASU 2014-09                            
Property, Plant and Equipment [Line Items]                            
Allowance for bad debts                         $ 34,600,000