FACILITY ACQUISITIONS, ASSETS HELD FOR SALE AND DISPOSITIONS (Details Narrative) - USD ($)																					12 Months Ended
	Dec. 03, 2018	Nov. 05, 2018	Nov. 01, 2018	Oct. 01, 2018	Sep. 01, 2018	Apr. 01, 2018	Feb. 22, 2018	Jan. 01, 2018	Oct. 05, 2017	Oct. 01, 2017	Sep. 01, 2017	Aug. 07, 2017	Jul. 01, 2017	Jun. 01, 2017	May 03, 2017	Apr. 28, 2017	Apr. 01, 2017	Feb. 01, 2017	Jan. 13, 2017	Jan. 06, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill acquired																					$ 418,093,000	$ 256,776,000	$ 239,553,000
Fair value of investment																					30,030,000	45,935,000
Gain on step up valuation																					39,539,000	0	0
Common stock issued for acquisition																					8,000,000	2,500,000
Proceeds from sale of business																					0	8,429,000	0
Severance costs																					1,931,000	$ 1,821,000	$ 2,877,000
Advanced Imaging Partners, Inc.
Business Acquisition [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners													25.00%
Advanced Imaging at Timonium
Business Acquisition [Line Items]
Proceeds from sale of business													$ 3,900,000
Noncontrolling interest, ownership percentage by noncontrolling owners													25.00%
Transfer of fixed assets to new joint venture													$ 1,100,000
Proceeds in excess of book value													$ 2,800,000
Rhode Island Medical Imaging, Inc
Business Acquisition [Line Items]
Proceeds from sale of business																$ 4,500,000
Gain on sale of investment																$ 1,900,000
West Valley Imaging Center
Business Acquisition [Line Items]
Proceeds from sale of business																	$ 5,900,000
Transfer of fixed assets to new joint venture																	3,000,000			$ 3,000,000
Proceeds in excess of book value																	$ 1,800,000
West Valley Imaging Group, LLC
Business Acquisition [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners																	25.00%
Oncology practices
Business Acquisition [Line Items]
Proceeds from sale of business																	$ 1,200,000
Gain on sale of investment																	$ 361,000
Orange County Diagnostics Imaging Center
Business Acquisition [Line Items]
Consideration transferred	$ 6,600,000
Other current assets acquired	23,000
Other assets acquired	69,000
Fixed assets acquired	2,800,000
Goodwill acquired	3,600,000
Arcadia Radiology Imaging
Business Acquisition [Line Items]
Consideration transferred		$ 3,800,000
Other current assets acquired		20,000
Goodwill acquired		2,600,000
Equipment acquired		80,000
Southern California Diagnostic Imaging, Inc
Business Acquisition [Line Items]
Consideration transferred			$ 1,400,000
Other current assets acquired			18,000
Goodwill acquired			41,000
Equipment acquired			110,000
New Jersey Imaging Network, LLC
Business Acquisition [Line Items]
Other current assets acquired				$ 235,000
Fixed assets acquired				34,400,000
Goodwill acquired				106,100,000
Net working capital acquired				11,600,000
Unfavorable lease contracts acquired				1,000,000
Equipment debt assumed				5,200,000
Bank debt assumed				$ 60,000,000
Equity interest percentage				49.00%
Fair value of investment				$ 42,500,000
Adjustment of New Jersey Imaging Network investment balance				44,300,000
Gain on step up valuation				39,500,000
Medical Arts Radiology
Business Acquisition [Line Items]
Consideration transferred				59,600,000
Other current assets acquired				200,000
Fixed assets acquired				15,900,000
Goodwill acquired				41,500,000
Net working capital acquired				3,400,000
Unfavorable lease contracts acquired				130,000
Equipment debt assumed				2,700,000
Cash acquired from acquisition				50,900,000
Contingent consideration to guarantee share value issued				739,000
Payments to acquire business				50,900,000
Washington Heights Medical Management, LLC
Business Acquisition [Line Items]
Other current assets acquired					$ 43,000
Fixed assets acquired					904,000
Goodwill acquired					2,300,000
Payments to acquire business					3,300,000
Women's Imaging Specialists in Healthcare
Business Acquisition [Line Items]
Fixed assets acquired						$ 636,000
Goodwill acquired						4,300,000
Payments to acquire business						5,100,000
Valley Metabolic Imaging
Business Acquisition [Line Items]
Fixed assets acquired						22,000
Goodwill acquired						1,500,000
Payments to acquire business						1,700,000
Sierra Imaging Associates
Business Acquisition [Line Items]
Fixed assets acquired						270,000
Goodwill acquired						1,100,000
Payments to acquire business						1,500,000
Imaging Services Company of New York
Business Acquisition [Line Items]
Consideration transferred							$ 5,800,000
Fixed assets acquired							3,000,000
Goodwill acquired							2,700,000
Beach Imaging Group, LLC
Business Acquisition [Line Items]
Fixed assets acquired																					15,000,000
Capital lease assumed																					$ 4,000,000
Business acquisition, percentage of voting interests acquired								60.00%
RadSite, LLC
Business Acquisition [Line Items]
Fixed assets acquired									$ 25,000
Goodwill acquired									1,700,000
Payments to acquire business									856,000
Common stock issued for acquisition									1,000,000
Current assets acquired									91,000
Liabilities acquired									75,000
Remote Diagnostic Imaging P.L.L.C.
Business Acquisition [Line Items]
Consideration transferred										$ 3,900,000
Fixed assets acquired										2,600,000
Goodwill acquired										1,200,000
Diagnostic Imaging Associates
Business Acquisition [Line Items]
Fixed assets acquired												$ 3,100,000
Goodwill acquired												10,200,000
Payments to acquire business												13,000,000
Common stock issued for acquisition												1,500,000
Current assets acquired												$ 1,200,000
Stockton MRI, Inc
Business Acquisition [Line Items]
Consideration transferred														$ 4,400,000
Fixed assets acquired														1,200,000
Goodwill acquired														3,100,000
Intangible assets acquired														$ 50,000
D&D Diagnostics, Inc
Business Acquisition [Line Items]
Consideration transferred															$ 2,400,000
Other current assets acquired															16,000
Fixed assets acquired															820,000
Goodwill acquired															1,500,000
Payments to acquire business															1,200,000
Payoff of debt															$ 1,200,000
MRI Centers, Inc.
Business Acquisition [Line Items]
Consideration transferred																		$ 800,000
Other current assets acquired																		9,800
Fixed assets acquired																		289,000
Goodwill acquired																		401,000
Intangible assets acquired																		100,000
Payoff of debt																		$ 81,000
Resolution Imaging Medical Corp
Business Acquisition [Line Items]
Consideration transferred																			$ 4,000,000
Breastlink Medical
Business Acquisition [Line Items]
Proceeds from sale of business											$ 2,800,000
Gain on sale of investment											845,000
Severance costs											$ 1,200,000
Leasehold improvements | Arcadia Radiology Imaging
Business Acquisition [Line Items]
Fixed assets acquired		819,000
Leasehold improvements | Southern California Diagnostic Imaging, Inc
Business Acquisition [Line Items]
Fixed assets acquired			1,200,000
Noncompete Agreements | Orange County Diagnostics Imaging Center
Business Acquisition [Line Items]
Intangible assets acquired	$ 50,000
Noncompete Agreements | Arcadia Radiology Imaging
Business Acquisition [Line Items]
Intangible assets acquired		$ 300,000
Noncompete Agreements | Southern California Diagnostic Imaging, Inc
Business Acquisition [Line Items]
Intangible assets acquired			$ 50,000
Noncompete Agreements | Medical Arts Radiology
Business Acquisition [Line Items]
Intangible assets acquired				24,000
Noncompete Agreements | Washington Heights Medical Management, LLC
Business Acquisition [Line Items]
Intangible assets acquired					$ 50,000
Noncompete Agreements | Women's Imaging Specialists in Healthcare
Business Acquisition [Line Items]
Intangible assets acquired						143,000
Noncompete Agreements | Valley Metabolic Imaging
Business Acquisition [Line Items]
Intangible assets acquired						183,000
Noncompete Agreements | Sierra Imaging Associates
Business Acquisition [Line Items]
Intangible assets acquired						83,000
Noncompete Agreements | Imaging Services Company of New York
Business Acquisition [Line Items]
Intangible assets acquired							$ 100,000
Noncompete Agreements | RadSite, LLC
Business Acquisition [Line Items]
Intangible assets acquired									$ 150,000
Noncompete Agreements | Remote Diagnostic Imaging P.L.L.C.
Business Acquisition [Line Items]
Intangible assets acquired										$ 50,000
Trade Names | New Jersey Imaging Network, LLC
Business Acquisition [Line Items]
Intangible assets acquired				582,000
Trade Names | Medical Arts Radiology
Business Acquisition [Line Items]
Intangible assets acquired				$ 1,400,000
Trade Names | Women's Imaging Specialists in Healthcare
Business Acquisition [Line Items]
Intangible assets acquired						$ 53,000
Common Stock | Medical Arts Radiology
Business Acquisition [Line Items]
RadNet stock issued in acquisition (shares)				531,560
Value of RadNet stock issued in acquisition				$ 8,000,000
MemorialCare Medical Foundation | Beach Imaging Group, LLC
Business Acquisition [Line Items]
Fixed assets acquired								$ 7,600,000
Goodwill acquired								545,000
Equipment acquired								7,400,000
Payments to acquire business								22,300,000
Capital lease assumed								$ 4,000,000
Business acquisition, percentage of voting interests acquired								40.00%