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FACILITY ACQUISITIONS, ASSETS HELD FOR SALE AND DISPOSITIONS (Details - Narrative) |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
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Aug. 31, 2020 USD ($) Center | Jun. 01, 2020 USD ($) $ / shares shares | Mar. 02, 2020 USD ($) | Jan. 02, 2020 USD ($) | Aug. 01, 2019 USD ($) Center | Apr. 01, 2019 USD ($) Center | Mar. 01, 2019 USD ($) Center | Feb. 28, 2019 USD ($) | Feb. 01, 2019 USD ($) | Jan. 01, 2019 USD ($) | Apr. 12, 2018 USD ($) | Nov. 06, 2014 USD ($) | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) | Nov. 01, 2020 | Jul. 31, 2019 | Jan. 01, 2018 USD ($) | Apr. 01, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000.0 |
Goodwill acquired |  |  |  |  |  |  |  |  |  |  |  |  | $ 472,879,000 | $ 441,973,000 | $ 418,093,000 |  |  |  |
Common stock - par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  |  |  |  |
Sale of ownership interest |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (134,000) |  |  |  |  |
Proceeds from sale of business |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 132,000 | $ 0 |  |  |  |
AZ Tech |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | Center | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred | $ 5,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets acquired | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets acquired | 7,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets acquired | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease liabilities acquired | 7,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired | $ 2,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MRI at Woodbridge, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  | $ 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets acquired |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets acquired |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease liabilities acquired |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  | 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance lease liabilities acquired |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Olney Open MRI, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  | $ 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets acquired |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets acquired |  |  |  | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease liabilities acquired |  |  |  | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Imaging On Call |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  | $ 1,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DeepHealth, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  | 34,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  | $ 23,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  | 915,132 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock - par value (in dollars per share) | $ / shares |  | $ 16.93 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued after execution (in shares) | shares |  | 91,517 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued after acquisition, term |  | 18 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of shares issued after execution |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of replacement awards attributable to pre-combination |  | 2,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration, fair value |  | 17,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, closing costs |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration, milestone one, shares issued (in shares) | shares |  | 390,789 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration, milestone two, shares issued (in shares) | shares |  | 586,184 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration, milestone three, shares issued (in shares) | shares |  | 195,393 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets acquired |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities acquired |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  | $ 14,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Garden State Radiology Network LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | Center |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets acquired |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets acquired |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets acquired |  |  |  |  | 1,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease liabilities acquired |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  | $ 2,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest percentage |  |  |  |  | 51.00% |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |
Sale of ownership interest |  |  |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets assumed |  |  |  |  | 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  |  |  |  |  |  |  |  |  | $ 2,200,000 |  |  |  |  |  |  |
Nulogix, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets acquired |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities acquired |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest percentage |  |  |  |  | 75.00% |  |  |  |  |  | 25.00% |  |  |  |  |  | 25.00% |  |
Sale of ownership interest |  |  |  |  | $ (500,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  |  | $ 1,500,000 |  |  |  |  |  | $ 2,000,000.0 |  |  |  |  |  |  |  |
Kern Radiology Imaging Systems Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | Center |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | $ 19,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets acquired |  |  |  |  |  | 10,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets acquired |  |  |  |  |  | 9,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease liabilities acquired |  |  |  |  |  | 14,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  | 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  | 3,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets acquired |  |  |  |  |  | $ 36,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Zilkha Radiology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | Center |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | $ 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets acquired |  |  |  |  |  | 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets acquired |  |  |  |  |  | 5,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease liabilities acquired |  |  |  |  |  | 5,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  | 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Finance lease liabilities acquired |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Hudson Valley Radiology Associates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  |  |  | 3,100,000 |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |
Value of RadNet stock issued in acquisition |  |  |  |  |  |  |  | 6,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Equipment acquired |  |  |  |  |  |  |  | 10,000.0 |  |  |  |  |  |  |  |  |  |  |
West Valley Imaging Group, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  | $ 3,000,000.0 |  |  |  |  |  |  |  |  |  |
Fixed assets acquired |  |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  |  |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |
Other assets acquired |  |  |  |  |  |  |  |  | 7,000.0 |  |  |  |  |  |  |  |  |  |
Ventura County Imaging Group, LLC. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest percentage |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  |  |  |  | $ 10,400,000 |  |  |  |  |  |  |  |  |  |  |  |
DeepHealth Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued at execution (in shares) | shares |  | 823,615 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of shares issued at execution |  | $ 13,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dignity Health. | Ventura County Imaging Group, LLC. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | Center |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets acquired |  |  |  |  |  |  | $ 4,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Equity interest percentage |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  |  |  |  | $ 6,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments, Assets |  |  |  |  |  |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |
Equity interest percentage in exchange for assets |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments, cash |  |  |  |  |  |  | $ 5,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Equity interest percentage in exchange for cash |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |
Noncompete Agreements | Hudson Valley Radiology Associates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  | 50,000.0 |  |  |  |  |  |  |  |  |  |  |
Trade Names | Hudson Valley Radiology Associates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |
Primedex Health Systems Inc. and Radiologix | Hudson Valley Radiology Associates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unfavorable lease contracts acquired |  |  |  |  |  |  |  | $ 2,800,000 |  |  |  |  |  |  |  |  |  |  |
West Valley Imaging Group, LLC | West Valley Imaging Group, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  |  |  |  |  |  | $ 800,000 |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Arizona Diagnostic Radiology Group LLC | RadNet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |
Arizona Diagnostic Radiology Group LLC | CHI National Services Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00% |  |  |
Santa Monica Imaging Group | RadNet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest percentage |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  | 40.00%
Sale of ownership interest |  |  |  |  |  |  |  |  |  | $ (2,000) |  |  |  |  |  |  |  |  |

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