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ACQUISITIONS, DISPOSITIONS AND BUSINESS VENTURE ACTIVITY (Details - Narrative) - USD ($) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 01, 2021 | Jan. 01, 2021 | Jun. 01, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Aug. 31, 2021
Business Acquisition [Line Items] |  |  |  |  |  |  |
Common stock - par value (in dollars per share) |  |  |  | $ 0.0001 | $ 0.0001 |  |
Goodwill acquired |  |  |  | $ 513,820,000 | $ 472,879,000 | $ 441,973,000 |
Proceeds from sale of business |  |  |  | 0 | 0 | 132,000 |
Investment in joint ventures |  |  |  | 42,229,000 | 34,528,000 | 34,470,000 |
Contributions |  | $ 300,000 |  |  |  |  |
Sale to noncontrolling interests, net of taxes |  |  |  | 11,610,000 |  | 5,545,000 |
Purchase of intangible assets |  |  |  | 5,130,000 | $ 0 | 0 |
Additional Paid-in Capital |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Sale to noncontrolling interests, net of taxes | $ 4,200,000 |  |  | $ 4,206,000 |  | $ 3,537,000 |
Tarzana Medical Center, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase of intangible assets | $ 5,200,000 |  |  |  |  |  |
Sale | Imaging On Call |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Proceeds from sale of business |  |  | $ 1,000 |  |  |  |
DeepHealth, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Shares issued (in shares) |  |  | 915,132 |  |  |  |
Common stock - par value (in dollars per share) |  |  | $ 16.93 |  |  |  |
Shares issued at execution (in shares) |  |  | 823,615 |  |  |  |
Shares issued after execution (in shares) |  |  | 91,517 |  |  |  |
Shares issued after acquisition, term |  |  | 18 months |  |  |  |
Consideration transferred |  |  | $ 34,600,000 |  |  |  |
Fair value of shares issued at execution |  |  | 13,900,000 |  |  |  |
Fair value of shares issued after execution |  |  | 1,500,000 |  |  |  |
Fair value of replacement awards attributable to pre-combination |  |  | 2,000,000 |  |  |  |
Contingent consideration, fair value |  |  | 17,000,000 |  |  |  |
Business acquisition, closing costs |  |  | $ 100,000 |  |  |  |
Contingent consideration, milestone one, shares issued (in shares) |  |  | 390,789 |  |  |  |
Contingent consideration, milestone two, shares issued (in shares) |  |  | 586,184 |  |  |  |
Contingent consideration, milestone three, shares issued (in shares) |  |  | 195,393 |  |  |  |
Current assets acquired |  |  | $ 100,000 |  |  |  |
Deferred tax liabilities acquired |  |  | 3,500,000 |  |  |  |
Intangible assets acquired |  |  | 14,800,000 |  |  |  |
Goodwill acquired |  |  | $ 23,300,000 |  |  |  |
Simi Valley Imaging Group, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Investment in joint ventures |  | 400,000 |  |  |  |  |
Simi Adventist |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Investment in joint ventures |  | $ 100,000 |  |  |  |  |
Simi Valley Imaging Group, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Economic interest |  | 60.00% |  |  |  |  |
Simi Valley Imaging Group, LLC | Simi Adventist |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Economic interest |  | 40.00% |  |  |  |  |
West Valley Imaging Group, LLC | Subsidiaries |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Noncontrolling interest, percent of ownership sold | 24.90% |  |  |  |  |  |
Proceeds from sale of interest in minority shareholders | $ 13,100,000 |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 50.10% |  |  |  |  |  | 75.00%

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