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BUSINESS COMBINATIONS AND RELATED ACTIVITY (Details - Narrative) |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2022 USD ($) $ / shares shares | Jun. 15, 2022 USD ($) location | Apr. 01, 2022 USD ($) center location | Jan. 20, 2022 USD ($) $ / shares shares | Sep. 01, 2021 USD ($) | Jan. 01, 2021 USD ($) | Dec. 31, 2022 USD ($) location | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Aug. 31, 2021
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 677,665,000 | $ 513,820,000 | $ 472,879,000 |
Property and equipment, net |  |  |  |  |  |  | 565,961,000 | 484,247,000 |  |
Gain (loss) on disposition of property plant equipment |  |  |  |  |  |  | (2,529,000) | (8,319,000) | (1,200,000) |
Payments to acquire additional interest in subsidiaries |  |  |  |  |  |  | 1,441,000 | 1,441,000 | 1,635,000 |
Investment in joint ventures |  |  |  |  |  |  | 57,893,000 | 42,229,000 | 34,528,000 |
Contributions |  |  |  |  |  | $ 300,000 |  |  |  |
Sale to noncontrolling interests, net of taxes |  |  |  |  |  |  | 6,623,000 | 11,610,000 |  |
Purchase of intangible assets |  |  |  |  |  |  | 0 | 5,130,000 | $ 0 |
Tarzana Medical Center, LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of intangible assets |  |  |  |  | $ 5,200,000 |  |  |  |  |
Additional Paid-in Capital |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Sale to noncontrolling interests, net of taxes |  |  |  |  | $ 4,200,000 |  | $ 6,623,000 | 4,206,000 |  |
Frederick County Radiology, LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of centers contributed | center |  |  | 4 |  |  |  |  |  |  |
Frederick Health Hospital, Inc. | Frederick County Radiology, LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of investment |  |  | $ 11,100,000 |  |  |  |  |  |  |
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 |  |  |  |
Frederick County Radiology, LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of location | location |  |  | 6 |  |  |  |  |  |  |
Frederick County Radiology, LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Economic interest |  |  | 65.00% |  |  |  |  |  |  |
Frederick County Radiology, LLC | Additional Paid-in Capital |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of property plant equipment |  |  | $ 6,600,000 |  |  |  |  |  |  |
Frederick County Radiology, LLC | Frederick Health Hospital, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 11,000,000 |  |  |  |  |  |  |
Property and equipment, net |  |  | $ 8,400,000 |  |  |  |  |  |  |
Minority partner ownership percent |  |  | 35.00% |  |  |  |  |  |  |
Frederick County Radiology, LLC | Fixed Assets | Frederick Health Hospital, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Property and equipment, net |  |  | $ 5,400,000 |  |  |  |  |  |  |
Frederick County Radiology, LLC | Medical equipment | Frederick Health Hospital, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Property and equipment, net |  |  | $ 3,000,000 |  |  |  |  |  |  |
Advanced Radiology at Capital Region, LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of location | location |  | 2 |  |  |  |  |  |  |  |
Economic interest |  | 51.00% |  |  |  |  |  |  |  |
Payments to acquire additional interest in subsidiaries |  | $ 5,100 |  |  |  |  |  |  |  |
Advanced Radiology at Capital Region, LLC | Dimension Health Corporation |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Economic interest |  | 49.00% |  |  |  |  |  |  |  |
Total net assets |  | $ 4,900 |  |  |  |  |  |  |  |
Simi Valley Imaging Group, LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Economic interest |  |  |  |  |  | 60.00% |  |  |  |
Number of locations | location |  |  |  |  |  |  | 2 |  |  |
Contributions |  |  |  |  |  | $ 300,000 |  |  |  |
Simi Valley Imaging Group, LLC | Simi Valley Imaging Group, LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Investment in joint ventures |  |  |  |  |  | $ 400,000 |  |  |  |
Simi Valley Imaging Group, LLC | Simi Adventist |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Economic interest |  |  |  |  |  | 40.00% |  |  |  |
Investment in joint ventures |  |  |  |  |  | $ 100,000 |  |  |  |
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%
Software developed for internal use |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  | 7 years |  |  |
Customer Relationships |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  | 3 years |  |  |
Trade Names |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  | 7 years |  |  |
Measurement Input, Discount Rate | Valuation, Income Approach | Minimum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration liability, measurement input |  |  |  |  |  |  | 0.15 |  |  |
Measurement Input, Discount Rate | Valuation, Income Approach | Maximum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration liability, measurement input |  |  |  |  |  |  | 0.17 |  |  |
Heart and Lung Imaging Limited |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired | 75.00% |  |  |  |  |  |  |  |  |
Consideration transferred | $ 31,900,000 |  |  |  |  |  |  |  |  |
Common stock issued as consideration | $ 6,800,000 |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares | 359,002 |  |  |  |  |  |  |  |  |
Price per share (dollars per share) | $ / shares | $ 19.06 |  |  |  |  |  |  |  |  |
Consideration transferred | $ 6,300,000 |  |  |  |  |  |  |  |  |
Contingent consideration to guarantee share value issued | $ 10,800,000 |  |  |  |  |  | $ 11,656,000 | 0 |  |
Business combination, contingent consideration, liability, period | 24 months |  |  |  |  |  |  |  |  |
Business combination, noncontrolling interest | $ 8,000,000 |  |  |  |  |  |  |  |  |
Current assets acquired | 600,000 |  |  |  |  |  |  |  |  |
Intangible assets | 15,800,000 |  |  |  |  |  |  |  |  |
Liabilities | 600,000 |  |  |  |  |  |  |  |  |
Goodwill | 16,200,000 |  |  |  |  |  |  |  |  |
Property and equipment | $ 0 |  |  |  |  |  |  |  |  |
Heart and Lung Imaging Limited | Measurement Input, Discount Rate | Valuation, Income Approach |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration liability, measurement input | 0.190 |  |  |  |  |  |  |  |  |
Heart and Lung Imaging Limited | Contingent Milestone Consideration |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration to guarantee share value issued | $ 10,200,000 |  |  |  |  |  | 11,100,000 |  |  |
Heart and Lung Imaging Limited | Cash Holdback |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration to guarantee share value issued | $ 600,000 |  |  |  |  |  |  |  |  |
Aidence |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  | $ 45,200,000 |  |  |  |  |  |
Shares issued (in shares) | shares | 359,002 |  |  | 1,141,234 |  |  |  |  |  |
Consideration transferred |  |  |  | $ 1,800,000 |  |  |  |  |  |
Contingent consideration to guarantee share value issued |  |  |  | 11,900,000 |  |  | $ 11,158,000 | 0 |  |
Current assets acquired |  |  |  | 1,000,000 |  |  |  |  |  |
Liabilities |  |  |  | 3,200,000 |  |  |  |  |  |
Goodwill |  |  |  | 22,900,000 |  |  |  |  |  |
Settlement of loan |  |  |  | 1,500,000 |  |  |  |  |  |
Property and equipment |  |  |  | 200,000 |  |  |  |  |  |
Intangible assets acquired |  |  |  | 27,700,000 |  |  |  |  |  |
Deferred tax liabilities acquired |  |  |  | 3,500,000 |  |  |  |  |  |
Aidence | Software developed for internal use |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | 21,100,000 |  |  |  |  |  |
Amortization period |  |  |  |  |  |  | 7 years |  |  |
Aidence | In-process research and development |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | 5,500,000 |  |  |  |  |  |
Aidence | Customer Relationships |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  | 5 years 4 months 24 days |  |  |
Aidence | Trade Names |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  | 7 years |  |  |
Aidence | Other Sellers |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock issued as consideration |  |  |  | $ 30,000,000 |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  | 1,117,872 |  |  |  |  |  |
Price per share (dollars per share) | $ / shares |  |  |  | $ 26.80 |  |  |  |  |  |
Aidence | Certain Seller |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock issued as consideration |  |  |  | $ 600,000 |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  | 23,362 |  |  |  |  |  |
Aidence | Contingent Milestone Consideration |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration to guarantee share value issued |  |  |  | $ 7,400,000 |  |  | $ 7,200,000 |  |  |
Aidence | Cash Holdback |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration to guarantee share value issued |  |  |  | 4,500,000 |  |  | 4,000,000 |  |  |
Quantib |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  | 42,300,000 |  |  |  |  |  |
Common stock issued as consideration |  |  |  | $ 25,900,000 |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  | 965,058 |  |  |  |  |  |
Consideration transferred |  |  |  | $ 11,800,000 |  |  |  |  |  |
Contingent consideration to guarantee share value issued |  |  |  |  |  |  | $ 3,709,000 | $ 0 |  |
Business combination, contingent consideration, liability, period |  |  |  | 18 months |  |  |  |  |  |
Current assets acquired |  |  |  | $ 2,400,000 |  |  |  |  |  |
Liabilities |  |  |  | 700,000 |  |  |  |  |  |
Long-term liabilities assumed |  |  |  | 6,700,000 |  |  |  |  |  |
Goodwill |  |  |  | 26,400,000 |  |  |  |  |  |
Property and equipment |  |  |  | 100,000 |  |  |  |  |  |
Intangible assets acquired |  |  |  | 21,300,000 |  |  |  |  |  |
Quantib | Software developed for internal use |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | 19,600,000 |  |  |  |  |  |
Quantib | In-process research and development |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | $ 700,000 |  |  |  |  |  |
Quantib | Other Sellers |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Price per share (dollars per share) | $ / shares |  |  |  | $ 26.80 |  |  |  |  |  |
Quantib | Measurement Input, Discount Rate | Valuation, Income Approach | Minimum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration liability, measurement input |  |  |  |  |  |  | 0.50 |  |  |
Quantib | Measurement Input, Discount Rate | Valuation, Income Approach | Maximum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration liability, measurement input |  |  |  |  |  |  | 0.55 |  |  |
Quantib | Contingent Milestone Consideration |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration to guarantee share value issued |  |  |  |  |  |  | $ 2,100,000 |  |  |
Quantib | Cash Holdback |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration to guarantee share value issued |  |  |  | $ 1,600,000 |  |  | $ 1,600,000 |  |  |
Quantib | Business Acsuition Contingent Consideration |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock issued as consideration |  |  |  | $ 3,000,000 |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  | 113,303 |  |  |  |  |  |

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