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ACQUISITIONS, DISPOSITIONS AND BUSINESS VENTURE ACTIVITY (Details - Assets and Liabilities Assumed) - USD ($) $ in Thousands |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 24, 2021 | Dec. 31, 2021 | Dec. 06, 2021 | Dec. 01, 2021 | Jun. 01, 2021 | May 01, 2021 | Apr. 01, 2021 | Mar. 01, 2021 | Feb. 01, 2021 | Dec. 31, 2020 | Nov. 01, 2020 | Aug. 31, 2020 | Mar. 02, 2020 | Jan. 02, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 513,820 |  |  |  |  |  |  |  | $ 472,879 |  |  |  |  | $ 441,973
Personal Health Imaging PLLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  |  | $ 2,995 |  |  |  |  |  |
Property & Equipment |  |  |  |  |  |  |  |  | 576 |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  |  | 608 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 2,355 |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  | 50 |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  | (608) |  |  |  |  |  |
ZP Elmont LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  |  | 2,194 |  |  |  |  |  |
Property & Equipment |  |  |  |  |  |  |  |  | 1,112 |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 1,005 |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  | 50 |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  | 27 |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
ZP Freeport LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  |  | 6,065 |  |  |  |  |  |
Property & Equipment |  |  |  |  |  |  |  |  | 4,668 |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 1,328 |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  | 40 |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  | 29 |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Broadway Medical Imaging LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  |  | 1,155 |  |  |  |  |  |
Property & Equipment |  |  |  |  |  |  |  |  | 1,076 |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  |  | 446 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  | 50 |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  | 23 |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  | (446) |  |  |  |  |  |
3235 Hempstead LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  |  | 9,386 |  |  |  |  |  |
Property & Equipment |  |  |  |  |  |  |  |  | 5,667 |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 3,649 |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  | 70 |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
SLZM Realty LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  |  | 13,671 |  |  |  |  |  |
Property & Equipment |  |  |  |  |  |  |  |  | 4,617 |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 8,974 |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  | 80 |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
2012 Sunrise Merrick LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  |  | 11,428 |  |  |  |  |  |
Property & Equipment |  |  |  |  |  |  |  |  | 2,741 |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  |  | 335 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 8,617 |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  | 70 |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  | $ (335) |  |  |  |  |  |
ZP Bayside LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  | $ 3,545 |  |  |  |  |  |  |
Property & Equipment |  |  |  |  |  |  |  | 3,385 |  |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  | 2,191 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 40 |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  | 50 |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  | 70 |  |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  | (2,191) |  |  |  |  |  |  |
ZP Laurelton LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  | 2,658 |  |  |  |  |  |  |
Property & Equipment |  |  |  |  |  |  |  | 2,530 |  |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  | 1,418 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 32 |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  | 50 |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  | 46 |  |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  | (1,418) |  |  |  |  |  |  |
ZP Smith LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  | 3,978 |  |  |  |  |  |  |
Property & Equipment |  |  |  |  |  |  |  | 3,581 |  |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  | 2,214 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 347 |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  | 50 |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  | $ (2,214) |  |  |  |  |  |  |
ZP 907 Northern LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  | $ 562 |  |  |  |  |  |  |  |
Property & Equipment |  |  |  |  |  |  | 507 |  |  |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  |  | 1,817 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  |  | 50 |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  | $ (1,817) |  |  |  |  |  |  |  |
William M. Kelly MD, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  | 2,346 | $ 4,404 |  |  | $ 3,750 |  |  |  |  |  |  |  |  |
Property & Equipment |  | 99 | 701 |  |  | 990 |  |  |  |  |  |  |  |  |
Right of Use Assets |  | 323 | 0 |  |  | 1,379 |  |  |  |  |  |  |  |  |
Goodwill |  | 2,197 | 3,653 |  |  | 2,710 |  |  |  |  |  |  |  |  |
Intangible Assets |  | 50 | 50 |  |  | 50 |  |  |  |  |  |  |  |  |
Other Assets |  | 0 | 0 |  |  | 0 |  |  |  |  |  |  |  |  |
Right of Use Liabilities |  | (323) | $ 0 |  |  | (1,379) |  |  |  |  |  |  |  |  |
60th Street MRI, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  | 400 |  |  |  |  |  |  |  |  |
Property & Equipment |  |  |  |  |  | 85 |  |  |  |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 290 |  |  |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  | 25 |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
ZP Parkchester LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  | 263 |  |  |  |  |  |  |  |  |
Property & Equipment |  |  |  |  |  | 213 |  |  |  |  |  |  |  |  |
Right of Use Assets |  |  |  |  |  | 311 |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Intangible Assets |  |  |  |  |  | 50 |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  |  | $ (311) |  |  |  |  |  |  |  |  |
ZP Eastern LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  | $ 2,868 |  |  |  |  |  |  |  |  |  |
Property & Equipment |  |  |  |  | 2,801 |  |  |  |  |  |  |  |  |  |
Right of Use Assets |  |  |  |  | 1,951 |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 17 |  |  |  |  |  |  |  |  |  |
Intangible Assets |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Right of Use Liabilities |  |  |  |  | $ (1,951) |  |  |  |  |  |  |  |  |  |
Tangent Associates LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration | $ 2,025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property & Equipment | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right of Use Assets | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 379 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets | 1,636 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right of Use Liabilities | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | 67,658 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mid Delaware Imaging P.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  | $ 6,023 |  |  |  |  |  |  |  |  |  |  |
Property & Equipment |  |  |  | 590 |  |  |  |  |  |  |  |  |  |  |
Right of Use Assets |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 5,260 |  |  |  |  |  |  |  |  |  |  |
Intangible Assets |  |  |  | 150 |  |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  | 23 |  |  |  |  |  |  |  |  |  |  |
Right of Use Liabilities |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |
Olney Open MRI, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,751 |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  | 849 |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | 602 |
Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 300 |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,300) |
MRI of Woodbridge LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,608 |  |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  |  | 464 |  |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  |  | 1,081 |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 1,833 |  |
Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  | 300 |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,081) |  |
AZ-Tech Radiology and Open MRI, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  |  |  |  |  | $ 5,462 |  |  |
Property & Equipment |  |  |  |  |  |  |  |  |  |  |  | 2,532 |  |  |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  |  | 7,552 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 2,882 |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  | 48 |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  |  | $ (7,552) |  |  |
ZP Atlantic LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  |  |  |  | $ 8,871 |  |  |  |
Property & Equipment |  |  |  |  |  |  |  |  |  |  | 7,931 |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  | 6,181 |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | 828 |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |  |  | 50 |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  | 62 |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  | (6,181) |  |  |  |
ZP Elmhurst LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  |  |  |  |  |  |  |  |  |  | 12,269 |  |  |  |
Property & Equipment |  |  |  |  |  |  |  |  |  |  | 10,681 |  |  |  |
Right of Use Assets |  |  |  |  |  |  |  |  |  |  | 12,571 |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | 1,463 |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |  |  | 50 |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  | 75 |  |  |  |
Right of Use Liabilities |  |  |  |  |  |  |  |  |  |  | $ (12,571) |  |  |  |
Business Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Consideration |  | 79,716 |  |  |  |  |  |  |  | 30,961 |  |  |  |  |
Property & Equipment |  | 35,949 |  |  |  |  |  |  |  | 22,457 |  |  |  |  |
Right of Use Assets |  | 12,993 |  |  |  |  |  |  |  | 28,685 |  |  |  |  |
Goodwill |  | 40,864 |  |  |  |  |  |  |  | 7,608 |  |  |  |  |
Intangible Assets |  | 2,671 |  |  |  |  |  |  |  | 700 |  |  |  |  |
Other Assets |  | 232 |  |  |  |  |  |  |  | 196 |  |  |  |  |
Right of Use Liabilities |  | $ (12,993) |  |  |  |  |  |  |  | $ (28,685) |  |  |  |  |
Shares issued (in shares) |  | 67,658,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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