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FACILITY ACQUISITIONS AND ASSETS HELD FOR SALE (Details Narrative) - USD ($) $ in Thousands | Apr. 01, 2019 | Mar. 01, 2019 | Feb. 02, 2019 | Feb. 01, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  |  |  |  | $ 437,940 | $ 418,093
Kern Radiology Imaging Systems, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase consideration | $ 19,300 |  |  |  |  |
Fixed assets acquired | 7,600 |  |  |  |  |
Right-of-use asset required | 14,500 |  |  |  |  |
Other assets acquired | 36 |  |  |  |  |
Intangible assets acquired | 500 |  |  |  |  |
Operating lease liabilities acquired | 14,500 |  |  |  |  |
Goodwill acquired | 11,200 |  |  |  |  |
Zilkha Radiology |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase consideration | 4,500 |  |  |  |  |
Fixed assets acquired | 2,200 |  |  |  |  |
Right-of-use asset required | 5,100 |  |  |  |  |
Intangible assets acquired | 100 |  |  |  |  |
Operating lease liabilities acquired | 5,100 |  |  |  |  |
Goodwill acquired | $ 2,200 |  |  |  |  |
West Valley Imaging Group, LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase consideration |  |  |  | $ 3,000 |  |
Fixed assets acquired |  |  |  | 300 |  |
Other assets acquired |  |  |  | 7 |  |
Intangible assets acquired |  |  |  | 200 |  |
Goodwill acquired |  |  |  | $ 2,500 |  |
Payments to acquire equity method investments |  |  | $ 750 |  |  |
Noncontrolling interest, ownership percentage |  |  |  | 25.00% |  |
Ventura County Imaging Group, LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to acquire equity method investments |  | $ 10,400 |  |  |  |
Ownership percentage |  | 60.00% |  |  |  |
Dignity Health | Partnership | Ventura County Imaging Group, LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to acquire equity method investments |  | $ 6,100 |  |  |  |
Ownership percentage |  | 40.00% |  |  |  |
Payments to acquire equity method investments, Assets |  | $ 800 |  |  |  |
Ownership percentage in exchange for assets |  | 5.00% |  |  |  |
Payments to acquire equity method investments, Cash |  | $ 5,300 |  |  |  |
Ownership percentage in exchange for cash |  | 35.00% |  |  |  |

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