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SUMMARY OF ACCOUNTING POLICIES (Details Narrative) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 05, 2019 USD ($) | Mar. 01, 2018 USD ($) | Feb. 01, 2018 USD ($) shares | Mar. 24, 2017 USD ($) | Aug. 31, 2020 USD ($) | May 31, 2020 USD ($) | Apr. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) numberOfAgreement shares | Sep. 30, 2019 USD ($) | Mar. 31, 2019 | Sep. 30, 2020 USD ($) numberOfAgreement shares | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) joint_venture | Oct. 11, 2019 shares | Jun. 30, 2019 USD ($) | Jan. 01, 2019 USD ($) | Apr. 12, 2018
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provider relief funding |  |  |  |  |  |  |  | $ 221,000 | $ 0 |  | $ 25,696,000 | $ 0 |  |  |  |  |
Contracts receivable, factoring receivable |  |  |  |  |  |  |  | 20,400,000 |  |  | 20,400,000 |  |  |  |  |  |
Deferred financing costs, net of accumulated amortization |  |  |  |  |  |  |  | 1,900,000 |  |  | 1,900,000 |  | $ 1,600,000 |  |  |  |
Goodwill |  |  |  |  |  |  |  | 470,685,000 |  |  | 470,685,000 |  | 441,973,000 |  |  |  |
Indefinite-lived intangible assets |  |  |  |  |  |  |  | 11,300,000 |  |  | 11,300,000 |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  | $ 3,825,000 | $ 1,816,000 |  | $ (5,029,000) | $ 3,556,000 |  |  |  |  |
Effective tax rate |  |  |  |  |  |  |  | 27.20% | 26.30% |  | 28.30% | 24.80% |  |  |  |  |
Amount of loss recognized in income on derivative (current period ineffective portion) |  |  |  |  |  |  |  | $ 24,400,000 |  |  |  |  |  |  |  |  |
Monthly amortization of deferred hedge gains |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |
Total credit facilities outstanding |  |  |  |  |  |  |  | 0 |  |  | $ 0 |  | 0 |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00%
Aggregate cost |  |  |  |  |  |  |  | 63,956,000 |  |  | 63,956,000 |  | 60,375,000 |  |  |  |
Advance for future software subscription fees |  |  |  |  |  |  |  | 31,482,000 |  |  | 31,482,000 |  | $ 45,004,000 |  |  |  |
Number of unconsolidated joint ventures | joint_venture |  |  |  |  |  |  |  |  |  |  |  |  | 12 |  |  |  |
Management service fees |  |  |  |  |  |  |  | 2,700,000 | $ 1,800,000 |  | $ 8,600,000 | $ 7,800,000 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment award, award vesting period |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Share-based payment award, expiration period |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment award, award vesting period |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Share-based payment award, expiration period |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Medic Vision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 14.21% |  | 12.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  | $ 200,000 |  | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Option to purchase additional equity method investment |  |  |  | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage diluted |  | 1.96% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial ownership percentage after dilution |  | 12.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  |  |  |  | 1,200,000 |  |  | $ 1,200,000 |  |  |  |  |  |
Turner Imaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  | $ 2,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares purchased (in shares) | shares |  |  | 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock issued upon conversion (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,000 |  |  |
WhiteRabbit.ai Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to fund loan to related parties | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advance for future software subscription fees |  |  |  |  |  |  |  | $ 4,000,000.0 |  |  | $ 4,000,000.0 |  |  |  |  |  |
Santa Monica Imaging Group, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire additional interest in subsidiaries |  |  |  |  | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Restated Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) | shares |  |  |  |  |  |  |  | 14,000,000 |  |  | 14,000,000 |  |  |  |  |  |
Restated Plan | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment award, award vesting period |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Share-based payment award, expiration period |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Restated Plan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment award, award vesting period |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Share-based payment award, expiration period |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
2016 Caps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of forward interest rate cap agreements | numberOfAgreement |  |  |  |  |  |  |  | 2 |  |  | 2 |  |  |  |  |  |
Premium liability for 2016 Caps |  |  |  |  |  |  |  | $ 5,300,000 |  |  | $ 5,300,000 |  |  |  |  |  |
2016 Caps | September 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts |  |  |  |  |  |  |  | 150,000,000 |  |  | 150,000,000 |  |  |  |  |  |
2016 Caps | October 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts |  |  |  |  |  |  |  | $ 350,000,000 |  |  | $ 350,000,000 |  |  |  |  |  |
2019 SWAPS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of forward interest rate cap agreements | numberOfAgreement |  |  |  |  |  |  |  | 4 |  |  | 4 |  |  |  |  |  |
Notional amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |
2019 SWAPS | October 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |
2019 SWAPS | October 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |
Amounts returned to property and equipment | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPE estimated useful lives |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Amounts returned to property and equipment | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPE estimated useful lives |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Leasehold Improvements | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPE estimated useful lives |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Leasehold Improvements | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPE estimated useful lives |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
2016 Caps | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 2.00% |  |  | 2.00% |  |  |  |  |  |
2019 swaps - Interest Rate Contracts | 2019 SWAPS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |
2019 swaps - Interest Rate Contracts | 2019 SWAPS1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |
2019 swaps - Interest Rate Contracts | London Interbank Offered Rate (LIBOR) | 2019 SWAPS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.96% |  |
2019 swaps - Interest Rate Contracts | London Interbank Offered Rate (LIBOR) | 2019 SWAPS1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.05% |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs, net of accumulated amortization |  |  |  |  |  |  |  | $ 1,900,000 |  |  | $ 1,900,000 |  |  |  |  |  |
Dignity Health | Glendale Advanced Imaging | Joint Venture | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest entity, ownership percentage |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |
Dignity Health | Glendale Advanced Imaging | Joint Venture | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest entity, ownership percentage |  |  |  |  |  |  |  |  |  | 55.00% |  |  |  |  |  |  |
Promissory Note | Turner Imaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible promissory note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |
COVID-19 Pandemic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advance medicare payments |  |  |  |  |  |  | $ 39,400,000 |  |  |  |  |  |  |  |  |  |
Advance insurance carrier payments |  |  |  |  |  | $ 5,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Deferred social security taxes |  |  |  |  |  |  |  | 10,800,000 |  |  | 10,800,000 |  |  |  |  |  |
First Lien Credit Agreement | Line of Credit | Barclays | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total credit facilities outstanding |  |  |  |  |  |  |  | 0 |  |  | 0 |  | $ 0 |  |  |  |
Paycheck Protection Program loans at 1% due April 2022 | COVID-19 Pandemic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face Value |  |  |  |  |  |  |  | $ 4,000,000.0 |  |  | $ 4,000,000.0 |  |  |  |  |  |

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