SIGNIFICANT ACCOUNTING POLICIES (Details Narrative)				3 Months Ended		6 Months Ended		12 Months Ended	18 Months Ended	24 Months Ended
	Jul. 01, 2020 USD ($)	Nov. 05, 2019 USD ($)	Feb. 01, 2018 USD ($) shares	Jun. 30, 2021 USD ($) security jointVenture shares	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) security jointVenture shares	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) security jointVenture shares	Oct. 31, 2025 USD ($)	Apr. 15, 2021 shares	Oct. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 21, 2019 shares	Jun. 30, 2019 USD ($) agreement	Jan. 01, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Provider relief funding				$ 43,000	$ 25,475,000	$ 6,291,000	$ 25,475,000
Contracts receivable, factoring receivable				19,800,000		19,800,000		$ 20,500,000	$ 19,800,000
Deferred financing costs, net of accumulated amortization				2,400,000		2,400,000		1,800,000	2,400,000
Goodwill				502,331,000		502,331,000		472,879,000	502,331,000
Indefinite-lived intangible assets				7,100,000		7,100,000			7,100,000			$ 4,200,000
Income tax expense (benefit)				$ 2,874,000	$ (4,475,000)	$ 7,249,000	$ (8,856,000)
Effective tax rate				26.20%	33.30%	24.90%	27.80%
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	$ 0
Number of securities without readily determinable fair value | security				3		3			3
Number of unconsolidated joint ventures | jointVenture				13		13			13
Management service fees				$ 5,500,000	$ 3,300,000	$ 10,800,000	$ 5,900,000
Equity contributions in existing joint ventures						1,441,000
Medic Vision
Property, Plant and Equipment [Line Items]
Total net assets				$ 1,200,000		$ 1,200,000			$ 1,200,000
Ownership percentage				14.21%		14.21%			14.21%
Turner Imaging
Property, Plant and Equipment [Line Items]
Number of shares purchased (in shares) | shares			2,100,000
Payments to acquire equity method investments			$ 2,000,000.0
Preferred stock issued upon conversion (in shares) | shares														80,000
Turner Imaging | Promissory Note
Property, Plant and Equipment [Line Items]
Convertible promissory note																$ 100,000
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
2019 SWAPS
Property, Plant and Equipment [Line Items]
Number of forward interest rate cap agreements | agreement															4
Notional amounts															$ 500,000,000
Revolving Credit Facility
Property, Plant and Equipment [Line Items]
Deferred financing costs, net of accumulated amortization				$ 2,400,000		$ 2,400,000			$ 2,400,000
Forecast
Property, Plant and Equipment [Line Items]
Monthly amortization of deferred hedge gains										$ 300,000
Interest rate contracts | 2019 SWAPS
Property, Plant and Equipment [Line Items]
Notional amounts													$ 100,000,000
Interest rate contracts | 2019 SWAPS1
Property, Plant and Equipment [Line Items]
Notional amounts													$ 400,000,000
Interest rate contracts | London Interbank Offered Rate (LIBOR) | 2019 SWAPS
Property, Plant and Equipment [Line Items]
Basis spread on variable rate													1.96%
Interest rate contracts | London Interbank Offered Rate (LIBOR) | 2019 SWAPS1
Property, Plant and Equipment [Line Items]
Basis spread on variable rate													2.05%
October 2023 | 2019 SWAPS
Property, Plant and Equipment [Line Items]
Number of forward interest rate cap agreements | agreement															2
Notional amounts															$ 50,000,000
October 2025 | 2019 SWAPS
Property, Plant and Equipment [Line Items]
Number of forward interest rate cap agreements | agreement															2
Notional amounts															$ 200,000,000
Restated Plan
Property, Plant and Equipment [Line Items]
Shares authorized (in shares) | shares				16,500,000		16,500,000			16,500,000		16,500,000
Minimum
Property, Plant and Equipment [Line Items]
Share-based payment award, award vesting period						3 years
Share-based payment award, expiration period						5 years
Minimum | Amounts returned to property and equipment
Property, Plant and Equipment [Line Items]
PPE estimated useful lives						3 years
Minimum | Leasehold Improvements
Property, Plant and Equipment [Line Items]
PPE estimated useful lives						3 years
Minimum | Dignity Health | Glendale Advanced Imaging | Joint Venture
Property, Plant and Equipment [Line Items]
Variable interest entity, ownership percentage						35.00%
Minimum | Restated Plan
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
Maximum | Amounts returned to property and equipment
Property, Plant and Equipment [Line Items]
PPE estimated useful lives						15 years
Maximum | Leasehold Improvements
Property, Plant and Equipment [Line Items]
PPE estimated useful lives						15 years
Maximum | Dignity Health | Glendale Advanced Imaging | Joint Venture
Property, Plant and Equipment [Line Items]
Variable interest entity, ownership percentage						55.00%
Maximum | Restated Plan
Property, Plant and Equipment [Line Items]
Share-based payment award, award vesting period						5 years
Share-based payment award, expiration period						10 years
First Lien Credit Agreement | Revolving Credit Facility | Barclays | Line of Credit
Property, Plant and Equipment [Line Items]
Total credit facilities outstanding				$ 0		$ 0		0	$ 0
COVID-19 Pandemic
Property, Plant and Equipment [Line Items]
Advance medicare payments								39,500,000
Advance insurance carrier payments								5,000,000.0
Repayment of advance medicare payments						10,300,000
Repayment of insurance advances						3,800,000
Deferred social security taxes				$ 16,300,000		16,300,000		16,300,000	16,300,000
Proceeds from provider relief funding						$ 6,300,000		26,300,000	$ 32,600,000
COVID-19 Pandemic | Paycheck Protection Program loans at 1% due April 2022
Property, Plant and Equipment [Line Items]
Proceeds from PPP loans								$ 4,000,000.0