SUMMARY OF ACCOUNTING POLICIES (Details Narrative)				3 Months Ended		9 Months Ended
	Jul. 01, 2020 USD ($)	Nov. 05, 2019 USD ($)	Feb. 01, 2018 USD ($) shares	Mar. 31, 2021 USD ($) center joint_venture shares	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 21, 2019 shares	Sep. 30, 2019 USD ($)	Jan. 01, 2019 USD ($)	Mar. 01, 2018
Property, Plant and Equipment [Line Items]
Provider relief funding				$ 6,248,000	$ 0	$ 32,500,000
Contracts receivable, factoring receivable				20,500,000
Deferred financing costs, net of accumulated amortization				1,600,000			$ 1,800,000
Goodwill				502,566,000			472,879,000
Indefinite-lived intangible assets				7,100,000
Income tax expense (benefit)				$ 4,376,000	$ (4,381,000)
Effective tax rate				24.10%	23.80%
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
Total net assets				$ 66,458,000			61,644,000
Number of unconsolidated joint ventures | joint_venture				13
Management service fees				$ 5,200,000	$ 2,600,000
Number of securities without readily determinable fair value | center				3
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%
Total net assets				$ 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
Restated Plan
Property, Plant and Equipment [Line Items]
Shares authorized (in shares) | shares				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
2019 SWAPS
Property, Plant and Equipment [Line Items]
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
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				$ 1,600,000
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						39,500,000
Advance insurance carrier payments						5,000,000.0
Repayment of advance medicare payments				$ 2,500,000
Repayment of insurance advances				2,500,000
Deferred social security taxes				16,300,000
First Lien Credit Agreement | Line of Credit | Barclays | Revolving Credit Facility
Property, Plant and Equipment [Line Items]
Total credit facilities outstanding				$ 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