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