SIGNIFICANT ACCOUNTING POLICIES (Details - Narrative)						3 Months Ended		9 Months Ended		12 Months Ended		24 Months Ended		40 Months Ended
	Jun. 24, 2022 USD ($)	Jan. 20, 2022 USD ($) milestone $ / shares shares	Jul. 01, 2020 USD ($)	Nov. 05, 2019 USD ($)	Feb. 01, 2018 USD ($) shares	Sep. 30, 2022 USD ($) incentivePlan jointVenture security	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) incentivePlan jointVenture security	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Oct. 30, 2025 USD ($)	Dec. 31, 2021 USD ($)	Oct. 31, 2023 USD ($)	Dec. 31, 2022	Jun. 30, 2022 USD ($)	Apr. 15, 2021 incentivePlan shares	Dec. 21, 2019 shares	Jun. 30, 2019 USD ($) agreement	Jan. 01, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Contracts receivable, factoring receivable						$ 15,500,000		$ 15,500,000		$ 17,700,000			$ 17,700,000
Deferred financing costs, net of accumulated amortization						1,800,000		1,800,000		2,100,000			2,100,000
Goodwill						575,092,000		575,092,000		513,820,000			513,820,000
Indefinite-lived intangible assets						12,700,000		12,700,000
Income tax expense						$ 2,188,000	$ 5,284,000	$ 7,087,000	$ 12,534,000
Effective tax rate						25.30%	20.00%	19.80%	22.60%
Number of plans | incentivePlan						1		1									1
Number of shares authorized (in shares) | shares																	16,500,000
Amount of loss recognized in income on derivative (current period ineffective portion)			$ 24,400,000
Share price (dollars per share) | $ / shares		$ 20.35
Total credit facilities outstanding						$ 0		$ 0		0			0
Number of securities without readily determinable fair value | security						3		3
Number of unconsolidated joint ventures | jointVenture						13		13
Management service fees						$ 6,100,000	$ 5,300,000	$ 17,200,000	$ 16,000,000
Equity contributions in existing joint ventures	$ 1,400,000							1,441,000
Medic Vision
Property, Plant and Equipment [Line Items]
Total net assets						$ 1,200,000		$ 1,200,000
Ownership percentage						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
Preferred stock issued upon conversion (in shares) | shares																		80,000
Turner Imaging | Promissory Note
Property, Plant and Equipment [Line Items]
Short-term debt																				$ 100,000
WhiteRabbit.ai Inc.
Property, Plant and Equipment [Line Items]
Payments to acquire equity method investments				$ 1,000,000
Payments to fund loan to related parties				$ 2,500,000
Aidence Holding B.V. and Quantib B.V
Property, Plant and Equipment [Line Items]
Goodwill from acquisitions								$ 7,300,000
Quantib B.V
Property, Plant and Equipment [Line Items]
Goodwill		$ 22,200,000
Milestone contingent consideration						$ 10,228,000		$ 10,228,000		0			0			$ 8,437,000
Contingent consideration, liability, period		18 months						18 months
Additional number of shares issued (in shares) | shares		113,303
Fair value of additional shares issued after execution		$ 3,000,000
Aidence Holding B.V.
Property, Plant and Equipment [Line Items]
Contingent consideration (up to)		$ 10,000,000
Number of identified milestones | milestone		2
Milestone contingent consideration		$ 7,400,000				7,900,000		$ 7,900,000
Chance of FDA approval, percent, milestone one		90.00%
Chance of FDA approval, percent, milestone two		80.00%
Revolving Credit Facility
Property, Plant and Equipment [Line Items]
Deferred financing costs, net of accumulated amortization						1,800,000		$ 1,800,000
Forecast
Property, Plant and Equipment [Line Items]
Monthly amortization of deferred hedge gains												$ 300,000		$ 400,000
2019 SWAPS
Property, Plant and Equipment [Line Items]
Number of forward interest rate cap agreements | agreement																			4
Notional amounts																			$ 500,000,000
2019 SWAPS | 2019 Swaps - Interest Rate Contracts
Property, Plant and Equipment [Line Items]
Notional amounts																			$ 100,000,000
2019 SWAPS | 2019 Swaps - Interest Rate Contracts | London Interbank Offered Rate (LIBOR)
Property, Plant and Equipment [Line Items]
Basis spread on variable rate																			1.96%
2019 SWAPS | October 2023
Property, Plant and Equipment [Line Items]
Number of forward interest rate cap agreements | agreement																			2
Notional amounts																			$ 50,000,000
2019 SWAPS | October 2025
Property, Plant and Equipment [Line Items]
Notional amounts																			200,000,000
2019 SWAPS | 2019 Swaps - Interest Rate Contracts
Property, Plant and Equipment [Line Items]
Notional amounts																			$ 400,000,000
2019 SWAPS | 2019 Swaps - Interest Rate Contracts | London Interbank Offered Rate (LIBOR)
Property, Plant and Equipment [Line Items]
Basis spread on variable rate																			2.05%
Restated Plan
Property, Plant and Equipment [Line Items]
Number of shares authorized (in shares) | shares																	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 | Dignity Health | Joint Venture | Glendale Advanced Imaging
Property, Plant and Equipment [Line Items]
Variable interest entity, ownership percentage								35.00%
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
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 | Dignity Health | Joint Venture | Glendale Advanced Imaging
Property, Plant and Equipment [Line Items]
Variable interest entity, ownership percentage								55.00%
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
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										100,000	$ 39,500,000		39,600,000
Proceeds from provider relief funding							$ 0		$ 6,300,000	$ 9,100,000	$ 26,300,000		$ 35,400,000
Repayment of advance medicare payments								38,600,000
Refundable claim percentage										50.00%	50.00%		50.00%
Deferred social security taxes						$ 8,100,000		$ 8,100,000			$ 16,300,000
Reduction in deferred social security taxes										$ 7,700,000
COVID-19 Pandemic | Forecast
Property, Plant and Equipment [Line Items]
Refundable claim percentage															50.00%
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