SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details - Narrative)					3 Months Ended	12 Months Ended			24 Months Ended		40 Months Ended
	Nov. 01, 2022 USD ($) center	Jan. 20, 2022 USD ($) loan shares	Nov. 05, 2019 USD ($)	Feb. 01, 2018 USD ($) shares	Sep. 30, 2021 USD ($)	Dec. 31, 2022 USD ($) incentivePlan investment jointVenture	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Oct. 31, 2025 USD ($)	Dec. 31, 2021 USD ($)	Oct. 31, 2023 USD ($)	Oct. 01, 2022 USD ($)	Apr. 15, 2021 shares	Jul. 01, 2020 USD ($)	Oct. 11, 2019 shares	Jun. 30, 2019 USD ($) agreement	Jan. 01, 2019 USD ($)	Dec. 31, 2016 USD ($) agreement
Property, Plant and Equipment [Line Items]
Government Assistance, Statement of Financial Position [Extensible Enumeration]						Deferred revenue
Factoring receivable						$ 15,400,000	$ 17,700,000			$ 17,700,000
Service fee revenue						1,430,061,000	1,315,077,000	$ 1,071,840,000
Deferred financing costs, net of accumulated amortization						2,300,000	2,100,000			2,100,000
Goodwill						677,665,000	513,820,000	472,879,000		513,820,000
Indefinite lived intangible assets						24,100,000	20,600,000			20,600,000
Loss on impairment						0	$ 0	4,170,000
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]							Gain (Loss) on Termination of Lease
Lease abandonment charges							$ 12,600,000
Workers' compensation liability, current						3,900,000	3,500,000			3,500,000
Medical malpractice deductible per incidence						$ 10,000
Employer matching contribution, percent						1.00%
Employee contribution, percent						4.00%
Expected employee contribution						$ 3,000,000		0
Number of plans | incentivePlan						1
Shares authorized (in shares) | shares													16,500,000
Accumulated other comprehensive income						$ 332,995,000	228,904,000			228,904,000
Number of investments | investment						3
Number of unconsolidated joint ventures | jointVenture						13
Management service fees						$ 22,200,000	19,600,000	11,300,000
Medic Vision
Property, Plant and Equipment [Line Items]
Total net assets						$ 1,200,000
Equity interest percentage						14.21%
Turner Imaging Systems
Property, Plant and Equipment [Line Items]
Investment at cost				$ 2,000,000
Shares purchased (in shares) | shares				2,100,000
Preferred stock issued upon conversion (in shares) | shares															80,000
Turner Imaging Systems | Promissory note
Property, Plant and Equipment [Line Items]
Convertible promissory note																	$ 100,000
WhiteRabbit.ai Inc.
Property, Plant and Equipment [Line Items]
Investment at cost			$ 1,000,000
Payments to fund loan to related parties			$ 2,500,000
Arizona Diagnostics Group
Property, Plant and Equipment [Line Items]
Equity interest percentage	49.00%
Investment at cost	$ 12,700,000
Additional contribution						$ 1,400,000
Number of assets sold | center	8
Different between the sales price and carrying value	$ (500,000)
Received a dividend from the partnership	4,500,000
Book value of RadNet joint venture interests	8,300,000
Forecast
Property, Plant and Equipment [Line Items]
Monthly amortization of deferred hedge gains									$ 300,000
Forecast | Subsequent Event
Property, Plant and Equipment [Line Items]
Monthly amortization of deferred hedge gains											$ 400,000
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Property, Plant and Equipment [Line Items]
Accumulated other comprehensive income														$ 24,400,000
2016 Caps | LIBOR
Property, Plant and Equipment [Line Items]
Basis spread on variable rate																		2.00%
September 2020
Property, Plant and Equipment [Line Items]
Notional amounts																		$ 150,000,000
October 2020
Property, Plant and Equipment [Line Items]
Notional amounts																		$ 350,000,000
2016 Caps
Property, Plant and Equipment [Line Items]
Number of forward interest rate cap agreements | agreement																		2,000
Interest rate caps premium liability																		$ 5,300,000
2019 SWAPS
Property, Plant and Equipment [Line Items]
Number of forward interest rate cap agreements | agreement																4,000
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 | 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]
Number of forward interest rate cap agreements | agreement																2
Notional amounts																$ 200,000,000
2019 SWAPS1 | 2019 SWAPS - Interest Rate Contracts
Property, Plant and Equipment [Line Items]
Notional amounts																$ 400,000,000
2019 SWAPS1 | 2019 SWAPS - Interest Rate Contracts | LIBOR
Property, Plant and Equipment [Line Items]
Basis spread on variable rate																2.05%
Quantib
Property, Plant and Equipment [Line Items]
Goodwill		$ 26,400,000
Contingent consideration to guarantee share value issued						3,709,000	0			0
Business combination, contingent consideration, liability, period		18 months
Business acquisition, equity interest issued or issuable, additional number of shares | shares		113,303
Business acquisition, equity interest issued or issuable, fair value of additional shares issued after execution		$ 3,000,000
Quantib | Contingent Milestone Consideration
Property, Plant and Equipment [Line Items]
Contingent consideration to guarantee share value issued						2,100,000
Quantib | Cash Holdback
Property, Plant and Equipment [Line Items]
Contingent consideration to guarantee share value issued		1,600,000				1,600,000
Montclair
Property, Plant and Equipment [Line Items]
Contingent consideration to guarantee share value issued						1,200,000	0			0		$ 1,200,000
Heart and Lung Imaging Limited
Property, Plant and Equipment [Line Items]
Goodwill	16,200,000
Contingent consideration to guarantee share value issued	$ 10,800,000					11,656,000	0			0
Business combination, contingent consideration, liability, period	24 months
Heart and Lung Imaging Limited | Contingent Milestone Consideration
Property, Plant and Equipment [Line Items]
Contingent consideration to guarantee share value issued	$ 10,200,000					11,100,000
Heart and Lung Imaging Limited | Cash Holdback
Property, Plant and Equipment [Line Items]
Contingent consideration to guarantee share value issued	$ 600,000
Aidence
Property, Plant and Equipment [Line Items]
Goodwill		22,900,000
Purchase agreements		$ 10,000,000
Number of identified milestones | loan		2
Contingent consideration to guarantee share value issued		$ 11,900,000				11,158,000	0			0
Percent of FDA approval and payout, milestone one		80.00%
Percent of FDA approval and payout, milestone two		70.00%
Aidence | Contingent Milestone Consideration
Property, Plant and Equipment [Line Items]
Contingent consideration to guarantee share value issued		$ 7,400,000				7,200,000
Aidence | Cash Holdback
Property, Plant and Equipment [Line Items]
Contingent consideration to guarantee share value issued		$ 4,500,000				4,000,000
Reinsurance Policy, Type [Axis]: Health Insurance Member
Property, Plant and Equipment [Line Items]
Self-insurance accrual						7,400,000	6,300,000			6,300,000
Trade Names
Property, Plant and Equipment [Line Items]
Indefinite lived intangible assets						$ 7,100,000
Loss on impairment								4,200,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Impairment of long lived asset							7,100,000
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 | 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
Minimum | Blue Shield
Property, Plant and Equipment [Line Items]
Stop loss policy claim amount						$ 250,000
Minimum | Dignity Health | Glendale Advanced Imaging | Joint Venture
Property, Plant and Equipment [Line Items]
Economic interest						35.00%
Minimum | Propery and equipment, net
Property, Plant and Equipment [Line Items]
PP&E useful life						3 years
Minimum | Leasehold improvements
Property, Plant and Equipment [Line Items]
PP&E useful life						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 | 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
Maximum | Blue Shield
Property, Plant and Equipment [Line Items]
Stop loss policy claim amount						$ 1,000,000
Maximum | Dignity Health | Glendale Advanced Imaging | Joint Venture
Property, Plant and Equipment [Line Items]
Economic interest						55.00%
Maximum | Propery and equipment, net
Property, Plant and Equipment [Line Items]
PP&E useful life						15 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
PP&E useful life						15 years
Imaging Centers
Property, Plant and Equipment [Line Items]
Goodwill						$ 606,483,000	489,210,000	448,269,000		489,210,000
Net service fee revenue | eRAD
Property, Plant and Equipment [Line Items]
Service fee revenue						13,200,000	10,500,000	8,600,000
Barclays
Property, Plant and Equipment [Line Items]
Total credit facilities outstanding						0	0			0
Truist
Property, Plant and Equipment [Line Items]
Total credit facilities outstanding						0	0			0
C O V I D19 Pandemic
Property, Plant and Equipment [Line Items]
Advance medicare payments							100,000	39,500,000		39,600,000
Proceeds from provider relief funding						0	9,100,000	$ 26,300,000		$ 35,400,000
Repayment of advance medicare payments						30,200,000	$ 8,400,000
Amount in deferred revenue						$ 1,000,000
Refundable claim percentage						50.00%	50.00%	50.00%		50.00%
Deferred social security taxes								$ 16,300,000
Reduction in deferred social security taxes					$ 7,700,000
C O V I D19 Pandemic | Paycheck Protection Program Loans
Property, Plant and Equipment [Line Items]
Proceeds from loans								$ 4,000,000