SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Software Revenue Recognition, Software Development Costs, Deferred Financing Costs And Property And Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Service fee revenue	$ 1,829,664	$ 1,616,630	$ 1,430,061
Deferred financing costs, net of accumulated amortization	2,300	1,600
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Property, Plant and Equipment [Line Items]
Revenue, remaining performance obligation, amount	$ 1,200
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months
Minimum | Software and Software Development Costs
Property, Plant and Equipment [Line Items]
PP&E useful life	1 year
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 | Software and Software Development Costs
Property, Plant and Equipment [Line Items]
PP&E useful life	12 years
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
Patient Services, Net | eRAD
Property, Plant and Equipment [Line Items]
Service fee revenue	$ 27,800	$ 20,200	$ 13,200