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BUSINESS COMBINATIONS AND RELATED ACTIVITY - Narrative (Details) € in Millions				1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 01, 2026 USD ($) center	Mar. 02, 2026 USD ($)	Mar. 21, 2025 USD ($)	Feb. 02, 2026 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	May 01, 2026	Mar. 02, 2026 EUR (€)	Dec. 31, 2025 USD ($)
Business Combination [Line Items]
Number of joint ventures \| center	6
Increase of additional paid-in capital					$ 8,848,000		$ 8,848,000
Gain on contribution of imaging centers into joint venture					7,528,000	$ 0	7,528,000	$ 0
Milestone contingent consideration					11,600,000		11,600,000
Goodwill					1,136,986,000		1,136,986,000					$ 907,663,000
Intermountain Medical Imaging
Business Combination [Line Items]
Ownership interest purchased										50.00%
Ownership interest			51.00%
Payments to acquire additional interest in subsidiaries			$ 15,200,000
Intermountain Medical Imaging \| Saint Alphonsus Diversified Care, LLC
Business Combination [Line Items]
Ownership interest			49.00%
Intermountain Medical Imaging \| Saint Alphonsus Diversified Care, LLC
Business Combination [Line Items]
Ownership interest purchased										1.00%
Business Acquisitions
Business Combination [Line Items]
Consideration transferred					107,171,000		107,171,000
Goodwill					62,993,000		62,993,000
Property, plant, and equipment					68,156,000		68,156,000
Regional Radiology Center And Northwest Radiology Network PC
Business Combination [Line Items]
Cash payment to acquire business				$ 78,100,000
Holdback consideration				3,000,000.0
Net of cash acquired				3,800,000
Noncash consideration				21,200,000
Notes payable				$ 1,000,000.0
Maryland Imaging Partners, LLC
Business Combination [Line Items]
Number of businesses acquired \| center	19
Increase of additional paid-in capital	$ 8,800,000
Maryland Imaging Partners, LLC \| Advanced Imaging at St. Joseph Medical Center, LLC
Business Combination [Line Items]
Ownership interest purchased	49.00%
Maryland Imaging Partners, LLC \| Baltimore Washington Imaging, LLC
Business Combination [Line Items]
Ownership interest purchased	35.00%
Maryland Imaging Partners, LLC \| Maryland Imaging Partners, LLC
Business Combination [Line Items]
Ownership interest	80.00%
Minority partner ownership percent	20.00%
Advanced/Upper Chesapeake Health Center, LLC
Business Combination [Line Items]
Number of businesses acquired \| center	5
Gleamer SAS
Business Combination [Line Items]
Cash payment to acquire business		$ 255,500,000
Purchase consideration		264,100,000
Milestone contingent consideration		8,600,000			$ 15,530,000		$ 15,530,000		$ 8,682,000		€ 15.0	$ 0
Range of outcomes (upto) \| €											€ 15.0
Goodwill		171,600,000
Intangible assets		110,900,000
Cash acquired		16,200,000
Other operating assets		14,200,000
Property, plant, and equipment		300,000
Deferred tax liabilities acquired		21,500,000
Debt and other liability, noncurrent		27,600,000
Gleamer SAS \| Developed Technology Rights
Business Combination [Line Items]
Intangible assets		$ 29,200,000
Weighted average useful life (in years)		8 years
Gleamer SAS \| Customer lists
Business Combination [Line Items]
Intangible assets		$ 72,500,000
Weighted average useful life (in years)		17 years
Gleamer SAS \| Trade names definite life
Business Combination [Line Items]
Intangible assets		$ 3,500,000
Gleamer SAS \| Trade names definite life \| Minimum
Business Combination [Line Items]
Weighted average useful life (in years)		3 years
Gleamer SAS \| Trade names definite life \| Maximum
Business Combination [Line Items]
Weighted average useful life (in years)		6 years
Gleamer SAS \| Other Intangible Assets
Business Combination [Line Items]
Intangible assets		$ 5,600,000
Gleamer SAS \| Other Intangible Assets \| Minimum
Business Combination [Line Items]
Weighted average useful life (in years)		1 year
Gleamer SAS \| Other Intangible Assets \| Maximum
Business Combination [Line Items]
Weighted average useful life (in years)		3 years
Advanced Imaging at St. Joseph Medical Center, LLC
Business Combination [Line Items]
Consideration transferred	$ 7,600,000
Gain on contribution of imaging centers into joint venture	7,500,000
Goodwill	2,343,000
Property, plant, and equipment	$ 7,518,000
Advanced Imaging at St. Joseph Medical Center, LLC \| Advanced Imaging at St. Joseph Medical Center, LLC
Business Combination [Line Items]
Ownership interest	80.00%