BUSINESS COMBINATIONS - Schedule of Purchase Price Paid for Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Purchase Price:
Cash used in acquisitions, net of cash acquired of $— and $—, respectively	$ 94,561	$ 103,560
Allocated as follows:
Excess purchase price allocated to goodwill	1,194,100		$ 1,120,056
Waste Collection Acquisitions
Purchase Price:
Cash used in acquisitions, net of cash acquired of $— and $—, respectively	93,058	103,498
Cash acquired from acquisition	0	0
Settlements due from sellers	(302)	0
Total consideration	92,756	103,498
Allocated as follows:
Current assets	3,069	5,727
Land	1,389	3,160
Buildings and improvements	4,909	4,260
Machinery, equipment and other	12,373	17,895
Operating lease right-of-use assets	0	8,829
Current liabilities	(2,455)	(374)
Operating lease liabilities, less current portion	0	(8,352)
Fair value of assets acquired and liabilities assumed	19,285	56,675
Excess purchase price allocated to goodwill	73,471	46,823
Accounts receivable	3,033	5,270
Waste Collection Acquisitions | Trade Names
Allocated as follows:
Intangible assets	0	304
Waste Collection Acquisitions | Covenants Not-to-Compete
Allocated as follows:
Intangible assets	0	1,779
Waste Collection Acquisitions | Customer Relationships
Allocated as follows:
Intangible assets	$ 0	$ 23,447