GOODWILL AND INTANGIBLE ASSETS - Schedule of Goodwill Activity (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,120,056
Acquisitions	73,471
Business Combination Adjustments	573
Goodwill, ending balance	1,194,100
Eastern
Goodwill [Roll Forward]
Goodwill, beginning balance	110,533
Acquisitions	0
Business Combination Adjustments	0
Goodwill, ending balance	110,533
Western
Goodwill [Roll Forward]
Goodwill, beginning balance	371,035
Acquisitions	0
Business Combination Adjustments	573
Goodwill, ending balance	371,608
Mid-Atlantic
Goodwill [Roll Forward]
Goodwill, beginning balance	584,136
Acquisitions	73,471
Business Combination Adjustments	0
Goodwill, ending balance	657,607
Resource Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	54,352
Acquisitions	0
Business Combination Adjustments	0
Goodwill, ending balance	$ 54,352