CLOSURE AND POST-CLOSURE LIABILITIES - Changes in Post-Closure Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Changes to post-closure liabilities
Balance at the beginning of the period	$ 118,600	$ 118,801
Liabilities assumed in acquisitions	11,421	574
Measurement period adjustments from prior period acquisitions		3,015
New asset retirement obligations	2,118	3,092
Accretion	9,558	9,477
Changes in estimates recorded to consolidated statement of operations	(225)	1,200
Changes in estimates recorded to consolidated balance sheet	4,737	(2,106)
Environmental expenditures	(15,676)	(15,684)
Currency translation and other	(745)	231
Balance at the end of the period	129,788	118,600
Landfill Retirement Liability
Changes to post-closure liabilities
Balance at the beginning of the period	59,443	62,251
Liabilities assumed in acquisitions	0	0
Measurement period adjustments from prior period acquisitions		0
New asset retirement obligations	2,118	3,092
Accretion	5,069	4,958
Changes in estimates recorded to consolidated statement of operations	70	1,147
Changes in estimates recorded to consolidated balance sheet	4,335	(3,706)
Environmental expenditures	(11,210)	(8,478)
Currency translation and other	(425)	179
Balance at the end of the period	59,400	59,443
Non-Landfill Retirement Liability
Changes to post-closure liabilities
Balance at the beginning of the period	59,157	56,550
Liabilities assumed in acquisitions	11,421	574
Measurement period adjustments from prior period acquisitions		3,015
New asset retirement obligations	0	0
Accretion	4,489	4,519
Changes in estimates recorded to consolidated statement of operations	(295)	53
Changes in estimates recorded to consolidated balance sheet	402	1,600
Environmental expenditures	(4,466)	(7,206)
Currency translation and other	(320)	52
Balance at the end of the period	$ 70,388	$ 59,157