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REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 889,211	$ 774,584	$ 743,290
Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	264,569	220,285	219,475
Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	389,520	357,989	345,212
Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	235,122	196,310	178,603
Collection
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	442,685	391,438	372,041
Collection | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	175,816	147,698	149,165
Collection | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	266,869	243,740	222,876
Collection | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0	0	0
Landfill
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	91,973	85,549	93,019
Landfill | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	25,241	20,716	19,362
Landfill | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	66,732	64,833	73,657
Landfill | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0	0	0
Transfer
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	91,282	78,847	76,053
Transfer | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	53,882	44,730	44,413
Transfer | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	37,400	34,117	31,640
Transfer | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0	0	0
Transportation
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	13,730	11,150	12,823
Transportation | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	1,683	208	198
Transportation | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	12,047	10,942	12,625
Transportation | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0	0	0
Landfill gas-to-energy
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	5,138	4,072	3,576
Landfill gas-to-energy | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	1,052	1,015	890
Landfill gas-to-energy | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	4,086	3,057	2,686
Landfill gas-to-energy | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0	0	0
Processing
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	102,604	69,757	61,156
Processing | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	6,895	5,918	5,447
Processing | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	2,386	1,300	1,728
Processing | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	93,323	62,539	53,981
Non-processing
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	141,799	133,771	124,622
Non-processing | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0	0	0
Non-processing | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0	0	0
Non-processing | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	141,799	133,771	124,622
Transferred at a point-in-time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	65,551	31,328	24,286
Transferred at a point-in-time | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	166	223	159
Transferred at a point-in-time | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	1,719	1,484	921
Transferred at a point-in-time | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	63,666	29,621	23,206
Transferred over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	823,660	743,256	719,004
Transferred over time | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	264,403	220,062	219,316
Transferred over time | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	387,801	356,505	344,291
Transferred over time | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 171,456	$ 166,689	$ 155,397

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