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REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 200,240	$ 202,667	$ 188,767	$ 182,910	$ 193,619	$ 198,547	$ 187,459	$ 163,664	$ 774,584	$ 743,290	$ 660,660
Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									220,285	219,475	206,473
Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									357,989	345,212	290,358
Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									196,310	178,603	163,829
Collection
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									397,555	377,839	306,939
Collection | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									153,815	154,805	136,661
Collection | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									243,740	223,034	170,278
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									85,529	93,019	94,986
Landfill | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									20,696	19,362	28,419
Landfill | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									64,833	73,657	66,567
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									78,917	76,138	67,583
Transfer | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									44,751	44,413	39,991
Transfer | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									34,166	31,725	27,592
Transfer | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									0	0	0
Customer solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									86,680	79,457	67,464
Customer solutions | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									0	0	0
Customer solutions | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									0	0	0
Customer solutions | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									86,680	79,457	67,464
Recycling
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									51,495	44,311	46,019
Recycling | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									8	5	5
Recycling | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									1,251	1,486	3,823
Recycling | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									50,236	42,820	42,191
Organics
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									59,394	56,326	54,174
Organics | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									0	0	0
Organics | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									0	0	0
Organics | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									59,394	56,326	54,174
Transportation
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									10,942	12,624	18,366
Transportation | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									0	0	0
Transportation | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									10,942	12,624	18,366
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									4,072	3,576	5,129
Landfill gas-to-energy | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									1,015	890	1,397
Landfill gas-to-energy | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									3,057	2,686	3,732
Landfill gas-to-energy | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									0	0	0
Transferred at a point-in-time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									31,328	24,286	32,974
Transferred at a point-in-time | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									223	159	648
Transferred at a point-in-time | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									1,484	921	1,145
Transferred at a point-in-time | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									29,621	23,206	31,181
Transferred over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									743,256	719,004	627,686
Transferred over time | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									220,062	219,316	205,825
Transferred over time | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									356,505	344,291	289,213
Transferred over time | Resource Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues									$ 166,689	$ 155,397	$ 132,648

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