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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 187,459	$ 165,649	$ 351,123	$ 313,104
Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,735	7,770	13,471	15,943
Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	180,724	157,879	337,652	297,161
Collection
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	93,106	75,494	176,665	142,502
Landfill
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	24,282	24,083	43,467	44,583
Transfer
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	20,520	18,756	34,781	31,921
Customer solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	19,216	15,950	37,370	31,119
Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	11,432	11,045	22,640	22,151
Organics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	14,905	14,647	28,501	26,847
Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,287	4,379	5,852	10,887
Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	711	1,295	1,847	3,094
Eastern
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	57,076	53,589	104,073	98,094
Eastern | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	52	181	88	372
Eastern | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	57,024	53,408	103,985	97,722
Eastern | Collection
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	38,955	34,625	72,919	65,149
Eastern | Landfill
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,427	7,883	9,144	13,843
Eastern | Transfer
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	11,923	10,745	20,909	18,304
Eastern | Customer solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Eastern | Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	577	0	578	0
Eastern | Organics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Eastern | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Eastern | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	194	336	523	798
Western
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	85,356	71,043	158,989	135,783
Western | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	178	246	487	614
Western | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	85,178	70,797	158,502	135,169
Western | Collection
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	54,151	40,869	103,746	77,353
Western | Landfill
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	18,855	16,200	34,323	30,740
Western | Transfer
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8,597	8,011	13,872	13,617
Western | Customer solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Western | Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	341	1,445	782	2,394
Western | Organics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Western | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,895	3,559	4,942	9,383
Western | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	517	959	1,324	2,296
Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,514	9,600	21,280	19,757
Recycling | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,051	5,618	11,175	12,875
Recycling | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,463	3,982	10,105	6,882
Recycling | Collection
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Recycling | Landfill
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Recycling | Transfer
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Recycling | Customer solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Recycling | Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,514	9,600	21,280	19,757
Recycling | Organics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Recycling | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Recycling | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	34,513	31,417	66,781	59,470
Other | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,454	1,725	1,721	2,082
Other | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	33,059	29,692	65,060	57,388
Other | Collection
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other | Landfill
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other | Transfer
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other | Customer solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	19,216	15,950	37,370	31,119
Other | Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other | Organics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	14,905	14,647	28,501	26,847
Other | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	392	820	910	1,504
Other | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	$ 0	$ 0	$ 0

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