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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 172,832	$ 485,936
Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8,935	24,877
Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	163,897	461,059
Collection
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	80,844	223,348
Landfill
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	27,100	71,683
Transfer
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	18,291	50,212
Customer solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17,195	48,315
Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	11,757	33,904
Organics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	13,413	40,259
Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,312	14,200
Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	920	4,015
Eastern
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	56,006	154,099
Eastern | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	128	500
Eastern | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	55,878	153,599
Eastern | Collection
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	36,392	101,544
Eastern | Landfill
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8,336	22,179
Eastern | Transfer
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	11,001	29,305
Eastern | Customer solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Eastern | Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5	0
Eastern | Organics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Eastern | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Eastern | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	272	1,071
Western
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	74,425	210,208
Western | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	233	847
Western | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	74,192	209,361
Western | Collection
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	44,452	121,804
Western | Landfill
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	18,764	49,504
Western | Transfer
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,290	20,907
Western | Customer solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Western | Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	875	3,270
Western | Organics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Western | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,396	11,779
Western | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	648	2,944
Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,877	30,634
Recycling | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,436	20,311
Recycling | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,441	10,323
Recycling | Collection
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Recycling | Landfill
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Recycling | Transfer
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Recycling | Customer solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Recycling | Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,877	30,634
Recycling | Organics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Recycling | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Recycling | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	31,524	90,995
Other | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,138	3,219
Other | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	30,386	87,776
Other | Collection
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Other | Landfill
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Other | Transfer
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Other | Customer solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17,195	48,315
Other | Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Other | Organics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	13,413	40,259
Other | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	916	2,421
Other | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	$ 0

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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