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REVENUE RECOGNITION - Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 147,455
Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8,172
Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	139,283
Collection
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	67,008
Landfill
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	20,500
Transfer
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	13,166
Customer solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	15,169
Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	11,105
Organics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,200
Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,509
Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,798
Eastern
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	44,505
Eastern | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	191
Eastern | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	44,314
Eastern | Collection
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	30,523
Eastern | Landfill
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,960
Eastern | Transfer
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,560
Eastern | Customer solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Eastern | Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Eastern | Organics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Eastern | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Eastern | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	462
Western
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	64,739
Western | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	367
Western | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	64,372
Western | Collection
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	36,485
Western | Landfill
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	14,540
Western | Transfer
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,606
Western | Customer solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Western | Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	948
Western | Organics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Western | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,824
Western | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,336
Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,157
Recycling | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,257
Recycling | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,900
Recycling | Collection
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Recycling | Landfill
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Recycling | Transfer
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Recycling | Customer solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Recycling | Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,157
Recycling | Organics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Recycling | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Recycling | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	28,054
Other | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	357
Other | Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	27,697
Other | Collection
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Other | Landfill
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Other | Transfer
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Other | Customer solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	15,169
Other | Recycling
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Other | Organics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,200
Other | Transportation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	685
Other | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 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
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-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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