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REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 660,660	$ 599,309	$ 565,030
Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	206,473
Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	286,262
Recycling
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	42,191
Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	125,734
Collection
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	306,939
Collection | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	136,661
Collection | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	170,278
Collection | Recycling
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Collection | Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Landfill
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	94,986
Landfill | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	28,419
Landfill | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	66,567
Landfill | Recycling
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Landfill | Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Transfer
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	67,583
Transfer | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	39,991
Transfer | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	27,592
Transfer | Recycling
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Transfer | Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Customer solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	67,464
Customer solutions | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Customer solutions | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Customer solutions | Recycling
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Customer solutions | Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	67,464
Recycling
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	46,019
Recycling | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	5
Recycling | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	3,823
Recycling | Recycling
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	42,191
Recycling | Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Organics
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	54,174
Organics | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Organics | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Organics | Recycling
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Organics | Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	54,174
Transportation
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	18,366
Transportation | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Transportation | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	14,270
Transportation | Recycling
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Transportation | Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	4,096
Landfill gas-to-energy
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	5,129
Landfill gas-to-energy | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	1,397
Landfill gas-to-energy | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	3,732
Landfill gas-to-energy | Recycling
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Landfill gas-to-energy | Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	0
Transferred at a point-in-time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	32,974
Transferred at a point-in-time | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	648
Transferred at a point-in-time | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	1,145
Transferred at a point-in-time | Recycling
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	27,260
Transferred at a point-in-time | Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	3,921
Transferred over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	627,686
Transferred over time | Eastern
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	205,825
Transferred over time | Western
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	285,117
Transferred over time | Recycling
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	14,931
Transferred over time | Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenues	$ 121,813

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+ 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
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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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