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SEGMENT REPORTING - Summary of Revenues Attributable to Services Provided by Company (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue from External Customer [Line Items]
Revenues	$ 188,767	$ 187,459	$ 371,676	$ 351,123
Solid waste operations
Revenue from External Customer [Line Items]
Revenues	140,622	142,824	275,970	263,972
Collection
Revenue from External Customer [Line Items]
Revenues	94,008	92,066	188,584	175,145
Disposal
Revenue from External Customer [Line Items]
Revenues	43,746	48,139	82,371	84,194
Power generation
Revenue from External Customer [Line Items]
Revenues	918	711	1,944	1,847
Processing
Revenue from External Customer [Line Items]
Revenues	1,950	1,908	3,071	2,786
Resource solutions operations
Revenue from External Customer [Line Items]
Revenues	48,145	44,635	95,706	87,151
Organics
Revenue from External Customer [Line Items]
Revenues	15,419	14,905	30,351	28,501
Customer solutions
Revenue from External Customer [Line Items]
Revenues	20,239	19,216	41,902	37,370
Recycling
Revenue from External Customer [Line Items]
Revenues	$ 12,487	$ 10,514	$ 23,453	$ 21,280

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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