ORGANIZATION AND BASIS OF PRESENTATION - Reclassification (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Organization And Summary Of Significant Accounting Policies [Line Items]
Total operating revenue	$ 498,000	$ 468,000
Cost of operations	398,000	371,000
Other operating expense, net	(4,000)	2,000
General and administrative expense	33,000	30,000
Depreciation and amortization expense	57,000	58,000
Impairment charges	0	19,000
Total operating expense	484,000	480,000
Operating income (loss)	14,000	(12,000)
Waste revenue
Organization And Summary Of Significant Accounting Policies [Line Items]
Total operating revenue	343,000	340,000
Energy revenue
Organization And Summary Of Significant Accounting Policies [Line Items]
Total operating revenue	104,000	93,000
Materials sales revenue
Organization And Summary Of Significant Accounting Policies [Line Items]
Total operating revenue	36,000	17,000
Services revenue
Organization And Summary Of Significant Accounting Policies [Line Items]
Total operating revenue	$ 15,000	18,000
Previously Reported
Organization And Summary Of Significant Accounting Policies [Line Items]
Total operating revenue		468,000
Cost of operations		361,000
Other operating expense, net		12,000
General and administrative expense		30,000
Depreciation and amortization expense		58,000
Impairment charges		19,000
Total operating expense		480,000
Operating income (loss)		(12,000)
Previously Reported | Waste revenue
Organization And Summary Of Significant Accounting Policies [Line Items]
Total operating revenue		346,000
Previously Reported | Energy revenue
Organization And Summary Of Significant Accounting Policies [Line Items]
Total operating revenue		93,000
Previously Reported | Materials sales revenue
Organization And Summary Of Significant Accounting Policies [Line Items]
Total operating revenue		17,000
Previously Reported | Services revenue
Organization And Summary Of Significant Accounting Policies [Line Items]
Total operating revenue		12,000
Reclassifications
Organization And Summary Of Significant Accounting Policies [Line Items]
Total operating revenue		0
Cost of operations		10,000
Other operating expense, net		(10,000)
General and administrative expense		0
Depreciation and amortization expense		0
Impairment charges		0
Total operating expense		0
Operating income (loss)		0
Reclassifications | Waste revenue
Organization And Summary Of Significant Accounting Policies [Line Items]
Total operating revenue		(6,000)
Reclassifications | Energy revenue
Organization And Summary Of Significant Accounting Policies [Line Items]
Total operating revenue		0
Reclassifications | Materials sales revenue
Organization And Summary Of Significant Accounting Policies [Line Items]
Total operating revenue		0
Reclassifications | Services revenue
Organization And Summary Of Significant Accounting Policies [Line Items]
Total operating revenue		$ 6,000