REVENUES (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Disaggregation of revenue
Number of reportable segments | segment	3
Revenue	$ 988,001	$ 933,854	$ 685,509
Treatment and disposal
Disaggregation of revenue
Revenue	443,528	420,720	384,409
Transportation and Logistics
Disaggregation of revenue
Revenue	117,119	112,760	124,247
Industrial Services
Disaggregation of revenue
Revenue	124,171	122,762	40,061
Small Quantity Generation
Disaggregation of revenue
Revenue	55,158	48,049	37,471
Total Waste Management
Disaggregation of revenue
Revenue	39,949	35,401	33,794
Remediation
Disaggregation of revenue
Revenue	48,224	30,225	13,307
Emergency Response
Disaggregation of revenue
Revenue	138,443	140,253	41,088
Other Services
Disaggregation of revenue
Revenue	21,409	23,684	11,132
Operating Segment
Disaggregation of revenue
Revenue	988,001	933,854	685,509
Operating Segment | Environmental Services
Disaggregation of revenue
Revenue	451,249	425,413	440,547
Operating Segment | Field & Industrial Services
Disaggregation of revenue
Revenue	500,187	473,754	232,402
Operating Segment | Energy Waste
Disaggregation of revenue
Revenue	36,565	34,687	12,560
Operating Segment | Treatment and disposal | Environmental Services
Disaggregation of revenue
Revenue	372,204	354,055	359,847
Operating Segment | Treatment and disposal | Field & Industrial Services
Disaggregation of revenue
Revenue	50,327	47,781	18,523
Operating Segment | Treatment and disposal | Energy Waste
Disaggregation of revenue
Revenue	20,997	18,884	6,039
Operating Segment | Transportation and Logistics | Environmental Services
Disaggregation of revenue
Revenue	79,045	71,358	80,700
Operating Segment | Transportation and Logistics | Field & Industrial Services
Disaggregation of revenue
Revenue	29,096	34,218	40,670
Operating Segment | Transportation and Logistics | Energy Waste
Disaggregation of revenue
Revenue	8,978	7,184	2,877
Operating Segment | Industrial Services | Field & Industrial Services
Disaggregation of revenue
Revenue	121,357	118,584	38,861
Operating Segment | Industrial Services | Energy Waste
Disaggregation of revenue
Revenue	2,814	4,178	1,200
Operating Segment | Small Quantity Generation | Field & Industrial Services
Disaggregation of revenue
Revenue	55,158	48,049	37,471
Operating Segment | Total Waste Management | Field & Industrial Services
Disaggregation of revenue
Revenue	39,949	35,401	33,794
Operating Segment | Remediation | Field & Industrial Services
Disaggregation of revenue
Revenue	48,224	30,225	13,307
Operating Segment | Emergency Response | Field & Industrial Services
Disaggregation of revenue
Revenue	138,425	140,253	41,088
Operating Segment | Emergency Response | Energy Waste
Disaggregation of revenue
Revenue	18
Operating Segment | Other Services | Field & Industrial Services
Disaggregation of revenue
Revenue	17,651	19,243	8,688
Operating Segment | Other Services | Energy Waste
Disaggregation of revenue
Revenue	$ 3,758	$ 4,441	$ 2,444