Revenue (Tables)

9 Months Ended

Sep. 30, 2020

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

We disaggregate our revenue from customers by type of service and by geographic region as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. See details in the tables below.

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Environmental Solutions
Product sales	$	22,940	$	28,995	$	66,101	$	76,397
Construction contracts	21,590		16,841		51,784		63,048
Services	1,270		177		2,442		1,901
Total Environmental Solutions	45,800		46,013		120,327		141,346
Maintenance and Technical Services
Services	72,915		75,100		296,164		263,961
Total Maintenance and Technical Services	72,915		75,100		296,164		263,961
Total revenue	$	118,715	$	121,113	$	416,491	$	405,307

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Environmental Solutions
United States	$	45,729	$	46,013	$	119,410	$	141,346
Foreign	71		—		917		—
Total Environmental Solutions	45,800		46,013		120,327		141,346
Maintenance and Technical Services
United States	72,915		75,100		296,164		263,961
Total Maintenance and Technical Services	72,915		75,100		296,164		263,961
Total revenue	$	118,715	$	121,113	$	416,491	$	405,307