Revenues and Accounts Receivable - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Contracts assets acquired through business acquisitions	$ 6,500,000		$ 6,500,000		$ 700,000
Contract liabilities acquired through business acquisitions	0		0		2,200,000
Contract with customer, liability, revenue recognized	300,000		1,600,000
Revenue remaining performance obligations	$ 15,300,000		15,300,000		13,000,000
Provision for bad debt		$ 6,300,000	6,263,000	$ 547,000	$ 1,246,000
Remediation and Reuse Segment
Accounts Notes And Loans Receivable [Line Items]
Provision for bad debt			$ 5,500,000
Customer Concentration Risk | Accounts Receivable | Minimum
Accounts Notes And Loans Receivable [Line Items]
Concentration Risk Percentage			10.00%