Equity Method Investments - Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Equity Method Investment, Summarized Financial Information, Assets [Abstract]
Receivable due from equity method investment	$ 130		$ 130		$ 108
Current assets	2,834		2,834		2,619
Noncurrent assets	451		451		508
Total assets	3,285		3,285		3,127
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]
Current liabilities	449		449		607
Equity of Charah	5,218		5,218		5,060
Equity of joint venture partner	(2,382)		(2,382)		(2,540)
Total liabilities and members’ equity	3,285		3,285		$ 3,127
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]
Revenues	2,533	$ 2,664	4,753	$ 5,029
Net income	1,325	1,397	2,433	2,572
Charah Solutions’ share of net income	$ 663	$ 699	$ 1,217	$ 1,286