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Nature of Business and Basis of Presentation (Details) - USD ($)
$ in Thousands
1 Months Ended
Jun. 18, 2018
Mar. 30, 2018
Nov. 30, 2018
Sep. 30, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]          
Contingent payments for acquisitions       $ 11,624 $ 11,481
SBC Materials International, Inc.          
Related Party Transaction [Line Items]          
Purchase price   $ 35      
Payment at closing   20      
Additional payment to be paid based on certain performance metrics   $ 15 $ 15    
Reduction in purchase price to be paid over time     $ 3,300    
Present value of future payments, discount rate       2.50%  
BCP          
Related Party Transaction [Line Items]          
Equity interest contributed in exchange for shares of stock (in shares) 17,514,745        
CEP Holdings, Inc.          
Related Party Transaction [Line Items]          
Equity interest contributed in exchange for shares of stock (in shares) 4,605,465        
Charah Management Holdings LLC          
Related Party Transaction [Line Items]          
Equity interest contributed in exchange for shares of stock (in shares) 907,113        
Allied Management Holdings, LLC          
Related Party Transaction [Line Items]          
Equity interest contributed in exchange for shares of stock (in shares) 409,075