Nature of Business and Basis of Presentation (Details) - shares		6 Months Ended
	Jun. 18, 2018	Jun. 17, 2018
Bernhard Capital Partners Management, LP (BCP) | Common Stock
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Equity interest contributed in exchange for shares of stock (in shares)	17,514,745
CEP Holdings, Inc. | Common Stock
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Equity interest contributed in exchange for shares of stock (in shares)	4,605,465
Charah Management Holdings LLC | Common Stock
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Equity interest contributed in exchange for shares of stock (in shares)	907,113
Allied Management Holdings, LLC | Common Stock
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Equity interest contributed in exchange for shares of stock (in shares)	409,075
Pro Forma
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Effective income tax rate		25.00%