Accounts Receivable - Schedule of Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Apr. 06, 2020	Jan. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Receivables [Abstract]
Receivables, Fair Value Disclosure	$ 34,700		$ 34,300	$ 34,300
Receivable with Imputed Interest, Net Amount	34,977				$ 0
Trade accounts receivable	413,638				323,502
Less: Allowance for expected credit losses and doubtful accounts (a) (b)	(7,073)				(13,512)
Trade accounts receivable, net	406,565				309,990
Other receivables	19,601				$ 21,265
ESOL | Harsco Clean Earth Segment
Receivables [Abstract]
Trade accounts receivable, net	124,100	$ 124,100
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable, net	$ 124,100	124,100
Accounts Receivable, Allowance for Credit Loss		$ 12,100