CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (104,496)	$ 15,080	$ (143,176)	$ 16,645
Other comprehensive income (loss):
Foreign currency translation adjustments, net of deferred income taxes	(58,646)	15,446	(61,493)	12,150
Net loss on cash flow hedging instruments, net of deferred income taxes	720	234	1,860	923
Pension liability adjustments, net of deferred income taxes	28,810	2,225	42,528	6,044
Unrealized gain (loss) on marketable securities, net of deferred income taxes	(10)	8	(13)	25
Total other comprehensive income (loss)	(29,126)	17,913	(17,118)	19,142
Total comprehensive income (loss)	(133,622)	32,993	(160,294)	35,787
Less: Comprehensive (income) loss attributable to noncontrolling interests	1,808	(2,365)	1,131	(2,729)
Comprehensive income (loss) attributable to Harsco Corporation	$ (131,814)	$ 30,628	$ (159,163)	$ 33,058