CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2,881	$ 9,828	$ (140,295)	$ 26,473
Other comprehensive income (loss):
Foreign currency translation adjustments, net of deferred income taxes	(54,914)	(27,587)	(116,407)	(15,437)
Net gain (loss) on cash flow hedging instruments, net of deferred income taxes	1,143	822	3,003	1,745
Pension liability adjustments, net of deferred income taxes	28,163	17,768	70,691	23,812
Unrealized gain (loss) on marketable securities, net of deferred income taxes	(7)	0	(20)	25
Total other comprehensive income (loss)	(25,615)	(8,997)	(42,733)	10,145
Total comprehensive income (loss)	(22,734)	831	(183,028)	36,618
Less: Comprehensive (income) loss attributable to noncontrolling interests	1,921	(1,820)	3,052	(4,549)
Comprehensive income (loss) attributable to Harsco Corporation	$ (20,813)	$ (989)	$ (179,976)	$ 32,069