CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (8,590)	$ (38,680)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of deferred income taxes	12,446	(2,847)
Net gain (loss) on cash flow hedging instruments, net of deferred income taxes	(2,560)	1,140
Pension liability adjustments, net of deferred income taxes	(2,735)	13,718
Unrealized gain (loss) on marketable securities, net of deferred income taxes	1	(3)
Total other comprehensive income (loss)	7,152	12,008
Total comprehensive income (loss)	(1,438)	(26,672)
Less: Comprehensive (income) loss attributable to noncontrolling interests	(1,293)	(677)
Comprehensive income (loss) attributable to Harsco Corporation	$ (2,731)	$ (27,349)