CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenues from continuing operations:
Revenues	$ 495,653	$ 452,797
Costs and expenses from continuing operations:
Cost of sales	400,688	377,019
Selling, general and administrative expenses	71,935	69,153
Research and development expenses	176	56
Other (income) expenses, net	(6,151)	(1,179)
Total costs and expenses	466,648	445,049
Operating income (loss) from continuing operations	29,005	7,748
Interest income	1,455	644
Interest expense	(24,328)	(15,092)
Facility fees and debt-related income (expense)	(2,363)	(532)
Defined benefit pension income (expense)	(5,335)	2,410
Income (loss) from continuing operations before income taxes and equity income	(1,566)	(4,822)
Income tax benefit (expense) from continuing operations	(6,923)	(1,221)
Equity income (loss) of unconsolidated entities, net	(133)	(131)
Income (loss) from continuing operations	(8,622)	(6,174)
Discontinued operations:
Income (loss) from discontinued businesses	619	(39,097)
Income tax benefit (expense) from discontinued businesses	(587)	6,591
Income (loss) from discontinued operations, net of tax	32	(32,506)
Net income (loss)	(8,590)	(38,680)
Less: Net (income) loss attributable to noncontrolling interests	(935)	(1,159)
Net income (loss) attributable to Harsco Corporation	(9,525)	(39,839)
Amounts attributable to Harsco Corporation common stockholders:
Income (loss) from continuing operations, net of tax	(9,557)	(7,333)
Income (loss) from discontinued operations, net of tax	32	(32,506)
Net income (loss) attributable to Harsco Corporation	$ (9,525)	$ (39,839)
Weighted-average shares of common stock outstanding (in shares)	79,633	79,363
Basic earnings (loss) per common share attributable to Harsco Corporation common stockholders:
Continuing operations (in dollars per share)	$ (0.12)	$ (0.09)
Discontinued operations (in dollars per share)	0.00	(0.41)
Basic earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	$ (0.12)	$ (0.50)
Diluted weighted-average shares of common stock outstanding (in shares)	79,633	79,363
Diluted earnings (loss) per common share attributable to Harsco Corporation common stockholders:
Continuing operations (in dollars per share)	$ (0.12)	$ (0.09)
Discontinued operations (in dollars per share)	0.00	(0.41)
Diluted earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	$ (0.12)	$ (0.50)