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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense (benefit) | $ 6,989 | $ (1,654) | $ 19,782 | $ (4,640)
Unrecognized income tax benefits including interest and penalties | 4,300 |  | 4,300 |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | $ 300 |  | $ 300 |
Harsco Clean Earth Segment |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating Loss Carryforwards |  | $ 2,800 |  | $ 2,800

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