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Acquisitions and Dispositions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | 18 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Apr. 06, 2020
Business Acquisition [Line Items] |  |  |
Goodwill | $ 896,728 | $ 902,074 |
Gross Carrying Amount | 521,424 | 523,048 |
Non-compete agreement |  |  |
Business Acquisition [Line Items] |  |  |
Gross Carrying Amount | 2,500 | 2,500 |
Harsco Clean Earth Segment |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | 483,879 | $ 482,647 |
Harsco Clean Earth Segment | ESOL |  |  |
Business Acquisition [Line Items] |  |  |
Cash and cash equivalents | 400 |  | $ 400
Trade accounts receivable | 122,600 |  | 124,100
Inventory | 5,000 |  | 5,000
Other current assets | 0 |  | 700
Property, plant and equipment | 101,400 |  | 105,300
Right-of-use assets | 56,000 |  | 56,000
Goodwill | 153,300 |  | 152,000
Intangible assets | 161,000 |  | 161,000
Other assets | 200 |  | 200
Accounts payable | (50,100) |  | (48,600)
Accrued expenses | (19,300) |  | (17,500)
Current portion of operating lease liabilities | (16,600) |  | (16,600)
Other current liabilities | (6,600) |  | (6,400)
Environmental liabilities | (24,400) |  | (24,400)
Deferred income taxes | (17,000) |  | (15,500)
Operating lease liabilities | (39,400) |  | (39,400)
Total identifiable net assets of ESOL | 426,500 |  | 436,300
Gross Carrying Amount | 2,500 |  | 2,500
Business Acquisitions, Purchase Price Allocation | 429,000 |  | $ 438,800
Measurement Period Adjustments |  |  |
Cash and cash equivalents | 0 |  |
Trade accounts receivable | (1,500) |  |
Inventory | 0 |  |
Other current assets | (700) |  |
Property, plant and equipment | (3,900) |  |
Right-of-use assets | 0 |  |
Goodwill | 1,300 |  |
Intangible assets | 0 |  |
Other assets | 0 |  |
Accounts payable | (1,500) |  |
Current portion of operating lease liabilities | (1,800) |  |
Current portion of operating lease liabilities | 0 |  |
Other current liabilities | (200) |  |
Environmental liabilities | 0 |  |
Deferred income taxes | (1,500) |  |
Operating lease liabilities | 0 |  |
Total identifiable net assets of ESOL | (9,800) |  |
Total identifiable net assets of ESOL, including non-compete agreement | (9,800) |  |
Harsco Clean Earth Segment | ESOL | Non-compete agreement |  |  |
Measurement Period Adjustments |  |  |
Intangible assets | $ 0 |  |

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