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Acquisitions and Dispositions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Apr. 06, 2020 | Dec. 31, 2019 | Jun. 28, 2019
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 881,665 | $ 881,665 |  | $ 738,369 |
Gross Carrying Amount | 574,570 | 574,570 |  | 412,657 |
Noncompete Agreements |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Gross Carrying Amount | 2,500 | 2,500 |  | 0 |
Harsco Clean Earth Segment |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents | 3,600 | 3,600 |  |  |
Trade accounts receivable, net | 62,500 | 62,500 |  |  |
Other receivables | 2,100 | 2,100 |  |  |
Other current assets | 7,300 | 7,300 |  |  |
Property, plant and equipment | 77,000 | 77,000 |  |  |
Right-of-use assets | 25,800 | 25,800 |  |  |
Goodwill | 330,600 | 330,600 |  |  |
Intangible assets | 242,200 | 242,200 |  |  | $ 261,100
Other assets | 1,200 | 1,200 |  |  |
Accounts payable | (23,100) | (23,100) |  |  |
Other current liabilities | (19,700) | (19,700) |  |  |
Deferred income taxes | (45,700) | (45,700) |  |  |
Operating lease liabilities | (19,500) | (19,500) |  |  |
Total identifiable net assets of Clean Earth | 635,700 | 635,700 |  |  | 635,900
Acquisition consideration payable (b) | 0 | 0 |  |  |
Other liabilities | (8,600) | (8,600) |  |  |
Harsco Clean Earth Segment |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | 482,530 | 482,530 |  | $ 330,230 |
Measurement Period Adjustments |  |  |  |  |
Intangible assets |  | (18,900) |  |  |
Total identifiable intangible assets of Clean Earth |  | 200 |  |  |
Harsco Clean Earth Segment | ESOL |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents | 400 | 400 | $ 400 |  |
Trade accounts receivable, net | 124,100 | 124,100 | 124,100 |  |
Inventory | 5,000 | 5,000 | 5,000 |  |
Other current assets | 700 | 700 | 700 |  |
Property, plant and equipment | 105,300 | 105,300 | 105,300 |  |
Right-of-use assets | 56,000 | 56,000 | 56,000 |  |
Goodwill | 152,000 | 152,000 | 152,000 |  |
Intangible assets | 161,000 | 161,000 | 161,000 |  |
Other assets | 200 | 200 | 200 |  |
Accounts payable | 48,600 | 48,600 | 48,600 |  |
Accrued expenses | (17,500) | (17,500) | (17,500) |  |
Current portion of operating lease liabilities | (16,600) | (16,600) | (16,600) |  |
Other current liabilities | 6,400 | 6,400 | 6,400 |  |
Environmental liabilities | (24,400) | (24,400) | (24,400) |  |
Deferred income taxes | (15,500) | (15,500) | 15,500 |  |
Operating lease liabilities | 39,400 | 39,400 | 39,400 |  |
Total identifiable net assets of Clean Earth | 436,300 | 436,300 | 436,300 |  |
Gross Carrying Amount | 2,500 | 2,500 | 2,500 |  |
Business Acquisitions, Purchase Price Allocation | 438,800 | 438,800 | $ 438,800 |  |
Measurement Period Adjustments |  |  |  |  |
Cash and cash equivalents | 0 |  |  |  |
Trade accounts receivable | 0 |  |  |  |
Inventory | 0 |  |  |  |
Other current assets | 0 |  |  |  |
Property, plant and equipment | 0 |  |  |  |
Right-of-use assets | 0 |  |  |  |
Goodwill | 0 |  |  |  |
Intangible assets | 0 |  |  |  |
Other assets | 0 |  |  |  |
Accounts payable | 0 |  |  |  |
Current portion of operating lease liabilities | 0 |  |  |  |
Current portion of operating lease liabilities | 0 |  |  |  |
Other current liabilities | 0 |  |  |  |
Environmental liabilities | 0 |  |  |  |
Deferred income taxes | 0 |  |  |  |
Operating lease liabilities | 0 |  |  |  |
Total identifiable intangible assets of Clean Earth | 0 |  |  |  |
Total identifiable net assets of ESOL | 0 |  |  |  |
Harsco Clean Earth Segment | ESOL | Noncompete Agreements |  |  |  |  |
Measurement Period Adjustments |  |  |  |  |
Intangible assets | $ 0 |  |  |  |
Harsco Clean Earth Segment | Harsco Clean Earth Segment |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 42,800
Trade accounts receivable, net |  |  |  |  | 63,700
Other receivables |  |  |  |  | 800
Other current assets |  |  |  |  | 8,700
Property, plant and equipment |  |  |  |  | 75,600
Right-of-use assets |  |  |  |  | 14,400
Goodwill |  |  |  |  | 313,800
Intangible assets |  |  |  |  | 261,100
Other assets |  |  |  |  | 4,000
Accounts payable |  |  |  |  | (23,000)
Other current liabilities |  |  |  |  | (18,000)
Deferred income taxes |  |  |  |  | (51,200)
Operating lease liabilities |  |  |  |  | (11,100)
Acquisition consideration payable (b) |  |  |  |  | (39,200)
Other liabilities |  |  |  |  | $ (6,500)
Measurement Period Adjustments |  |  |  |  |
Cash and cash equivalents |  | (39,200) |  |  |
Trade accounts receivable |  | (1,200) |  |  |
Other current assets |  | (1,400) |  |  |
Property, plant and equipment |  | 1,400 |  |  |
Right-of-use assets |  | 11,400 |  |  |
Goodwill |  | 16,800 |  |  |
Intangible assets |  | (18,900) |  |  |
Other assets |  | (2,800) |  |  |
Accounts payable |  | (100) |  |  |
Other current liabilities |  | (1,700) |  |  |
Deferred income taxes |  | 5,500 |  |  |
Operating lease liabilities |  | (8,400) |  |  |
Other receivables |  | 1,300 |  |  |
Acquisition consideration payable (b) |  | 39,200 |  |  |
Other liabilities |  | $ (2,100) |  |  |

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