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Acquisitions and Dispositions - Acquisitions Narrative (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 06, 2020 | Jun. 28, 2019 | Jan. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total revenues |  |  |  | $ 447,281,000 | $ 350,898,000 | $ 846,122,000 | $ 680,800,000 |  |
Operating income from continuing operations |  |  |  | 1,868,000 | 17,799,000 | 4,749,000 | 37,623,000 | $ 37,623,000 |
Additional interest expense |  |  |  | 14,953,000 | 6,103,000 | 27,602,000 | 11,610,000 |  |
Receivable with Imputed Interest, Face Amount |  |  |  | 40,000,000 |  | 40,000,000 |  |  |
Receivables, Fair Value Disclosure |  |  | $ 34,300,000 | 34,700,000 |  | 34,700,000 |  |  | $ 34,300,000
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  | 18,400,000 | (91,000) | 0 | 18,371,000 | 0 |  |
Stericycle [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Corporate charge |  |  |  |  | 8,900,000 | 8,900,000 | 17,800,000 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Harsco Industrial IKG [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Selling price |  |  |  |  |  |  |  |  | $ 85,000,000
Receivable with Imputed Interest, Face Amount |  |  | 40,000,000.0 |  |  |  |  |  |
Disposal Group, Net Gain on Disposal |  |  | $ 9,000,000 |  |  |  |  |  |
Discontinued Operations, Held-for-sale | Harsco Industrial |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Corporate overhead expenses |  |  |  |  | 1,400,000 |  | 2,800,000 |  |
Harsco Clean Earth Segment |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interests acquired |  | 100.00% |  |  |  |  |  |  |
Enterprise valuation |  | $ 625,000,000 |  |  |  |  |  |  |
Cash consideration |  | 628,000,000 |  |  |  |  |  |  |
Goodwill to be deductible for income tax purposes |  | 16,300,000 |  |  |  |  |  |  |
Direct acquisition costs |  |  |  |  | 12,000,000.0 |  | 12,500,000 |  |
Estimated reimbursements |  | 8,000,000 |  |  |  |  |  |  |
ESOL |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interests acquired | 100.00% |  |  |  |  |  |  |  |
Cash consideration | $ 438,800,000 | $ 462,500,000 |  |  |  |  |  |  |
Goodwill to be deductible for income tax purposes |  |  |  | 36,800,000 |  | 36,800,000 |  |  |
Total revenues |  |  |  | 107,500,000 |  | 107,500,000 |  |  |
Operating income from continuing operations |  |  |  | 1,900,000 |  | 1,900,000 |  |  |
Direct acquisition costs |  |  |  | $ 17,200,000 |  | 30,300,000 |  |  |
Clean Earth and ESOL |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Additional interest expense |  |  |  |  | $ 14,800,000 | $ 4,700,000 | $ 29,400,000 |  |

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