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Acquisitions and Dispositions - Narrative (Details) $ in Thousands, £ in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 28, 2019 USD ($) facility | Jun. 28, 2019 USD ($) facility | Jun. 28, 2019 USD ($) facility permit | Jun. 28, 2019 USD ($) facility | Jun. 28, 2019 USD ($) facility TSDF_permits | Jun. 28, 2019 USD ($) facility RCRA_permits | Jan. 31, 2020 USD ($) | Nov. 30, 2019 USD ($) | May 31, 2018 GBP (£) | May 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jul. 01, 2019 USD ($) | May 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Permits Acquired | permit |  |  | 200 |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | $ (36,586) | $ (21,531) | $ (26,862) |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  |  |  |  |  | 623,495 | 56,389 | 0 |  |
Proceeds from Divestiture of Businesses |  |  |  |  |  |  |  |  |  |  | 658,414 | 0 | 0 |  |
Clean Earth |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  | $ 625,000 |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  | 628,000 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Post-Closing Period | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated preliminary fair value | $ 8,000 | $ 8,000 | $ 8,000 | $ 8,000 | $ 8,000 | $ 8,000 |  |  |  |  |  |  |  |  |
Number of Stores | facility | 27 | 27 | 27 | 27 | 27 | 27 |  |  |  |  |  |  |  |  |
Number Of Permits Acquired |  | 1 |  |  | 6 | 9 |  |  |  |  |  |  |  |  |
Tax deductible Goodwill (less than) | $ 16,300 | $ 16,300 | $ 16,300 | $ 16,300 | $ 16,300 | $ 16,300 |  |  |  |  |  |  |  |  |
Costs associated with the acquisition |  |  |  |  |  |  |  |  |  |  | 15,200 |  |  |  |
Altek |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  | $ 57,400 |  |  |  |  |
Estimated preliminary fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,100
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  |  |  | £ 45 | $ 60,000 |  |  |  |  |
Additional contingent consideration |  |  |  |  |  |  |  |  | £ 25 |  |  |  |  |  | $ 33,000
Harsco Industrial | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Corporate Overhead |  |  |  |  |  |  |  |  |  |  | 4,000 | 5,600 | $ 5,600 |  |
Harsco Industrial Patterson-Kelley [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Net Gain on Disposal, After Tax |  |  |  |  |  |  |  | $ 41,200 |  |  |  |  |  |  |
Disposal Group, Net Gain on Disposal |  |  |  |  |  |  |  | 33,000 |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  |  |  |  |  |  |  | $ 60,000 |  |  |  |  |  |  |
Harsco Industrial Air-X-Changers Business [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 |
Disposal Group, Net Gain on Disposal, After Tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 527,900 |
Disposal Group, Net Gain on Disposal |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 421,000 |
Subsequent Event [Member] | Harsco Industrial IKG [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  |  |  |  |  |  | $ 85,000 |  |  |  |  |  |  |  |
Acquisition-related Costs [Member] | Clean Earth |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | $ (18,000) | $ (36,000) |  |  |

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