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Acquisitions and Dispositions - Preliminary Valuation of Identifiable Intangible Assets and Amortization Periods (Details) - USD ($) $ in Thousands |  | 18 Months Ended |
--- | --- | --- | ---
Apr. 06, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | $ 521,424 | $ 523,048
Permits and rights |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | 308,998 | 308,705
Non-compete agreement |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | 2,500 | $ 2,500
ESOL | Permits and rights |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted-Average Amortization Period | 22 years |  |
Preliminary Valuation | $ 138,000 | 138,000 |
ESOL | Customer relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted-Average Amortization Period | 10 years |  |
Preliminary Valuation | $ 23,000 | 23,000 |
ESOL | Non-compete agreement |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted-Average Amortization Period | 4 years |  |
Harsco Clean Earth Segment | ESOL |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Preliminary Valuation | $ 161,000 | 161,000 |
Gross Carrying Amount | 2,500 | 2,500 |
Total identifiable intangible assets acquired | $ 163,500 | 163,500 |
Measurement Period Adjustments |  |  |
Intangible assets |  | 0 |
Harsco Clean Earth Segment | ESOL | Non-compete agreement |  |  |
Measurement Period Adjustments |  |  |
Permits and rights |  | 0 |
Customer relationships |  | 0 |
Intangible assets |  | 0 |
Total identifiable intangible assets acquired |  | $ 0 |

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