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Acquisitions and Dispositions - Preliminary Valuation of Identifiable Intangible Assets and Amortization Periods (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 06, 2020 | Jun. 28, 2019 | Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount |  |  | $ 574,570 | $ 574,570 | $ 412,657
Permits |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount |  |  | 308,432 | 308,432 | 170,322
Noncompete Agreements |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount |  |  | 2,500 | 2,500 | 0
Air rights |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount |  |  | 26,139 | 26,139 | 26,139
Trade names |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount |  |  | 31,525 | 31,525 | $ 31,719
ESOL | Permits |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-Average Amortization Period | 22 years |  |  |  |
Preliminary Valuation | $ 138,000 |  | 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 | 23,000 |
ESOL | Noncompete Agreements |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-Average Amortization Period | 4 years |  |  |  |
Harsco Clean Earth Segment |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Preliminary Valuation |  | $ 261,100 | 242,200 | 242,200 |
Harsco Clean Earth Segment | Permits |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-Average Amortization Period |  | 18 years |  |  |
Preliminary Valuation |  | $ 176,100 | 170,100 | 170,100 |
Harsco Clean Earth Segment | Customer relationships |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-Average Amortization Period |  | 8 years |  |  |
Preliminary Valuation |  | $ 33,400 | 20,500 | 20,500 |
Harsco Clean Earth Segment | Air rights |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-Average Amortization Period |  | 27 years |  |  |
Preliminary Valuation |  | $ 25,600 | 25,600 | 25,600 |
Harsco Clean Earth Segment | Trade names |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-Average Amortization Period |  | 12 years |  |  |
Preliminary Valuation |  | $ 26,000 | 26,000 | 26,000 |
Harsco Clean Earth Segment |  |  |  |  |
Measurement Period Adjustments |  |  |  |  |
Permits and rights |  |  |  | (6,000) |
Customer relationships |  |  |  | (12,900) |
Intangible assets |  |  |  | (18,900) |
Air rights |  |  |  | 0 |
Trade names |  |  |  | 0 |
Harsco Clean Earth Segment | ESOL |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Preliminary Valuation | $ 161,000 |  | 161,000 | 161,000 |
Gross Carrying Amount | 2,500 |  | 2,500 | 2,500 |
Total identifiable intangible assets acquired | $ 163,500 |  | 163,500 | 163,500 |
Measurement Period Adjustments |  |  |  |  |
Intangible assets |  |  | 0 |  |
Harsco Clean Earth Segment | ESOL | Noncompete Agreements |  |  |  |  |
Measurement Period Adjustments |  |  |  |  |
Permits and rights |  |  | 0 |  |
Customer relationships |  |  | 0 |  |
Intangible assets |  |  | 0 |  |
Total identifiable intangible assets acquired |  |  | $ 0 |  |
Harsco Clean Earth Segment | Harsco Clean Earth Segment |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Preliminary Valuation |  | $ 261,100 |  |  |
Measurement Period Adjustments |  |  |  |  |
Intangible assets |  |  |  | $ (18,900) |

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