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Revenue Recognition
 3 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenues
The Company recognizes revenues to depict the transfer of promised services and products to customers in an amount that reflects the consideration the Company expects to receive in exchange for those services and products. Service revenues include CE and the service components of HE and Rail. Product revenues include portions of HE and Rail.

A summary of the Company's revenues by primary geographical markets as well as by key product and service groups is as follows:
Three Months Ended
March 31, 2024
(In thousands)
Harsco
Environmental
Segment
Clean Earth
Segment		Harsco
Rail
Segment		Consolidated Totals
Primary Geographical Markets (a):
North America$84,210 $226,030 $44,431 $354,671 
Western Europe110,275 — 21,372 131,647 
Latin America (b)
42,921 — 1,040 43,961 
Asia-Pacific28,915 — 8,325 37,240 
Middle East and Africa28,349 — — 28,349 
Eastern Europe 4,449 — — 4,449 
Total Revenues $299,119 $226,030 $75,168 $600,317 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing and related logistical services$258,128 $— $— $258,128 
Ecoproducts36,264 — — 36,264 
Environmental systems for aluminum dross and scrap processing4,727 — — 4,727 
Railway track maintenance equipment— — 29,918 29,918 
After-market parts and services; safety and diagnostic technology
— — 30,876 30,876 
Railway contracting services— — 14,374 14,374 
Hazardous waste processing solutions— 191,910 — 191,910 
Soil and dredged materials processing and reuse solutions— 34,120 — 34,120 
Total Revenues$299,119 $226,030 $75,168 $600,317 
Three Months Ended
March 31, 2023
(In thousands)
Harsco
Environmental
Segment

Clean Earth
Segment		Harsco
Rail
Segment		Consolidated Totals
Primary Geographical Markets (a):
North America$78,473 $222,464 $44,162 $345,099 
Western Europe101,386 — 13,187 114,573 
Latin America (b)
40,955 — 604 41,559 
Asia-Pacific28,961 — 7,099 36,060 
Middle East and Africa18,405 — — 18,405 
Eastern Europe 5,009 — — 5,009 
Total Revenues$273,189 $222,464 $65,052 $560,705 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing and related logistical services$229,361 $— $— $229,361 
Ecoproducts38,402 — — 38,402 
Environmental systems for aluminum dross and scrap processing5,426 — — 5,426 
Railway track maintenance equipment— — 29,444 29,444 
After-market parts and services; safety and diagnostic technology
— — 27,793 27,793 
Railway contracting services— — 7,815 7,815 
Hazardous waste processing solutions— 186,112 — 186,112 
Soil and dredged materials processing and reuse solutions— 36,352 — 36,352 
Total Revenues$273,189 $222,464 $65,052 $560,705 
(a)     Revenues are attributed to individual countries based on the location of the facility generating the revenue.
(b)     Includes Mexico.

The Company may receive payments in advance of earning revenue (advances on contracts), which are included in Current portion of advances on contracts and Other liabilities on the Condensed Consolidated Balance Sheets. The Company may recognize revenue in advance of being able to contractually invoice the customer (contract assets), which is included in Current portion of contract assets and Other assets on the Condensed Consolidated Balance Sheets. Contract assets are transferred to Trade accounts receivable, net, when the right to payment becomes unconditional. Contract assets and advances on contracts are reported as a net position, on a contract-by-contract basis, at the end of each reporting period. These instances are primarily related to Rail.

The Company had contract assets totaling $95.8 million and $86.9 million at March 31, 2024 and December 31, 2023, respectively. The Company had advances on contracts totaling $36.2 million and $38.6 million at March 31, 2024 and December 31, 2023, respectively. During the three months ended March 31, 2024, the Company recognized $10.7 million of revenue related to amounts previously included in advances on contracts. During the three months ended March 31, 2023, the Company recognized $11.6 million of revenue related to amounts previously included in advances on contracts.

At March 31, 2024, HE had remaining, fixed, unsatisfied performance obligations where the expected contract duration exceeds one year totaling $82.2 million. Of this amount, $21.8 million is expected to be fulfilled by March 31, 2025, $20.5 million by March 31, 2026, $15.0 million by March 31, 2027, $12.4 million by March 31, 2028 and the remainder thereafter. These amounts exclude any variable fees, fixed fees subject to indexation and any performance obligations expected to be satisfied within one year.

At March 31, 2024, Rail had remaining, fixed, unsatisfied performance obligations where the expected contract duration exceeds one year totaling $140.7 million. Of this amount, $53.4 million is expected to be fulfilled by March 31, 2025, $61.0 million by March 31, 2026, $22.6 million by March 31, 2027, and $3.7 million by March 31, 2028. These amounts exclude any variable fees, fixed fees subject to indexation and any performance obligations expected to be satisfied within one year.
The Rail Segment is currently manufacturing highly-engineered equipment under large long-term fixed-price contracts with SBB, Network Rail, and Deutsche Bahn. As previously disclosed, the Company recognized estimated forward loss provisions in 2022 and 2023 related to these contracts due to several factors, such as material and labor cost inflation, supply chain delays, the bankruptcy of a key vendor and increased engineering efforts. No provisions related to these contracts were recognized in three months ended March 31, 2024 and 2023.
The estimated forward loss provisions represent the Company's best estimate based on currently available information. It is possible that the Company's overall estimate of liquidated damages, penalties and costs to complete these contracts may change, which could result in an additional estimated forward loss provision at such time that could be material. The Company will continue to update its estimates to complete these contracts, which will include the effect of negotiations with the customers regarding price increases, change orders and extensions to delivery schedules.

As of March 31, 2024, the contracts with Network Rail, Deutsche Bahn and the second contract with SBB are 59%, 43% and 88% complete, respectively based on costs incurred. The first contract with SBB has been completed.

The Company provides assurance type warranties primarily for product sales at Rail. These warranties are typically not priced or negotiated separately (there is no option to separately purchase the warranty) or the warranty does not provide customers with a service in addition to the assurance that the product complies with agreed-upon specifications. Accordingly, such warranties do not represent separate performance obligations.