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Revenue Recognition
 9 Months Ended
Sep. 30, 2025
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. There are no significant inter-segment sales.

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
September 30, 2025
(In thousands)
Harsco Environmental
Clean Earth
Harsco Rail
Consolidated Totals
Primary Geographical Markets (a):
North America$57,750 $250,051 $33,865 $341,666 
Western Europe101,108 — 22,216 123,324 
Latin America (b)
38,815 — 312 39,127 
Asia-Pacific31,971 — 7,240 39,211 
Middle East and Africa26,562 — — 26,562 
Eastern Europe 4,925 — — 4,925 
Total Revenues$261,131 $250,051 $63,633 $574,815 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing and related logistical services$241,417 $— $— $241,417 
Ecoproducts14,980 — — 14,980 
Environmental systems for aluminum dross and scrap processing4,734 — — 4,734 
Railway track maintenance equipment— — 18,538 18,538 
After market parts and services; safety and diagnostic technology— — 31,227 31,227 
Railway contracting services— — 13,868 13,868 
Hazardous waste processing solutions— 212,952 — 212,952 
Soil and dredged materials processing and reuse solutions— 37,099 — 37,099 
Total Revenues$261,131 $250,051 $63,633 $574,815 
Three Months Ended
September 30, 2024
(In thousands)
Harsco Environmental
Clean Earth
Harsco Rail
Consolidated Totals
Primary Geographical Markets (a):
North America$70,316 $236,791 $31,644 $338,751 
Western Europe108,709 — 21,294 130,003 
Latin America (b)
38,195 — 247 38,442 
Asia-Pacific31,333 — 4,503 35,836 
Middle East and Africa26,327 — — 26,327 
Eastern Europe 4,268 — — 4,268 
Total Revenues $279,148 $236,791 $57,688 $573,627 
Three Months Ended
September 30, 2024
(In thousands)
Harsco Environmental
Clean Earth
Harsco Rail
Consolidated Totals
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing and related logistical services$235,490 $— $— $235,490 
Ecoproducts36,663 — — 36,663 
Environmental systems for aluminum dross and scrap processing6,995 — — 6,995 
Railway track maintenance equipment— — 19,099 19,099 
After market parts and services; safety and diagnostic technology— — 23,495 23,495 
Railway contracting services— — 15,094 15,094 
Hazardous waste processing solutions— 194,557 — 194,557 
Soil and dredged materials processing and reuse solutions— 42,234 — 42,234 
Total Revenues$279,148 $236,791 $57,688 $573,627 
Nine Months Ended
September 30, 2025
(In thousands)
Harsco Environmental
Clean Earth
Harsco Rail
Consolidated Totals
Primary Geographical Markets (a):
North America$170,589 $731,564 $101,459 $1,003,612 
Western Europe304,056 — 72,262 376,318 
Latin America (b)
106,485 — 2,745 109,230 
Asia-Pacific90,363 — 15,077 105,440 
Middle East and Africa76,668 — — 76,668 
Eastern Europe 14,085 — — 14,085 
Total Revenues $762,246 $731,564 $191,543 $1,685,353 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing and related logistical services$709,072 $— $— $709,072 
Ecoproducts38,497 — — 38,497 
Environmental systems for aluminum dross and scrap processing14,677 — — 14,677 
Railway track maintenance equipment— — 67,258 67,258 
After-market parts and services; safety and diagnostic technology
— — 78,498 78,498 
Railway contracting services— — 45,787 45,787 
Hazardous waste processing solutions— 622,129 — 622,129 
Soil and dredged materials processing and reuse solutions— 109,435 — 109,435 
Total Revenues$762,246 $731,564 $191,543 $1,685,353 
Nine Months Ended
September 30, 2024
(In thousands)
Harsco Environmental
Clean Earth
Harsco Rail
Consolidated Totals
Primary Geographical Markets (a):
North America$238,553 $698,926 $129,119 $1,066,598 
Western Europe328,604 — 61,318 389,922 
Latin America (b)
122,396 — 3,205 125,601 
Asia-Pacific88,593 — 20,173 108,766 
Middle East and Africa79,858 — — 79,858 
Eastern Europe 13,192 — — 13,192 
Total Revenues$871,196 $698,926 $213,815 $1,783,937 
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing and related logistical services$747,303 $— $— $747,303 
Ecoproducts107,190 — — 107,190 
Environmental systems for aluminum dross and scrap processing16,703 — — 16,703 
Railway track maintenance equipment— — 79,535 79,535 
After-market parts and services; safety and diagnostic technology
— — 89,502 89,502 
Railway contracting services— — 44,778 44,778 
Hazardous waste processing solutions— 581,341 — 581,341 
Soil and dredged materials processing and reuse solutions— 117,585 — 117,585 
Total Revenues$871,196 $698,926 $213,815 $1,783,937 
(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 $95.1 million and $97.2 million at September 30, 2025 and December 31, 2024, respectively. The Company had advances on contracts totaling $7.5 million and $23.9 million at September 30, 2025 and December 31, 2024, respectively. The decrease in advances on contracts is due principally to recognition of revenue on previously received advances on contracts in excess of receipts of new advances on contracts during the period. During the three and nine months ended September 30, 2025, the Company recognized $0.5 million and $22.9 million, respectively, of revenue related to amounts previously included in advances on contracts. During the three and nine months ended September 30, 2024, the Company recognized revenues of $4.8 million and $25.3 million, respectively, related to amounts previously included in advances on contracts.

The table below represents the expected fulfillment year of Company's fixed, unsatisfied performance obligations, where the expected contract duration exceeds one year, by segment, and excludes any variable fees, fixed fees subject to indexation and any performance obligations expected to be satisfied within one year:
(In thousands)
Harsco
Environmental
Harsco
Rail
2026$19,384 $35,797 
202716,925 30,298 
202814,009 16,309 
20297,128 7,021 
20303,710 4,095 
Thereafter
4,866 — 
Total remaining performance obligations
$66,022 $93,520 
Rail is currently manufacturing highly-engineered equipment under significant long-term fixed-price contracts with SBB, Network Rail, and Deutsche Bahn. As previously disclosed, the Company has recognized estimated forward loss provisions related to these contracts due to several factors, such as material and labor cost inflation, supply chain delays, the bankruptcy of key vendors, increased engineering efforts and project delays.

For the Network Rail contract, no adjustment was made to the forward loss provision for the three months ended September 30, 2025. For the nine months ended September 30, 2025, the forward loss provision totaled $11.3 million, primarily related to increased estimated manufacturing and material costs. During the third quarter of 2024, the Company recorded an additional loss provision of $11.2 million primarily related to delays in the estimated delivery of the machines and increased engineering and manufacturing costs primarily as a result of design changes. For the nine months ended September 30, 2024, the forward loss provision totaled $13.3 million.

For the Deutsche Bahn contract, no adjustment was made to the forward loss provision during the three months ended September 30, 2025. During the nine months ended September 30, 2025, the Company recorded a net favorable adjustment of $13.3 million that was the result of an amendment to the contract with Deutsche Bahn which included additional pricing, as well as an extension of the delivery schedule for the machines which resulted in a reduction of the previous estimate of penalties. The increased pricing and reduction of penalties were recorded as an increase to revenue. Partially offsetting this were higher estimated material, manufacturing and engineering costs. During the nine months ended September 30, 2024, the Company recorded an additional loss provision of $7.2 million related to supplier price increases, challenges with supplier quality on key components and increased engineering efforts that exceeded previous estimates.

For the SBB contract, during the three months ended September 30, 2025, the Company continued to make progress towards prototype commissioning of the universal vehicle and delivery of the wagons and recorded an additional loss provision of $1.3 million due to higher estimated commissioning, manufacturing, assembly and logistics costs. For the nine months ended September 30, 2025, the forward loss provision totaled $7.2 million. The Company recognized a $0.7 million favorable adjustment to the loss provision for this contract during the three months ended September 30, 2024. For the nine months ended September 30, 2024, the net reduction totaled $0.5 million.

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. To that extent, the Company is currently in discussions with Network Rail and has sent Network Rail a letter communicating the need to bring the negotiations to closure and summarizing various options, including a substantial revision of the contract’s economic terms or finding a mutually acceptable exit to this contract. If the Company were to exit this contract, it could result in a material loss in that period.

As of September 30, 2025, the contracts with Network Rail, Deutsche Bahn and SBB are 67%, 56% and 92% complete, respectively, based on costs incurred under the cost-to-cost method to measure progress.

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.