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Revenue Recognition
 3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue RecognitionThe 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 or products. Service revenues include the Harsco Clean Earth Segment and the service components of the Harsco Environmental and Harsco Rail Segments. Product revenues include portions of the Harsco Environmental and Harsco Rail Segments.
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, 2021
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth
Segment		Harsco
Rail
Segment		Consolidated Totals
Primary Geographical Markets (a) (b):
North America$67,181 $189,279 $58,261 $314,721 
Western Europe112,171 — 16,633 128,804 
Latin America (c)
30,653 — 560 31,213 
Asia-Pacific23,370 — 6,136 29,506 
Middle East and Africa20,121 — — 20,121 
Eastern Europe 4,490 — — 4,490 
Total Revenues$257,986 $189,279 $81,590 $528,855 
Key Product and Service Groups (a):
Environmental services related to resource recovery for metals manufacturing and related logistical services$225,060 $— $— $225,060 
Applied products29,785 — — 29,785 
Environmental systems for aluminum dross and scrap processing3,141 — — 3,141 
Railway track maintenance equipment— — 46,440 46,440 
After market parts and services; safety and diagnostic technology— — 26,769 26,769 
Railway contracting services— — 8,381 8,381 
Waste processing, recycling, reuse and transportation solutions— 189,279 — 189,279 
Total Revenues$257,986 $189,279 $81,590 $528,855 


Three Months Ended
March 31, 2020
(In thousands)Harsco Environmental SegmentHarsco
Clean Earth
Segment		Harsco
Rail
Segment		Consolidated Totals
Primary Geographical Markets (a) (b):
North America$69,881 $78,812 $53,773 $202,466 
Western Europe96,317 — 18,164 114,481 
Latin America (c)
33,260 — 665 33,925 
Asia-Pacific21,996 — 5,868 27,864 
Middle East and Africa15,889 — — 15,889 
Eastern Europe 4,216 — — 4,216 
Total Revenues $241,559 $78,812 $78,470 $398,841 
Key Product and Service Groups (a):
Environmental services related to resource recovery for metals manufacturing and related logistical services$207,596 $— $— $207,596 
Applied products30,262 — — 30,262 
Environmental systems for aluminum dross and scrap processing3,701 — — 3,701 
Railway track maintenance equipment— — 42,615 42,615 
After market parts and services; safety and diagnostic technology— — 31,200 31,200 
Railway contracting services— — 4,655 4,655 
Waste processing, recycling, reuse and transportation solutions— 78,812 — 78,812 
Total Revenues$241,559 $78,812 $78,470 $398,841 
(a)    The Company's acquisition of ESOL closed on April 6, 2020. The results are included in the Harsco Clean Earth Segment. See Note 3, Acquisitions and Dispositions, for additional details.
(b)     Revenues are attributed to individual countries based on the location of the facility generating the revenue.
(c)     Includes Mexico.

The Company may receive payments in advance of earning revenue, which are treated as Advances on contracts on the Condensed Consolidated Balance Sheets. The Company may recognize revenue in advance of being able to contractually invoice the customer, which is treated as Contract assets on the Condensed Consolidated Balance Sheets. Non-current contract assets are included in 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 Contract liabilities 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 the Harsco Rail Segment.

The Company had Contract assets totaling $79.1 million and $60.1 million at March 31, 2021 and December 31, 2020, respectively. The increase is due principally to additional contract assets recognized in excess of the transfer of contract assets to accounts receivable, primarily in the Harsco Rail Segment. The Company had Advances on contracts totaling $72.5 million and $84.9 million at March 31, 2021 and December 31, 2020, respectively. The decrease is due principally to the recognition of revenue on previously received Advances on contracts in excess of the receipt of new advances on contracts during the period, primarily in the Harsco Rail Segment. During the three months ended March 31, 2021 and 2020, the Company recognized approximately $17 million and $18 million, respectively, of revenue related to amounts previously included in Advances on contracts.
At March 31, 2021 the Harsco Environmental Segment had remaining, fixed, unsatisfied performance obligations where the expected contract duration exceeds one year totaling $74.7 million. Of this amount, $17.9 million is expected to be fulfilled by March 31, 2022, $16.7 million by March 31, 2023, $15.5 million by March 31, 2024, $15.2 million by March 31, 2025 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, 2021 the Harsco Rail Segment had remaining, fixed, unsatisfied performance obligations where the expected contract duration exceeds one year totaling $299.5 million. Of this amount, $121.3 million is expected to be fulfilled by March 31, 2022, $102.8 million by March 31, 2023, $52.6 million by March 31, 2024, $14.5 million by March 31, 2025 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.

The Company recognized an initial estimated forward loss provision related to the contracts with SBB of $45.1 million for the year ended December 31, 2016. The Company recorded an additional forward loss provision of $1.8 million for the year ended December 31, 2018. At March 31, 2021 and December 31, 2020 the remaining estimated forward loss provision of $3.8 million and $4.4 million, respectively, is included in the caption Other current liabilities on the Condensed Consolidated Balance Sheets. The estimated forward loss provision represents the Company's best estimate based on currently available information. It is possible that the Company's overall estimate of costs to complete these contracts may increase, which would result in an additional estimated forward loss provision at such time.

The Company recognized $5.2 million and $10.1 million of revenues for the contracts with SBB on an over time basis, utilizing a cost-to-cost method for the three months ended March 31, 2021 and 2020, respectively. The Company has substantially completed the first contract and is approximately 74% complete on the second contract with SBB as of March 31, 2021.

The Company provides assurance type warranties primarily for product sales in the Harsco Rail Segment. 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.
Concurrent to the ESOL acquisition, the Company entered into an agreement with Stericycle Inc. related to certain Stericycle, Inc. customers who receive services from both ESOL and other Stericycle, Inc. businesses under a single contractual arrangement. The revenue pertaining to services rendered to these customers are invoiced centrally through Stericycle, Inc. billing systems and ESOL's portion of the revenue, less a management fee, is then distributed to the Company.