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Revenue From Customers
 9 Months Ended
Sep. 30, 2022
Revenue from Contract with Customer [Abstract]  
Revenue From Customers
4.REVENUE FROM CUSTOMERS
Backlog—The following table presents the Company’s backlog, by segment:
September 30,
2022		December 31,
2021
E-Infrastructure Solutions Backlog$584,279 $432,613 
Transportation Solutions Backlog965,546 963,267 
Building Solutions Backlog - Commercial115,518 97,235 
Total Backlog$1,665,343 $1,493,115 
The Company expects to recognize approximately 70% of its backlog as revenue during the next twelve months, and the balance thereafter.
Revenue Disaggregation—The following tables present the Company’s revenue disaggregated by major end market and contract type:
Three Months Ended September 30,Nine Months Ended September 30,
Revenues by major end market2022202120222021
E-Infrastructure Solutions Revenues$255,530 $121,286 $658,005 $341,601 
Heavy Highway155,847 188,746 408,216 427,451 
Aviation25,463 35,840 61,980 99,816 
Water Containment and Treatment23,373 11,463 60,377 41,890 
Other16,443 13,849 42,433 30,948 
Transportation Solutions Revenues221,126 249,898 573,006 600,105 
Residential51,304 65,295 166,045 156,078 
Commercial28,982 26,970 80,774 82,647 
Building Solutions Revenues80,286 92,265 246,819 238,725 
Total Revenues$556,942 $463,449 $1,477,830 $1,180,431 
Revenues by contract type
Fixed-Unit Price$217,296 $267,092 $554,014 $670,526 
Lump-Sum287,472 129,742 752,614 348,313 
Residential and Other52,174 66,615 171,202 161,592 
Total Revenues$556,942 $463,449 $1,477,830 $1,180,431 
Each of these contract types presents advantages and disadvantages. Typically, the Company assumes more risk with lump-sum contracts; however, these types of contracts offer additional profits if the work is completed for less than originally estimated. Under fixed-unit price contracts, the Company’s profit may vary if actual labor-hour costs vary significantly from the negotiated rates. Also, because some contracts can provide little or no fee for managing material costs, the components of contract cost can impact profitability.
Variable Consideration
The Company has projects that it is in the process of negotiating, or awaiting final approval of, unapproved change orders and claims with its customers. The Company is proceeding with its contractual rights to recoup additional costs incurred from its customers based on completing work associated with change orders, including change orders with pending change order pricing, or claims related to significant changes in scope which resulted in substantial delays and additional costs in completing the work. Unapproved change order and claim information has been provided to the Company’s customers and negotiations with the customers are ongoing. If additional progress with an acceptable resolution is not reached, legal action will be taken. Based upon the Company’s review of the provisions of its contracts, specific costs incurred and other related evidence supporting the unapproved change orders and claims, together in some cases as necessary with the views of the Company’s outside claim consultants, the Company concluded it was appropriate to include in project price amounts of $14,680 and $13,905, at September 30, 2022 and December 31, 2021, respectively, relating to unapproved change orders and claims. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined.
Contract Estimates
Accounting for long-term contracts and programs involves the use of various techniques to estimate total contract revenue and costs. For long-term contracts, the Company estimates the profit on a contract as the difference between the total estimated revenue and expected costs to complete a contract and recognizes such profit over the life of the contract. Contract estimates are based on various assumptions to project the outcome of future events that often span several years. These assumptions include labor productivity and availability, the complexity of the work to be performed, the cost and availability of materials and the performance of subcontractors. Changes in job performance, job conditions and estimated profitability, including those changes arising from contract penalty provisions and final contract settlements, may result in revisions to costs and income and are recognized in the period in which the revisions are determined. Changes in contract estimates and variations in project scope of work resulted in net increases of approximately $13,400 and $39,400 for the three and nine months ended September 30, 2022, respectively, and in a net decrease of approximately $360 and a net increase of $11,700 for the three and nine months ended September 30, 2021, respectively, included in “Operating income” on the Condensed Consolidated Statements of Operations.