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Revenue From Customers
 3 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
Revenue From Customers
4.REVENUE FROM CUSTOMERS
Remaining Performance Obligations (“RPOs”)—RPOs represent the aggregate amount of our contract transaction price related to performance obligations that are unsatisfied or partially satisfied at the end of the period. RPOs include the entire expected revenue values for joint ventures we consolidate and our proportionate value for those we proportionately consolidate. RPOs may not be indicative of future operating results. Projects included in RPOs may be canceled or modified by customers; however, the customer would be obligated to compensate the Company for additional contractual costs for cancellation or modifications. The following table presents the Company’s RPOs, by segment:
March 31, 2024December 31, 2023
E-Infrastructure Solutions RPOs$961,035 $813,729 
Transportation Solutions RPOs1,305,381 1,184,496 
Building Solutions RPOs - Commercial85,710 68,791 
Total RPOs$2,352,126 $2,067,016 
The Company expects to recognize approximately 65% of its RPOs 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 March 31,
Revenues by major end market20242023
E-Infrastructure Solutions Revenues$184,476 $205,840 
Heavy Highway93,377 67,266 
Aviation18,140 13,436 
Other Services
37,452 30,437 
Transportation Solutions Revenues148,969 111,139 
Residential83,769 53,714 
Commercial23,146 32,886 
Building Solutions Revenues106,915 86,600 
Total Revenues$440,360 $403,579 
Revenues by contract type
Lump-Sum$224,161 $112,863 
Fixed-Unit Price130,861 236,699 
Residential and Other85,338 54,017 
Total Revenues$440,360 $403,579 
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 $5,525 and $5,225, at March 31, 2024 and December 31, 2023, 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 resulted in net increases of $21,528 and $8,613 for the three months ended March 31, 2024 and 2023, respectively, and are included in “Operating income” on the Condensed Consolidated Statements of Operations.