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Revenue From Customers
 3 Months Ended
Mar. 31, 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:
March 31,
2022		December 31,
2021
E-Infrastructure Solutions Backlog$541,150 $432,613 
Transportation Solutions Backlog898,679 963,267 
Building Solutions Backlog - Commercial87,055 97,235 
Total Backlog$1,526,884 $1,493,115 
The Company expects to recognize approximately 68% 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 March 31,
Revenues by major end market20222021
E-Infrastructure Solutions Revenues$168,927 $96,572 
Heavy Highway112,745 99,516 
Aviation17,583 27,222 
Water Containment and Treatment19,887 14,219 
Other10,284 6,097 
Transportation Solutions Revenues160,499 147,054 
Residential54,270 44,174 
Commercial26,624 27,516 
Building Solutions Revenues80,894 71,690 
Total Revenues$410,320 $315,316 
Revenues by contract type
Fixed-Unit Price$156,310 $177,547 
Lump-Sum197,868 91,155 
Residential and Other56,142 46,614 
Total Revenues$410,320 $315,316 
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 $13,985 and $13,905, at March 31, 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 scope resulted in a net increase of $15,400 and $8,300 for the three months ended March 31, 2022 and 2021, respectively, included in “Operating income” on the Condensed Consolidated Statements of Operations.