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Revenue From Customers
 3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue From Customers
3.REVENUE FROM CUSTOMERS
Backlog—The following table presents the Company’s backlog, by segment:
March 31,
2021		December 31,
2020
Heavy Civil Backlog$1,261,461 $898,183 
Specialty Services Backlog377,761 277,205 
Total Heavy Civil and Specialty Services Backlog$1,639,222 $1,175,388 
The Company expects to recognize approximately 52% 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 market20212020
Heavy Highway$99,516 $96,374 
Aviation27,222 28,457 
Water Containment and Treatment14,219 21,809 
Other6,097 8,975 
Heavy Civil Revenues147,054 155,615 
Land Development96,572 76,245 
Commercial27,516 28,478 
Specialty Services Revenues124,088 104,723 
Residential Revenues44,174 36,350 
Total Revenues$315,316 $296,688 
Revenues by contract type
Fixed-Unit Price$177,547 $141,739 
Lump Sum91,155 114,252 
Residential and Other46,614 40,697 
Total Revenues$315,316 $296,688 
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 $7,142, at March 31, 2021 and December 31, 2020, 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 estimated revenues and gross margin resulted in a net increase of approximately $8,305 for the three months ended March 31, 2021, and net increase of approximately $95 for the three months ended March 31, 2020, included in “Operating income” on the Condensed Consolidated Statements of Operations.