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Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2023
Revenue from Contract with Customer [Abstract] |
Cumulative Catch-Up Adjustment | Based on an evaluation of individual projects that had revisions to total estimated costs, or anticipated contract value, which resulted in a reduction of profitability in excess of $1.0 million, our operating results were negatively impacted during the years ended December 31, 2023, 2022, and 2021, as summarized in the following table (in thousands):
| 2023 |  | 2022 |  | 2021
United States electrical construction and facilities services | $ | 12,535 |  |  | $ | 33,463 |  |  | $ | 4,627 |
United States mechanical construction and facilities services | 10,864 |  |  | 13,679 |  |  | 2,264 |
United States building services | 5,658 |  |  | 1,261 |  |  | — |
Total impact | $ | 29,057 |  |  | $ | 48,403 |  |  | $ | 6,891 |
Disaggregation of Revenues | The following tables provide further disaggregation of our revenues by categories we use to evaluate our financial performance within each of our reportable segments (in thousands, except for percentages). Refer to Note 18 - Segment Information of the notes to consolidated financial statements for additional information on how we disaggregate our revenues by reportable segment. Due to continued growth in certain of our end markets, during 2023, we have expanded the market sectors included in the disclosure for each of our United States construction segments, as shown below. All prior period disclosures have been adjusted to additionally reflect these changes.
| 2023 |  | % of Total |  | 2022 |  | % of Total |  | 2021 |  | % of Total
United States electrical construction and facilities services: |  |  |  |  |  |  |  |  |  |
Network and communications market sector | $ | 934,455 |  |  | 34 | % |  | $ | 801,052 |  |  | 33 | % |  | $ | 621,139 |  |  | 30 | %
Commercial market sector | 402,886 |  |  | 14 | % |  | 414,539 |  |  | 17 | % |  | 398,996 |  |  | 20 | %
Manufacturing and industrial market sector | 394,804 |  |  | 14 | % |  | 301,606 |  |  | 12 | % |  | 230,894 |  |  | 11 | %
Healthcare market sector | 242,931 |  |  | 9 | % |  | 178,348 |  |  | 7 | % |  | 107,442 |  |  | 5 | %
High-tech manufacturing market sector | 140,471 |  |  | 5 | % |  | 88,544 |  |  | 4 | % |  | 35,196 |  |  | 2 | %
Institutional market sector | 147,375 |  |  | 5 | % |  | 154,077 |  |  | 6 | % |  | 178,729 |  |  | 9 | %
Transportation market sector | 167,976 |  |  | 6 | % |  | 166,563 |  |  | 7 | % |  | 196,313 |  |  | 10 | %
Water and wastewater market sector | 21,234 |  |  | 1 | % |  | 21,251 |  |  | 1 | % |  | 14,962 |  |  | 1 | %
Hospitality and entertainment market sector | 81,815 |  |  | 3 | % |  | 33,818 |  |  | 1 | % |  | 23,257 |  |  | 1 | %
Short duration projects (1) | 186,722 |  |  | 7 | % |  | 211,797 |  |  | 9 | % |  | 185,277 |  |  | 9 | %
Service work | 65,338 |  |  | 2 | % |  | 65,709 |  |  | 3 | % |  | 40,963 |  |  | 2 | %
| 2,786,007 |  |  |  |  | 2,437,304 |  |  |  |  | 2,033,168 |  |  |
Less intersegment revenues | (2,284) |  |  |  |  | (4,190) |  |  |  |  | (3,275) |  |  |
Total segment revenues | $ | 2,783,723 |  |  |  |  | $ | 2,433,114 |  |  |  |  | $ | 2,029,893 |  |  |
| 2023 |  | % of Total |  | 2022 |  | % of Total |  | 2021 |  | % of Total
United States mechanical construction and facilities services: |  |  |  |  |  |  |  |  |  |
Network and communications market sector | $ | 410,397 |  |  | 8 | % |  | $ | 295,261 |  |  | 7 | % |  | $ | 279,953 |  |  | 7 | %
Commercial market sector | 1,115,993 |  |  | 22 | % |  | 1,079,872 |  |  | 25 | % |  | 1,042,751 |  |  | 27 | %
Manufacturing and industrial market sector | 698,993 |  |  | 14 | % |  | 632,332 |  |  | 15 | % |  | 579,176 |  |  | 15 | %
Healthcare market sector | 489,485 |  |  | 10 | % |  | 479,937 |  |  | 11 | % |  | 487,111 |  |  | 12 | %
High-tech manufacturing market sector | 845,251 |  |  | 16 | % |  | 320,597 |  |  | 7 | % |  | 173,302 |  |  | 4 | %
Institutional market sector | 316,255 |  |  | 6 | % |  | 331,727 |  |  | 8 | % |  | 263,285 |  |  | 7 | %
Transportation market sector | 42,789 |  |  | 1 | % |  | 57,026 |  |  | 1 | % |  | 84,503 |  |  | 2 | %
Water and wastewater market sector | 286,912 |  |  | 6 | % |  | 261,501 |  |  | 6 | % |  | 213,314 |  |  | 5 | %
Hospitality and entertainment market sector | 52,919 |  |  | 1 | % |  | 44,615 |  |  | 1 | % |  | 66,059 |  |  | 2 | %
Short duration projects (1) | 324,056 |  |  | 6 | % |  | 333,066 |  |  | 8 | % |  | 292,795 |  |  | 8 | %
Service work | 500,853 |  |  | 10 | % |  | 467,156 |  |  | 11 | % |  | 446,786 |  |  | 11 | %
| 5,083,903 |  |  |  |  | 4,303,090 |  |  |  |  | 3,929,035 |  |  |
Less intersegment revenues | (9,100) |  |  |  |  | (10,882) |  |  |  |  | (6,835) |  |  |
Total segment revenues | $ | 5,074,803 |  |  |  |  | $ | 4,292,208 |  |  |  |  | $ | 3,922,200 |  |  |
_________________ (1)Represents those projects which generally are completed within three months or less. NOTE 3 - REVENUE FROM CONTRACTS WITH CUSTOMERS (Continued)
| 2023 |  | % of Total |  | 2022 |  | % of Total |  | 2021 |  | % of Total
United States building services: |  |  |  |  |  |  |  |  |  |  |
Mechanical services | $ | 2,042,244 |  |  | 65 | % |  | $ | 1,748,455 |  |  | 64 | % |  | $ | 1,590,506 |  |  | 65 | %
Commercial site-based services | 865,232 |  |  | 28 | % |  | 810,210 |  |  | 29 | % |  | 680,351 |  |  | 28 | %
Government site-based services | 212,658 |  |  | 7 | % |  | 196,288 |  |  | 7 | % |  | 184,272 |  |  | 7 | %
Total segment revenues | $ | 3,120,134 |  |  |  |  | $ | 2,754,953 |  |  |  |  | $ | 2,455,129 |  |  |
| 2023 |  | % of Total |  | 2022 |  | % of Total |  | 2021 |  | % of Total
United States industrial services: |  |  |  |  |  |  |  |  |  |  |
Field services | $ | 991,466 |  |  | 85 | % |  | $ | 972,894 |  |  | 87 | % |  | $ | 853,143 |  |  | 86 | %
Shop services | 176,324 |  |  | 15 | % |  | 145,873 |  |  | 13 | % |  | 133,264 |  |  | 14 | %
Total segment revenues | $ | 1,167,790 |  |  |  |  | $ | 1,118,767 |  |  |  |  | $ | 986,407 |  |  |
Total United States operations | $ | 12,146,450 |  |  |  |  | $ | 10,599,042 |  |  |  |  | $ | 9,393,629 |  |  |
| 2023 |  | % of Total |  | 2022 |  | % of Total |  | 2021 |  | % of Total
United Kingdom building services: |  |  |  |  |  |  |  |  |  |  |
Service work | $ | 210,414 |  |  | 48 | % |  | $ | 221,123 |  |  | 46 | % |  | $ | 261,889 |  |  | 51 | %
Project work | 226,009 |  |  | 52 | % |  | 255,955 |  |  | 54 | % |  | 248,062 |  |  | 49 | %
Total segment revenues | $ | 436,423 |  |  |  |  | $ | 477,078 |  |  |  |  | $ | 509,951 |  |  |
Total operations | $ | 12,582,873 |  |  |  |  | $ | 11,076,120 |  |  |  |  | $ | 9,903,580 |  |  |
Contract Assets and Contract Liabilities | Net contract liabilities in the accompanying Consolidated Balance Sheets consisted of the following amounts as of December 31, 2023 and 2022 (in thousands):
| December 31, 2023 |  | December 31, 2022
Contract assets, current | $ | 269,885 |  |  | $ | 273,176 |
Contract assets, non-current | — |  |  | — |
Contract liabilities, current | (1,595,109) |  |  | (1,098,263) |
Contract liabilities, non-current | (1,812) |  |  | (2,273) |
Net contract liabilities | $ | (1,327,036) |  |  | $ | (827,360) |
Net Contract Liabilities on Uncompleted Construction Projects | Included within net contract liabilities were $1,261.1 million and $763.2 million of net contract liabilities on uncompleted construction projects as of December 31, 2023 and 2022, respectively, as follows (in thousands):
| December 31, 2023 |  | December 31, 2022
Costs incurred on uncompleted construction contracts | $ | 15,100,829 |  |  | $ | 13,231,612 |
Estimated earnings, thereon | 2,381,049 |  |  | 2,025,929 |
| 17,481,878 |  |  | 15,257,541 |
Less: billings to date | 18,742,934 |  |  | 16,020,704 |
| $ | (1,261,056) |  |  | $ | (763,163) |
Remaining Performance Obligations | The following table presents the transaction price allocated to remaining unsatisfied performance obligations (“remaining performance obligations”) for each of our reportable segments and their respective percentages of total remaining performance obligations as of December 31, 2023 (in thousands, except for percentages):
| December 31, 2023 |  | % of Total
Remaining performance obligations: |  |  |
United States electrical construction and facilities services | $ | 2,387,844 |  |  | 27 | %
United States mechanical construction and facilities services | 4,940,519 |  |  | 56 | %
United States building services | 1,264,818 |  |  | 14 | %
United States industrial services | 113,291 |  |  | 1 | %
Total United States operations | 8,706,472 |  |  | 98 | %
United Kingdom building services | 140,949 |  |  | 2 | %
Total operations | $ | 8,847,421 |  |  | 100 | %
Remaining Performance Obligations, Expected Timing of Satisfaction | Refer to the table below for additional information regarding our remaining performance obligations, including an estimate of when we expect to recognize such remaining performance obligations as revenue (in thousands):
| Within one year |  | Greater than one year
Remaining performance obligations: |  |  |
United States electrical construction and facilities services | $ | 1,978,179 |  |  | $ | 409,665 |
United States mechanical construction and facilities services | 4,314,365 |  |  | 626,154 |
United States building services | 1,157,845 |  |  | 106,973 |
United States industrial services | 113,291 |  |  | — |
Total United States operations | 7,563,680 |  |  | 1,142,792 |
United Kingdom building services | 94,711 |  |  | 46,238 |
Total operations | $ | 7,658,391 |  |  | $ | 1,189,030 |

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