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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]  
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):
2022% of
Total		2021% of
Total		2020% of
Total
United States electrical construction and facilities services:
Commercial market sector$1,320,392 54 %$1,063,242 52 %$970,576 53 %
Manufacturing market sector301,606 12 %230,894 11 %241,415 13 %
Healthcare market sector178,348 7 %107,442 5 %79,275 4 %
Institutional market sector154,077 6 %178,729 9 %146,759 8 %
Transportation market sector166,563 7 %196,313 10 %192,656 10 %
Water and wastewater market sector21,251 1 %14,962 1 %6,882 1 %
Hospitality market sector17,563 1 %15,346 1 %23,797 1 %
Short duration projects (1)
211,795 9 %185,277 9 %145,370 8 %
Service work65,709 3 %40,963 2 %28,287 2 %
2,437,304 2,033,168 1,835,017 
Less intersegment revenues(4,190)(3,275)(5,038)
Total segment revenues$2,433,114 $2,029,893 $1,829,979 
2022% of
Total		2021% of
Total		2020% of
Total
United States mechanical construction and facilities services:
Commercial market sector$1,711,772 39 %$1,524,685 39 %$1,315,973 37 %
Manufacturing market sector632,332 15 %579,176 15 %486,753 14 %
Healthcare market sector480,954 11 %488,910 12 %346,315 10 %
Institutional market sector353,611 8 %280,463 7 %377,738 11 %
Transportation market sector57,026 1 %84,503 2 %70,692 2 %
Water and wastewater market sector261,500 6 %213,315 5 %185,996 5 %
Hospitality market sector29,511 1 %38,405 1 %40,079 1 %
Short duration projects (1)
337,522 8 %297,673 8 %335,262 10 %
Service work473,328 11 %452,291 11 %365,067 10 %
4,337,556 3,959,421 3,523,875 
Less intersegment revenues(10,882)(6,835)(7,086)
Total segment revenues$4,326,674 $3,952,586 $3,516,789 
_________________
(1)Represents those projects which generally are completed within three months or less.
2022% of
Total		2021% of
Total		2020% of
Total
United States building services:
Mobile mechanical services$1,713,989 63 %$1,560,120 64 %$1,323,499 64 %
Commercial site-based services810,210 30 %680,351 28 %587,346 28 %
Government site-based services196,288 7 %184,272 8 %167,990 8 %
Total segment revenues$2,720,487 $2,424,743 $2,078,835 
NOTE 3 - REVENUE FROM CONTRACTS WITH CUSTOMERS (Continued)

2022% of
Total		2021% of
Total		2020% of
Total
United States industrial services:
Field services$972,894 87 %$853,143 86 %$813,872 86 %
Shop services145,873 13 %133,264 14 %127,023 14 %
Total segment revenues$1,118,767 $986,407 $940,895 
Total United States operations$10,599,042 $9,393,629 $8,366,498 
2022% of
Total		2021% of
Total		2020% of
Total
United Kingdom building services:
Service work$221,123 46 %$261,889 51 %$221,373 51 %
Project work255,955 54 %248,062 49 %209,190 49 %
Total segment revenues$477,078 $509,951 $430,563 
Total operations$11,076,120 $9,903,580 $8,797,061 
Contract Assets and Contract Liabilities
Net contract liabilities in the accompanying Consolidated Balance Sheets consisted of the following amounts as of December 31, 2022 and 2021 (in thousands):
December 31, 2022December 31, 2021
Contract assets, current$273,176 $230,143 
Contract assets, non-current— — 
Contract liabilities, current(1,098,263)(788,134)
Contract liabilities, non-current(2,273)(2,505)
Net contract liabilities$(827,360)$(560,496)
Net Contract Liabilities on Uncompleted Construction Projects
Included within net contract liabilities were $763.2 million and $500.3 million of net contract liabilities on uncompleted construction projects as of December 31, 2022 and 2021, respectively, as follows (in thousands):
 December 31, 2022December 31, 2021
Costs incurred on uncompleted construction contracts$13,231,612 $11,034,038 
Estimated earnings, thereon2,025,929 1,731,479 
 15,257,541 12,765,517 
Less: billings to date16,020,704 13,265,865 
 $(763,163)$(500,348)
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 (in thousands, except for percentages):
December 31, 2022% of Total
Remaining performance obligations:
United States electrical construction and facilities services$2,014,079 27 %
United States mechanical construction and facilities services4,008,919 54 %
United States building services1,151,031 15 %
United States industrial services124,653 2 %
Total United States operations7,298,682 98 %
United Kingdom building services160,617 2 %
Total operations$7,459,299 100 %
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$1,692,127 $321,952 
        United States mechanical construction and facilities services3,154,465 854,454 
        United States building services1,050,462 100,569 
        United States industrial services118,642 6,011 
        Total United States operations6,015,696 1,282,986 
        United Kingdom building services112,687 47,930 
        Total operations$6,128,383 $1,330,916