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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2021
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):
2021% of
Total		2020% of
Total		2019% of
Total
United States electrical construction and facilities services:
Commercial market sector$1,059,908 52 %$963,452 53 %$1,078,200 55 %
Manufacturing market sector226,644 11 %241,415 13 %224,913 11 %
Healthcare market sector106,412 5 %72,778 4 %85,088 4 %
Institutional market sector177,312 9 %140,837 8 %120,991 6 %
Transportation market sector196,313 10 %192,656 11 %209,830 11 %
Water and wastewater market sector14,962 1 %6,882 1 %19,888 1 %
Hospitality market sector15,342 1 %23,797 1 %16,985 1 %
Short duration projects (1)
182,614 9 %142,542 8 %170,631 9 %
Service work39,199 2 %26,858 1 %38,500 2 %
2,018,706 1,811,217 1,965,026 
Less intersegment revenues(3,240)(5,125)(3,228)
Total segment revenues$2,015,466 $1,806,092 $1,961,798 
2021% of
Total		2020% of
Total		2019% of
Total
United States mechanical construction and facilities services:
Commercial market sector$1,525,816 39 %$1,316,013 38 %$1,185,129 36 %
Manufacturing market sector523,896 13 %430,365 12 %533,699 16 %
Healthcare market sector489,028 12 %349,235 10 %304,622 9 %
Institutional market sector280,463 7 %377,780 11 %313,409 9 %
Transportation market sector84,503 2 %70,692 2 %32,686 1 %
Water and wastewater market sector213,315 6 %185,996 5 %202,428 6 %
Hospitality market sector38,405 1 %40,079 1 %35,385 1 %
Short duration projects (1)
308,467 8 %343,799 10 %365,721 11 %
Service work466,860 12 %378,054 11 %378,839 11 %
3,930,753 3,492,013 3,351,918 
Less intersegment revenues(7,889)(6,518)(11,581)
Total segment revenues$3,922,864 $3,485,495 $3,340,337 
_________________
(1)Represents those projects which generally are completed within three months or less.
2021% of
Total		2020% of
Total		2019% of
Total
United States building services:
Mobile mechanical services$1,501,919 61 %$1,282,803 60 %$1,253,209 59 %
Commercial site-based services680,351 28 %587,345 28 %571,345 27 %
Government site-based services184,272 7 %167,990 8 %176,282 8 %
Energy services102,350 4 %95,878 4 %120,825 6 %
Total segment revenues$2,468,892 $2,134,016 $2,121,661 
NOTE 3 - REVENUE FROM CONTRACTS WITH CUSTOMERS (Continued)

2021% of
Total		2020% of
Total		2019% of
Total
United States industrial services:
Field services$853,143 86 %$813,872 86 %$1,162,321 88 %
Shop services133,264 14 %127,023 14 %165,235 12 %
Total segment revenues$986,407 $940,895 $1,327,556 
Total United States operations$9,393,629 $8,366,498 $8,751,352 
2021% of
Total		2020% of
Total		2019% of
Total
United Kingdom building services:
Service work$261,889 51 %$221,373 51 %$212,876 50 %
Project work248,062 49 %209,190 49 %210,383 50 %
Total segment revenues$509,951 $430,563 $423,259 
Total operations$9,903,580 $8,797,061 $9,174,611 
Contract Assets and Contract Liabilities
Net contract liabilities in the accompanying Consolidated Balance Sheets consisted of the following amounts as of December 31, 2021 and 2020 (in thousands):
December 31, 2021December 31, 2020
Contract assets, current$230,143 $171,956 
Contract assets, non-current— — 
Contract liabilities, current(788,134)(722,252)
Contract liabilities, non-current(2,505)(2,283)
Net contract liabilities$(560,496)$(552,579)
Net Contract Liabilities on Uncompleted Construction Projects
Included within net contract liabilities were $500.3 million and $496.8 million of net contract liabilities on uncompleted construction projects as of December 31, 2021 and 2020, respectively, as follows (in thousands):
 December 31, 2021December 31, 2020
Costs incurred on uncompleted construction contracts$11,034,038 $10,727,358 
Estimated earnings, thereon1,731,479 1,640,250 
 12,765,517 12,367,608 
Less: billings to date13,265,865 12,864,404 
 $(500,348)$(496,796)
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, 2021% of Total
Remaining performance obligations:
United States electrical construction and facilities services$1,210,568 22 %
United States mechanical construction and facilities services3,320,359 59 %
United States building services838,324 15 %
United States industrial services111,838 2 %
Total United States operations5,481,089 98 %
United Kingdom building services118,208 2 %
Total operations$5,599,297 100 %
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$1,073,432 $137,136 
        United States mechanical construction and facilities services2,640,609 679,750 
        United States building services751,602 86,722 
        United States industrial services111,838 — 
        Total United States operations4,577,481 903,608 
        United Kingdom building services92,371 25,837 
        Total operations$4,669,852 $929,445