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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2020
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):
2020% of
Total		2019% of
Total		2018% of
Total
United States electrical construction and facilities services:
Commercial market sector$971,283 49 %$1,081,737 49 %$839,045 43 %
Institutional market sector149,363 7 %125,537 6 %110,046 6 %
Hospitality market sector23,797 1 %16,985 1 %32,338 2 %
Manufacturing market sector381,542 19 %462,953 21 %388,157 20 %
Healthcare market sector79,275 4 %88,752 4 %126,218 6 %
Transportation market sector192,656 10 %210,515 9 %284,464 14 %
Water and wastewater market sector6,882 1 %19,921 1 %23,337 1 %
Short duration projects (1)
121,061 6 %158,619 7 %120,109 6 %
Service work52,687 3 %54,955 2 %34,105 2 %
1,978,546 2,219,974 1,957,819 
Less intersegment revenues(5,119)(3,374)(3,496)
Total segment revenues$1,973,427 $2,216,600 $1,954,323 
2020% of
Total		2019% of
Total		2018% of
Total
United States mechanical construction and facilities services:
Commercial market sector$1,316,013 38 %$1,185,129 36 %$1,057,542 35 %
Institutional market sector377,780 11 %313,409 9 %289,882 10 %
Hospitality market sector40,079 1 %35,385 1 %93,827 3 %
Manufacturing market sector430,365 12 %533,699 16 %393,637 13 %
Healthcare market sector349,235 10 %304,622 9 %240,818 8 %
Transportation market sector70,692 2 %32,686 1 %19,415 1 %
Water and wastewater market sector185,996 5 %202,428 6 %176,546 6 %
Short duration projects (1)
343,799 10 %365,721 11 %318,413 11 %
Service work378,054 11 %378,839 11 %385,671 13 %
3,492,013 3,351,918 2,975,751 
Less intersegment revenues(6,518)(11,581)(12,908)
Total segment revenues$3,485,495 $3,340,337 $2,962,843 
 ________
(1)Represents those projects which generally are completed within three months or less.
2020% of
Total		2019% of
Total		2018% of
Total
United States building services:
Commercial site-based services$587,345 28 %$571,345 27 %$519,641 28 %
Government site-based services167,990 8 %176,282 8 %213,677 11 %
Mobile mechanical services1,258,916 60 %1,238,420 59 %1,032,082 55 %
Energy services95,878 4 %120,825 6 %110,085 6 %
Total segment revenues$2,110,129 $2,106,872 $1,875,485 
NOTE 3 - REVENUE FROM CONTRACTS WITH CUSTOMERS - (Continued)

2020% of
Total		2019% of
Total		2018% of
Total
United States industrial services:
Field services$670,424 84 %$922,308 85 %$752,458 82 %
Shop services127,023 16 %165,235 15 %170,651 18 %
Total segment revenues$797,447 $1,087,543 $923,109 
Total United States operations$8,366,498 $8,751,352 $7,715,760 
2020% of
Total		2019% of
Total		2018% of
Total
United Kingdom building services:
Service work$221,373 51 %$212,876 50 %$216,880 52 %
Project work209,190 49 %210,383 50 %197,991 48 %
Total segment revenues$430,563 $423,259 $414,871 
Total operations$8,797,061 $9,174,611 $8,130,631 
Contract Assets and Contract Liabilities
Net contract liabilities consisted of the following (in thousands):
20202019
Contract assets, current$171,956 $177,830 
Contract assets, non-current— — 
Contract liabilities, current(722,252)(623,642)
Contract liabilities, non-current(2,283)(2,142)
Net contract liabilities$(552,579)$(447,954)
Net Contract Liabilities on Uncompleted Construction Projects
Included within net contract liabilities were $496.8 million and $406.6 million of net contract liabilities on uncompleted construction projects as of December 31, 2020 and 2019, respectively, as follows (in thousands):
 20202019
Costs incurred on uncompleted construction contracts$10,727,358 $9,885,192 
Estimated earnings, thereon1,640,250 1,349,338 
 12,367,608 11,234,530 
Less: billings to date12,864,404 11,641,082 
 $(496,796)$(406,552)
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):
2020% of Total
Remaining performance obligations:
United States electrical construction and facilities services$1,087,238 24 %
United States mechanical construction and facilities services2,673,293 58 %
United States building services612,179 13 %
United States industrial services91,237 2 %
Total United States operations4,463,947 97 %
United Kingdom building services130,673 3 %
Total operations$4,594,620 100 %
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$946,735 $140,503 
        United States mechanical construction and facilities services2,122,777 550,516 
        United States building services559,159 53,020 
        United States industrial services91,237 — 
        Total United States operations3,719,908 744,039 
        United Kingdom building services97,493 33,180 
        Total operations$3,817,401 $777,219