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Revenue from Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 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, for the three and six months ended June 30, 2021 and 2020 (in thousands):
For the three months ended June 30,
2021% of
Total		2020% of
Total
United States electrical construction and facilities services:
Commercial market sector$253,774 52 %$212,318 52 %
Institutional market sector52,587 11 %32,691 8 %
Hospitality market sector4,100 1 %4,899 1 %
Manufacturing market sector51,998 10 %55,910 13 %
Healthcare market sector25,678 5 %16,025 4 %
Transportation market sector53,179 11 %47,966 12 %
Water and wastewater market sector1,877 1 %1,907 1 %
Short duration projects (1)
37,484 7 %33,507 8 %
Service work9,403 2 %5,999 1 %
490,080 411,222 
Less intersegment revenues(593)(834)
Total segment revenues$489,487 $410,388 

For the three months ended June 30,
2021% of
Total		2020% of
Total
United States mechanical construction and facilities services:
Commercial market sector$397,482 41 %$273,434 35 %
Institutional market sector71,464 7 %99,829 13 %
Hospitality market sector11,258 1 %9,098 1 %
Manufacturing market sector102,224 11 %100,608 13 %
Healthcare market sector121,745 13 %80,528 10 %
Transportation market sector20,704 2 %19,669 2 %
Water and wastewater market sector44,702 5 %45,606 6 %
Short duration projects (1)
83,604 9 %73,955 9 %
Service work107,240 11 %88,684 11 %
960,423 791,411 
Less intersegment revenues(1,737)(970)
Total segment revenues$958,686 $790,441 
 ________
(1)Represents those projects which generally are completed within three months or less.
NOTE 3 - Revenue from Contracts with Customers (Continued)
For the three months ended June 30,
2021% of
Total		2020% of
Total
United States building services:
Commercial site-based services$152,851 25 %$132,078 28 %
Government site-based services46,587 7 %38,419 8 %
Mobile mechanical services398,813 64 %289,531 60 %
Energy services26,205 4 %18,954 4 %
Total segment revenues$624,456 $478,982 
For the three months ended June 30,
2021% of
Total		2020% of
Total
United States industrial services:
Field services$208,797 89 %$206,288 86 %
Shop services26,366 11 %34,805 14 %
Total segment revenues$235,163 $241,093 
Total United States operations$2,307,792 $1,920,904 
For the three months ended June 30,
2021% of
Total		2020% of
Total
United Kingdom building services:
Service work$66,572 51 %$51,139 55 %
Project work63,302 49 %41,978 45 %
Total segment revenues$129,874 $93,117 
Total operations$2,437,666 $2,014,021 
For the six months ended June 30,
2021% of
Total		2020% of
Total
United States electrical construction and facilities services:
Commercial market sector$498,757 53 %$452,164 52 %
Institutional market sector95,716 10 %70,084 8 %
Hospitality market sector8,764 1 %9,981 1 %
Manufacturing market sector100,421 10 %122,753 14 %
Healthcare market sector45,092 5 %35,250 4 %
Transportation market sector95,210 10 %92,146 10 %
Water and wastewater market sector5,528 1 %4,236 1 %
Short duration projects (1)
81,284 8 %73,777 8 %
Service work16,671 2 %13,446 2 %
947,443 873,837 
Less intersegment revenues(1,788)(1,646)
Total segment revenues$945,655 $872,191 
 ________
(1)Represents those projects which generally are completed within three months or less.
NOTE 3 - Revenue from Contracts with Customers (Continued)
For the six months ended June 30,
2021% of
Total		2020% of
Total
United States mechanical construction and facilities services:
Commercial market sector$764,157 41 %$578,124 36 %
Institutional market sector140,768 7 %176,826 11 %
Hospitality market sector19,787 1 %16,812 1 %
Manufacturing market sector207,651 11 %216,190 13 %
Healthcare market sector234,530 13 %168,587 10 %
Transportation market sector39,121 2 %34,015 2 %
Water and wastewater market sector88,550 5 %86,119 5 %
Short duration projects (1)
172,387 9 %171,157 11 %
Service work199,018 11 %179,577 11 %
1,865,969 1,627,407 
Less intersegment revenues(3,358)(2,854)
Total segment revenues$1,862,611 $1,624,553 
 ________
(1)Represents those projects which generally are completed within three months or less.
For the six months ended June 30,
2021% of
Total		2020% of
Total
United States building services:
Commercial site-based services$328,498 27 %$275,516 27 %
Government site-based services87,659 7 %81,336 8 %
Mobile mechanical services733,763 61 %602,450 60 %
Energy services56,375 5 %47,291 5 %
Total segment revenues$1,206,295 $1,006,593 
For the six months ended June 30,
2021% of
Total		2020% of
Total
United States industrial services:
Field services$416,351 88 %$529,942 88 %
Shop services54,194 12 %75,080 12 %
Total segment revenues$470,545 $605,022 
Total United States operations$4,485,106 $4,108,359 
For the six months ended June 30,
2021% of
Total		2020% of
Total
United Kingdom building services:
Service work$128,563 50 %$106,245 52 %
Project work128,046 50 %99,249 48 %
Total segment revenues$256,609 $205,494 
Total operations$4,741,715 $4,313,853 
Accounts Receivable, Allowance for Credit Losses
The change in the allowance for credit losses for the six months ended June 30, 2021 was as follows (in thousands):
Balance at December 31, 2020$18,031 
Provision for credit losses5,536 
Amounts written off against the allowance, net of recoveries(1,050)
Balance at June 30, 2021$22,517 
Contract Assets and Contract Liabilities
Net contract liabilities consisted of the following as of June 30, 2021 and December 31, 2020 (in thousands):
June 30,
2021		December 31, 2020
Contract assets, current$203,353 $171,956 
Contract assets, non-current— — 
Contract liabilities, current(769,959)(722,252)
Contract liabilities, non-current(2,535)(2,283)
Net contract liabilities$(569,141)$(552,579)
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 June 30, 2021 (in thousands, except for percentages):
June 30,
2021		% of Total
Remaining performance obligations:
United States electrical construction and facilities services$1,171,745 23 %
United States mechanical construction and facilities services2,926,387 57 %
United States building services733,832 14 %
United States industrial services125,970 3 %
Total United States operations4,957,934 97 %
United Kingdom building services148,794 3 %
Total operations$5,106,728 100 %
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 yearGreater than one year
Remaining performance obligations:
United States electrical construction and facilities services$994,558 $177,187 
United States mechanical construction and facilities services2,390,802 535,585 
United States building services672,324 61,508 
United States industrial services125,970 — 
Total United States operations4,183,654 774,280 
United Kingdom building services118,933 29,861 
Total operations$4,302,587 $804,141