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Revenue from Contracts with Customers (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2021 and 2020 (in thousands):
For the three months ended September 30,
2021% of
Total		2020% of
Total
United States electrical construction and facilities services:
Commercial market sector$274,954 52 %$252,197 53 %
Institutional market sector42,002 8 %36,230 8 %
Hospitality market sector2,522 1 %7,028 1 %
Manufacturing market sector60,965 11 %62,537 13 %
Healthcare market sector29,377 6 %16,929 4 %
Transportation market sector49,578 9 %58,765 12 %
Water and wastewater market sector4,381 1 %2,351 1 %
Short duration projects (1)
53,881 10 %31,008 7 %
Service work10,931 2 %6,847 1 %
528,591 473,892 
Less intersegment revenues(656)(1,808)
Total segment revenues$527,935 $472,084 

For the three months ended September 30,
2021% of
Total		2020% of
Total
United States mechanical construction and facilities services:
Commercial market sector$369,654 37 %$346,911 39 %
Institutional market sector74,867 8 %112,264 13 %
Hospitality market sector10,806 1 %12,570 1 %
Manufacturing market sector142,250 14 %93,919 11 %
Healthcare market sector123,071 12 %78,814 9 %
Transportation market sector23,954 3 %19,824 2 %
Water and wastewater market sector53,367 5 %45,255 5 %
Short duration projects (1)
82,510 8 %84,461 9 %
Service work121,013 12 %99,649 11 %
1,001,492 893,667 
Less intersegment revenues(1,908)(2,158)
Total segment revenues$999,584 $891,509 
 ________
(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 September 30,
2021% of
Total		2020% of
Total
United States building services:
Commercial site-based services$166,375 26 %$147,768 27 %
Government site-based services49,293 8 %44,664 8 %
Mobile mechanical services394,559 62 %341,279 61 %
Energy services22,228 4 %22,803 4 %
Total segment revenues$632,455 $556,514 
For the three months ended September 30,
2021% of
Total		2020% of
Total
United States industrial services:
Field services$196,846 85 %$145,165 85 %
Shop services35,372 15 %26,367 15 %
Total segment revenues$232,218 $171,532 
Total United States operations$2,392,192 $2,091,639 
For the three months ended September 30,
2021% of
Total		2020% of
Total
United Kingdom building services:
Service work$65,486 51 %$55,594 51 %
Project work63,994 49 %54,481 49 %
Total segment revenues$129,480 $110,075 
Total operations$2,521,672 $2,201,714 
For the nine months ended September 30,
2021% of
Total		2020% of
Total
United States electrical construction and facilities services:
Commercial market sector$773,711 52 %$704,361 52 %
Institutional market sector137,718 9 %106,314 8 %
Hospitality market sector11,286 1 %17,009 1 %
Manufacturing market sector161,386 11 %185,290 14 %
Healthcare market sector74,469 5 %52,179 4 %
Transportation market sector144,788 10 %150,911 11 %
Water and wastewater market sector9,909 1 %6,587 1 %
Short duration projects (1)
135,165 9 %104,785 8 %
Service work27,602 2 %20,293 1 %
1,476,034 1,347,729 
Less intersegment revenues(2,444)(3,454)
Total segment revenues$1,473,590 $1,344,275 
 ________
(1)Represents those projects which generally are completed within three months or less.
NOTE 3 - Revenue from Contracts with Customers (Continued)
For the nine months ended September 30,
2021% of
Total		2020% of
Total
United States mechanical construction and facilities services:
Commercial market sector$1,133,811 40 %$925,035 37 %
Institutional market sector215,635 8 %289,090 12 %
Hospitality market sector30,593 1 %29,382 1 %
Manufacturing market sector349,901 12 %310,109 12 %
Healthcare market sector357,601 12 %247,401 10 %
Transportation market sector63,075 2 %53,839 2 %
Water and wastewater market sector141,917 5 %131,374 5 %
Short duration projects (1)
254,897 9 %255,618 10 %
Service work320,031 11 %279,226 11 %
2,867,461 2,521,074 
Less intersegment revenues(5,266)(5,012)
Total segment revenues$2,862,195 $2,516,062 
 ________
(1)Represents those projects which generally are completed within three months or less.
For the nine months ended September 30,
2021% of
Total		2020% of
Total
United States building services:
Commercial site-based services$494,873 27 %$423,284 27 %
Government site-based services136,952 8 %126,000 8 %
Mobile mechanical services1,128,322 61 %943,729 61 %
Energy services78,603 4 %70,094 4 %
Total segment revenues$1,838,750 $1,563,107 
For the nine months ended September 30,
2021% of
Total		2020% of
Total
United States industrial services:
Field services$613,197 87 %$675,107 87 %
Shop services89,566 13 %101,447 13 %
Total segment revenues$702,763 $776,554 
Total United States operations$6,877,298 $6,199,998 
For the nine months ended September 30,
2021% of
Total		2020% of
Total
United Kingdom building services:
Service work$194,049 50 %$161,839 51 %
Project work192,040 50 %153,730 49 %
Total segment revenues$386,089 $315,569 
Total operations$7,263,387 $6,515,567 
Accounts Receivable, Allowance for Credit Losses
The change in the allowance for credit losses for the nine months ended September 30, 2021 was as follows (in thousands):
Balance at December 31, 2020$18,031 
Provision for credit losses5,829 
Amounts written off against the allowance, net of recoveries(1,233)
Balance at September 30, 2021$22,627 
Contract Assets and Contract Liabilities
Net contract liabilities consisted of the following as of September 30, 2021 and December 31, 2020 (in thousands):
September 30,
2021		December 31, 2020
Contract assets, current$245,489 $171,956 
Contract assets, non-current— — 
Contract liabilities, current(780,666)(722,252)
Contract liabilities, non-current(2,391)(2,283)
Net contract liabilities$(537,568)$(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 September 30, 2021 (in thousands, except for percentages):
September 30,
2021		% of Total
Remaining performance obligations:
United States electrical construction and facilities services$1,244,053 23 %
United States mechanical construction and facilities services3,037,573 56 %
United States building services810,619 15 %
United States industrial services143,299 3 %
Total United States operations5,235,544 97 %
United Kingdom building services143,202 3 %
Total operations$5,378,746 100 %
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$1,088,085 $155,968 
United States mechanical construction and facilities services2,466,793 570,780 
United States building services723,103 87,516 
United States industrial services143,299 — 
Total United States operations4,421,280 814,264 
United Kingdom building services116,512 26,690 
Total operations$4,537,792 $840,954