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Revenue from Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 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, for the three and six months ended June 30, 2022 and 2021 (in thousands):
For the three months ended June 30,
2022% of
Total		2021% of
Total
United States electrical construction and facilities services:
Commercial market sector$299,206 53 %$254,456 51 %
Manufacturing market sector65,304 11 %52,114 10 %
Healthcare market sector43,278 8 %25,847 5 %
Institutional market sector37,689 7 %53,181 11 %
Transportation market sector42,440 7 %53,179 11 %
Water and wastewater market sector5,184 1 %1,877 1 %
Hospitality market sector2,689 1 %4,100 1 %
Short duration projects (1)
52,868 9 %38,173 8 %
Service work17,095 3 %9,810 2 %
565,753 492,737 
Less intersegment revenues(1,641)(607)
Total segment revenues$564,112 $492,130 
 ________
(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,
2022% of
Total		2021% of
Total
United States mechanical construction and facilities services:
Commercial market sector$401,778 38 %$396,824 41 %
Manufacturing market sector155,290 14 %118,109 12 %
Healthcare market sector127,253 12 %121,412 13 %
Institutional market sector92,440 9 %71,464 7 %
Transportation market sector16,246 1 %20,704 2 %
Water and wastewater market sector67,746 6 %44,702 5 %
Hospitality market sector8,300 1 %11,258 1 %
Short duration projects (1)
85,216 8 %81,829 8 %
Service work114,707 11 %103,557 11 %
1,068,976 969,859 
Less intersegment revenues(2,629)(1,195)
Total segment revenues$1,066,347 $968,664 
 ________
(1)Represents those projects which generally are completed within three months or less.
For the three months ended June 30,
2022% of
Total		2021% of
Total
United States building services:
Mobile mechanical services$439,326 65 %$412,397 67 %
Commercial site-based services193,082 28 %152,851 25 %
Government site-based services45,439 7 %46,587 8 %
Total segment revenues$677,847 $611,835 
For the three months ended June 30,
2022% of
Total		2021% of
Total
United States industrial services:
Field services$247,542 87 %$208,797 89 %
Shop services36,992 13 %26,366 11 %
Total segment revenues$284,534 $235,163 
Total United States operations$2,592,840 $2,307,792 
For the three months ended June 30,
2022% of
Total		2021% of
Total
United Kingdom building services:
Service work$54,261 47 %$66,572 51 %
Project work60,287 53 %63,302 49 %
Total segment revenues$114,548 $129,874 
Total operations$2,707,388 $2,437,666 
NOTE 3 - Revenue from Contracts with Customers (Continued)
For the six months ended June 30,
2022% of
Total		2021% of
Total
United States electrical construction and facilities services:
Commercial market sector$569,521 52 %$500,297 52 %
Manufacturing market sector131,769 12 %100,568 10 %
Healthcare market sector75,348 7 %45,998 5 %
Institutional market sector69,455 6 %96,820 10 %
Transportation market sector87,522 8 %95,210 10 %
Water and wastewater market sector10,496 1 %5,528 1 %
Hospitality market sector5,312 1 %8,764 1 %
Short duration projects (1)
108,916 10 %82,582 9 %
Service work30,424 3 %17,575 2 %
1,088,763 953,342 
Less intersegment revenues(2,621)(1,817)
Total segment revenues$1,086,142 $951,525 
For the six months ended June 30,
2022% of
Total		2021% of
Total
United States mechanical construction and facilities services:
Commercial market sector$781,382 38 %$763,301 41 %
Manufacturing market sector304,861 15 %239,795 13 %
Healthcare market sector247,304 12 %234,068 12 %
Institutional market sector163,067 8 %140,768 7 %
Transportation market sector32,299 1 %39,121 2 %
Water and wastewater market sector129,490 6 %88,550 5 %
Hospitality market sector16,379 1 %19,787 1 %
Short duration projects (1)
180,310 9 %168,594 9 %
Service work216,622 10 %192,047 10 %
2,071,714 1,886,031 
Less intersegment revenues(4,897)(2,866)
Total segment revenues$2,066,817 $1,883,165 
________
(1)Represents those projects which generally are completed within three months or less.
For the six months ended June 30,
2022% of
Total		2021% of
Total
United States building services:
Mobile mechanical services$812,897 62 %$763,714 65 %
Commercial site-based services396,632 31 %328,498 28 %
Government site-based services96,119 7 %87,659 7 %
Total segment revenues$1,305,648 $1,179,871 
NOTE 3 - Revenue from Contracts with Customers (Continued)
For the six months ended June 30,
2022% of
Total		2021% of
Total
United States industrial services:
Field services$518,960 87 %$416,351 88 %
Shop services76,325 13 %54,194 12 %
Total segment revenues$595,285 $470,545 
Total United States operations$5,053,892 $4,485,106 
For the six months ended June 30,
2022% of
Total		2021% of
Total
United Kingdom building services:
Service work$119,078 48 %$128,563 50 %
Project work126,967 52 %128,046 50 %
Total segment revenues$246,045 $256,609 
Total operations$5,299,937 $4,741,715 
Accounts Receivable, Allowance for Credit Losses
The change in the allowance for credit losses for the six months ended June 30, 2022 was as follows (in thousands):
Balance at December 31, 2021$23,534 
Provision for credit losses1,561 
Amounts written off against the allowance, net of recoveries(1,226)
Balance at June 30, 2022$23,869 
Contract Assets and Contract Liabilities
Net contract liabilities in the accompanying Consolidated Balance Sheets consisted of the following as of June 30, 2022 and December 31, 2021 (in thousands):
June 30,
2022		December 31, 2021
Contract assets, current$264,764 $230,143 
Contract assets, non-current— — 
Contract liabilities, current(925,733)(788,134)
Contract liabilities, non-current(1,609)(2,505)
Net contract liabilities$(662,578)$(560,496)
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, 2022 (in thousands, except for percentages):
June 30,
2022		% of Total
Remaining performance obligations:
United States electrical construction and facilities services$1,537,344 24 %
United States mechanical construction and facilities services3,566,879 55 %
United States building services1,070,734 17 %
United States industrial services130,763 2 %
Total United States operations6,305,720 98 %
United Kingdom building services155,412 2 %
Total operations$6,461,132 100 %
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$1,380,133 $157,211 
United States mechanical construction and facilities services2,906,302 660,577 
United States building services967,580 103,154 
United States industrial services130,763 — 
Total United States operations5,384,778 920,942 
United Kingdom building services132,498 22,914 
Total operations$5,517,276 $943,856