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Revenue from Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 2024
Revenue from Contract with Customer [Abstract]  
Performance Obligation Satisfied In Previous Period
Based on an evaluation of individual projects that were substantially complete in prior periods but had revisions to total estimated cost or anticipated contract value that resulted in an increase to profitability in excess of $1.0 million, we recognized revenue during the three and six months ended June 30, 2024 and 2023, as summarized in the following table (in thousands):
 
For the three months ended
June 30,
For the six months ended
June 30,
 2024202320242023
United States electrical construction and facilities services$3,076 $— $8,413 $— 
United States mechanical construction and facilities services9,540 8,036 8,461 8,999 
Total impact$12,616 $8,036 $16,874 $8,999 
Cumulative Catch-Up Adjustment
Based on an evaluation of individual projects that had revisions to total estimated costs or anticipated contract value that resulted in a reduction of profitability in excess of $1.0 million, our operating results were negatively impacted during the three and six months ended June 30, 2024 and 2023, as summarized in the following table (in thousands):
 
For the three months ended
June 30,
For the six months ended
June 30,
 2024202320242023
United States electrical construction and facilities services$12,292 $2,616 $16,485 $8,345 
United States mechanical construction and facilities services7,886 — 14,620 2,686 
United States building services
— 1,084 — 1,544 
Total impact$20,178 $3,700 $31,105 $12,575 
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, 2024 and 2023 (in thousands, except for percentages). Refer to Note 14 - Segment Information of the notes to consolidated financial statements for additional information on how we disaggregate our revenues by reportable segment.

For the three months ended June 30,
2024% of
Total		2023% of
Total
United States electrical construction and facilities services:
Network and communications market sector$325,021 40 %$215,288 32 %
Commercial market sector69,551 9 %93,820 14 %
Manufacturing and industrial market sector103,375 13 %95,883 14 %
Healthcare market sector61,577 8 %64,813 9 %
High-tech manufacturing market sector53,103 7 %38,039 6 %
Institutional market sector38,501 5 %37,250 5 %
Transportation market sector56,357 7 %41,247 6 %
Water and wastewater market sector11,092 1 %4,603 1 %
Hospitality and entertainment market sector16,353 2 %19,750 3 %
Short-duration projects (1)
51,224 6 %50,740 7 %
Service work15,433 2 %17,276 3 %
801,587 678,709 
Less intersegment revenues(1,593)(542)
Total segment revenues$799,994 $678,167 
 ________
(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,
2024% of
Total		2023% of
Total
United States mechanical construction and facilities services:
Network and communications market sector$174,623 11 %$87,034 7 %
Commercial market sector272,368 16 %289,304 24 %
Manufacturing and industrial market sector204,649 12 %166,051 14 %
Healthcare market sector156,171 9 %117,842 10 %
High-tech manufacturing market sector376,876 23 %177,653 15 %
Institutional market sector126,030 8 %71,626 6 %
Transportation market sector15,650 1 %9,229 1 %
Water and wastewater market sector87,009 5 %67,286 6 %
Hospitality and entertainment market sector16,775 1 %13,531 1 %
Short-duration projects (1)
77,615 5 %73,978 6 %
Service work149,165 9 %122,278 10 %
1,656,931 1,195,812 
Less intersegment revenues(1,750)(1,699)
Total segment revenues$1,655,181 $1,194,113 
 ________
(1)Represents those projects which generally are completed within three months or less.
For the three months ended June 30,
2024% of
Total		2023% of
Total
United States building services:
Mechanical services$581,735 75 %$514,505 66 %
Commercial site-based services151,872 19 %207,323 27 %
Government site-based services47,501 6 %53,184 7 %
Total segment revenues$781,108 $775,012 
For the three months ended June 30,
2024% of
Total		2023% of
Total
United States industrial services:
Field services$275,871 85 %$250,877 86 %
Shop services48,176 15 %41,406 14 %
Total segment revenues$324,047 $292,283 
Total United States operations$3,560,330 $2,939,575 
For the three months ended June 30,
2024% of
Total		2023% of
Total
United Kingdom building services:
Service work$51,160 48 %$51,682 49 %
Project work55,407 52 %54,365 51 %
Total segment revenues$106,567 $106,047 
Total operations$3,666,897 $3,045,622 
NOTE 3 - Revenue from Contracts with Customers (Continued)
For the six months ended June 30,
2024% of
Total		2023% of
Total
United States electrical construction and facilities services:
Network and communications market sector$634,561 41 %$429,039 32 %
Commercial market sector162,999 10 %190,918 14 %
Manufacturing and industrial market sector203,926 13 %181,124 14 %
Healthcare market sector114,957 7 %120,316 9 %
High-tech manufacturing market sector88,346 6 %68,593 5 %
Institutional market sector76,571 5 %74,661 6 %
Transportation market sector99,981 6 %75,149 6 %
Water and wastewater market sector15,299 1 %12,061 1 %
Hospitality and entertainment market sector38,308 2 %39,802 3 %
Short-duration projects (1)
102,283 7 %98,420 7 %
Service work29,558 2 %34,153 3 %
1,566,789 1,324,236 
Less intersegment revenues(2,084)(1,323)
Total segment revenues$1,564,705 $1,322,913 
________
(1)Represents those projects which generally are completed within three months or less.

For the six months ended June 30,
2024% of
Total		2023% of
Total
United States mechanical construction and facilities services:
Network and communications market sector$305,704 10 %$186,455 8 %
Commercial market sector532,138 17 %545,150 24 %
Manufacturing and industrial market sector392,375 13 %307,686 13 %
Healthcare market sector273,424 9 %230,570 10 %
High-tech manufacturing market sector687,806 22 %294,449 13 %
Institutional market sector224,384 7 %135,674 6 %
Transportation market sector29,662 1 %21,447 1 %
Water and wastewater market sector150,443 5 %135,948 6 %
Hospitality and entertainment market sector29,630 1 %23,608 1 %
Short-duration projects (1)
182,831 6 %155,395 7 %
Service work277,515 9 %239,466 11 %
3,085,912 2,275,848 
Less intersegment revenues(3,066)(3,177)
Total segment revenues$3,082,846 $2,272,671 
________
(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,
2024% of
Total		2023% of
Total
United States building services:
Mechanical services$1,095,883 70 %$977,039 65 %
Commercial site-based services370,501 24 %416,694 28 %
Government site-based services95,884 6 %106,654 7 %
Total segment revenues$1,562,268 $1,500,387 
For the six months ended June 30,
2024% of
Total		2023% of
Total
United States industrial services:
Field services$585,672 86 %$536,721 86 %
Shop services92,428 14 %86,445 14 %
Total segment revenues$678,100 $623,166 
Total United States operations$6,887,919 $5,719,137 
For the six months ended June 30,
2024% of
Total		2023% of
Total
United Kingdom building services:
Service work$101,004 48 %$103,345 48 %
Project work110,250 52 %113,572 52 %
Total segment revenues$211,254 $216,917 
Total operations$7,099,173 $5,936,054 
Accounts Receivable, Allowance for Credit Losses
The change in the allowance for credit losses for the six months ended June 30, 2024 was as follows (in thousands):
Balance at December 31, 2023
$22,502 
Provision for credit losses12,251 
Amounts written off against the allowance, net of recoveries
(1,502)
Balance at June 30, 2024
$33,251 
Contract Assets and Contract Liabilities
Net contract liabilities in the accompanying Consolidated Balance Sheets consisted of the following amounts as of June 30, 2024 and December 31, 2023 (in thousands):
June 30,
2024		December 31, 2023
Contract assets, current$293,677 $269,885 
Contract assets, non-current— — 
Contract liabilities, current(1,783,909)(1,595,109)
Contract liabilities, non-current(1,667)(1,812)
Net contract liabilities$(1,491,899)$(1,327,036)
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, 2024 (in thousands, except for percentages):
June 30,
2024		% of Total
Remaining performance obligations:
United States electrical construction and facilities services$2,632,120 29 %
United States mechanical construction and facilities services4,758,744 53 %
United States building services1,345,089 15 %
United States industrial services99,022 1 %
Total United States operations8,834,975 98 %
United Kingdom building services164,248 2 %
Total operations$8,999,223 100 %
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$2,161,670 $470,450 
United States mechanical construction and facilities services4,131,577 627,167 
United States building services1,218,420 126,669 
United States industrial services99,022 — 
Total United States operations7,610,689 1,224,286 
United Kingdom building services125,105 39,143 
Total operations$7,735,794 $1,263,429