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Revenue from Contracts with Customers (Tables)
 3 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
Cumulative Catch-Up Adjustment
Based on an evaluation of individual projects that had revisions to total estimated costs or anticipated contract value, which resulted in a reduction of profitability in excess of $1.0 million, our operating results were negatively impacted during the three months ended March 31, 2024 and 2023, as summarized in the following table (in thousands):
 
For the three months ended
March 31,
 20242023
United States electrical construction and facilities services$5,319 $5,232 
United States mechanical construction and facilities services3,653 1,164 
Total impact$8,972 $6,396 
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 months ended March 31, 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 March 31,
2024% of
Total		2023% of
Total
United States electrical construction and facilities services:
Network and communications market sector$309,540 40 %$213,751 33 %
Commercial market sector93,448 12 %97,098 15 %
Manufacturing and industrial market sector100,551 13 %85,241 13 %
Healthcare market sector53,380 7 %55,503 9 %
High-tech manufacturing market sector35,243 4 %30,554 5 %
Institutional market sector38,070 5 %37,411 6 %
Transportation market sector43,624 6 %33,902 5 %
Water and wastewater market sector4,207 1 %7,458 1 %
Hospitality and entertainment market sector21,955 3 %20,052 3 %
Short duration projects (1)
51,059 7 %47,680 7 %
Service work14,125 2 %16,877 3 %
765,202 645,527 
Less intersegment revenues(491)(781)
Total segment revenues$764,711 $644,746 
 ________
(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 March 31,
2024% of
Total		2023% of
Total
United States mechanical construction and facilities services:
Network and communications market sector$131,081 9 %$99,421 9 %
Commercial market sector259,770 18 %255,846 24 %
Manufacturing and industrial market sector187,726 13 %141,635 13 %
Healthcare market sector117,253 8 %112,728 10 %
High-tech manufacturing market sector310,930 22 %116,796 11 %
Institutional market sector98,354 7 %64,048 6 %
Transportation market sector14,012 1 %12,218 1 %
Water and wastewater market sector63,434 5 %68,662 6 %
Hospitality and entertainment market sector12,855 1 %10,077 1 %
Short duration projects (1)
105,216 7 %81,417 8 %
Service work128,350 9 %117,188 11 %
1,428,981 1,080,036 
Less intersegment revenues(1,316)(1,478)
Total segment revenues$1,427,665 $1,078,558 
 ________
(1)Represents those projects which generally are completed within three months or less.
For the three months ended March 31,
2024% of
Total		2023% of
Total
United States building services:
Mechanical services$514,148 66 %$462,534 64 %
Commercial site-based services218,629 28 %209,371 29 %
Government site-based services48,383 6 %53,470 7 %
Total segment revenues$781,160 $725,375 
For the three months ended March 31,
2024% of
Total		2023% of
Total
United States industrial services:
Field services$309,801 88 %$285,844 86 %
Shop services44,252 12 %45,039 14 %
Total segment revenues$354,053 $330,883 
Total United States operations$3,327,589 $2,779,562 
For the three months ended March 31,
2024% of
Total		2023% of
Total
United Kingdom building services:
Service work$49,844 48 %$51,663 47 %
Project work54,843 52 %59,207 53 %
Total segment revenues$104,687 $110,870 
Total operations$3,432,276 $2,890,432 
Accounts Receivable, Allowance for Credit Losses
The change in the allowance for credit losses for the three months ended March 31, 2024 was as follows (in thousands):
Balance at December 31, 2023
$22,502 
Provision for credit losses9,898 
Amounts written off against the allowance, net of recoveries
(1,036)
Balance at March 31, 2024
$31,364 
Contract Assets and Contract Liabilities
Net contract liabilities in the accompanying Consolidated Balance Sheets consisted of the following amounts as of March 31, 2024 and December 31, 2023 (in thousands):
March 31,
2024		December 31, 2023
Contract assets, current$267,611 $269,885 
Contract assets, non-current— — 
Contract liabilities, current(1,649,207)(1,595,109)
Contract liabilities, non-current(1,776)(1,812)
Net contract liabilities$(1,383,372)$(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 March 31, 2024 (in thousands, except for percentages):
March 31,
2024		% of Total
Remaining performance obligations:
United States electrical construction and facilities services$2,551,430 28 %
United States mechanical construction and facilities services4,997,257 54 %
United States building services1,351,585 15 %
United States industrial services111,935 1 %
Total United States operations9,012,207 98 %
United Kingdom building services163,145 2 %
Total operations$9,175,352 100 %
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$2,120,190 $431,240 
United States mechanical construction and facilities services4,296,296 700,961 
United States building services1,217,565 134,020 
United States industrial services111,935 — 
Total United States operations7,745,986 1,266,221 
United Kingdom building services121,604 41,541 
Total operations$7,867,590 $1,307,762