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Revenue from Contracts with Customers (Tables)
 3 Months Ended
Mar. 31, 2023
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 months ended March 31, 2023 and 2022 (in thousands). 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.
Due to continued growth in certain of our end markets, beginning with the first quarter of 2023, we have expanded the market sectors included in the disclosure for each of our United States construction segments, as shown below. All prior period disclosures have been adjusted to additionally reflect these changes.
For the three months ended March 31,
2023% of
Total		2022% of
Total
United States electrical construction and facilities services:
Network and communications market sector$213,751 33 %$145,374 28 %
Commercial market sector97,098 15 %101,841 19 %
Manufacturing and industrial market sector85,241 13 %66,465 13 %
Healthcare market sector55,503 9 %32,070 6 %
High-tech manufacturing market sector30,554 5 %19,869 4 %
Institutional market sector37,411 6 %31,766 6 %
Transportation market sector33,902 5 %45,082 9 %
Water and wastewater market sector7,458 1 %5,312 1 %
Hospitality and entertainment market sector20,052 3 %5,854 1 %
Short duration projects (1)
47,680 7 %56,048 11 %
Service work16,877 3 %13,329 2 %
645,527 523,010 
Less intersegment revenues(781)(980)
Total segment revenues$644,746 $522,030 

For the three months ended March 31,
2023% of
Total		2022% of
Total
United States mechanical construction and facilities services:
Network and communications market sector$99,421 9 %$55,634 6 %
Commercial market sector255,846 24 %261,500 26 %
Manufacturing and industrial market sector141,635 13 %149,571 15 %
Healthcare market sector112,728 10 %119,832 12 %
High-tech manufacturing market sector116,796 11 %57,573 6 %
Institutional market sector64,048 6 %65,922 7 %
Transportation market sector12,218 1 %16,053 2 %
Water and wastewater market sector68,662 6 %61,744 6 %
Hospitality and entertainment market sector10,077 1 %12,780 1 %
Short duration projects (1)
81,417 8 %93,559 9 %
Service work117,188 11 %100,744 10 %
1,080,036 994,912 
Less intersegment revenues(1,478)(2,268)
Total segment revenues$1,078,558 $992,644 
 ________
(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,
2023% of
Total		2022% of
Total
United States building services:
Mechanical services$462,534 64 %$381,397 60 %
Commercial site-based services209,371 29 %203,550 32 %
Government site-based services53,470 7 %50,680 8 %
Total segment revenues$725,375 $635,627 
For the three months ended March 31,
2023% of
Total		2022% of
Total
United States industrial services:
Field services$285,844 86 %$271,418 87 %
Shop services45,039 14 %39,333 13 %
Total segment revenues$330,883 $310,751 
Total United States operations$2,779,562 $2,461,052 
For the three months ended March 31,
2023% of
Total		2022% of
Total
United Kingdom building services:
Service work$51,663 47 %$64,817 49 %
Project work59,207 53 %66,680 51 %
Total segment revenues$110,870 $131,497 
Total operations$2,890,432 $2,592,549 
Accounts Receivable, Allowance for Credit Losses
The change in the allowance for credit losses for the three months ended March 31, 2023 was as follows (in thousands):
Balance at December 31, 2022$22,382 
Recovery of credit losses(343)
Net amounts written off against the allowance(211)
Balance at March 31, 2023$21,828 
Contract Assets and Contract Liabilities
Net contract liabilities in the accompanying Consolidated Balance Sheets consisted of the following as of March 31, 2023 and December 31, 2022 (in thousands):
March 31,
2023		December 31, 2022
Contract assets, current$302,750 $273,176 
Contract assets, non-current— — 
Contract liabilities, current(1,156,530)(1,098,263)
Contract liabilities, non-current(2,221)(2,273)
Net contract liabilities$(856,001)$(827,360)
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, 2023 (in thousands, except for percentages):
March 31,
2023		% of Total
Remaining performance obligations:
United States electrical construction and facilities services$2,050,956 26 %
United States mechanical construction and facilities services4,295,524 54 %
United States building services1,254,787 16 %
United States industrial services131,759 2 %
Total United States operations7,733,026 98 %
United Kingdom building services140,117 2 %
Total operations$7,873,143 100 %
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$1,626,520 $424,436 
United States mechanical construction and facilities services3,422,159 873,365 
United States building services1,115,438 139,349 
United States industrial services129,386 2,373 
Total United States operations6,293,503 1,439,523 
United Kingdom building services95,121 44,996 
Total operations$6,388,624 $1,484,519