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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2024
Segment Reporting [Abstract]  
Financial Information by Reportable Segment
The following tables present financial information for each of our reportable segments for the three months ended March 31, 2024 and 2023 (in thousands): 
 
For the three months ended
March 31,
 20242023
Revenues from unrelated entities:
United States electrical construction and facilities services$764,711 $644,746 
United States mechanical construction and facilities services1,427,665 1,078,558 
United States building services781,160 725,375 
United States industrial services354,053 330,883 
Total United States operations3,327,589 2,779,562 
United Kingdom building services104,687 110,870 
Total operations$3,432,276 $2,890,432 
Total revenues:
United States electrical construction and facilities services$766,739 $645,654 
United States mechanical construction and facilities services1,436,828 1,099,484 
United States building services803,873 748,610 
United States industrial services358,175 338,507 
Less intersegment revenues(38,026)(52,693)
Total United States operations3,327,589 2,779,562 
United Kingdom building services104,687 110,870 
Total operations$3,432,276 $2,890,432 

For the three months ended
March 31,
20242023
Operating income (loss):
United States electrical construction and facilities services$91,589 $40,516 
United States mechanical construction and facilities services150,720 86,227 
United States building services33,459 37,650 
United States industrial services17,966 15,020 
Total United States operations293,734 179,413 
United Kingdom building services5,377 5,424 
Corporate administration(39,158)(29,927)
Total operations259,953 154,910 
Other items:
Net periodic pension income (cost)
222 (274)
Interest income (expense), net
7,541 (1,832)
Income before income taxes$267,716 $152,804 
NOTE 14 - Segment Information (Continued)
March 31,
2024		December 31,
2023
Total assets:
United States electrical construction and facilities services$1,218,422 $1,243,707 
United States mechanical construction and facilities services2,258,381 2,242,833 
United States building services1,372,560 1,382,664 
United States industrial services592,464 571,658 
Total United States operations5,441,827 5,440,862 
United Kingdom building services278,147 277,066 
Corporate administration967,353 891,793 
Total operations$6,687,327 $6,609,721