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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2023
Segment Reporting [Abstract]  
Financial Information by Reportable Segment
The following tables present financial information for each of our reportable segments for the three and six months ended June 30, 2023 and 2022 (in thousands): 
 For the three months ended
June 30,
 20232022
Revenues from unrelated entities:
United States electrical construction and facilities services$678,167 $564,112 
United States mechanical construction and facilities services1,194,113 1,057,649 
United States building services775,012 686,545 
United States industrial services292,283 284,534 
Total United States operations2,939,575 2,592,840 
United Kingdom building services106,047 114,548 
Total operations$3,045,622 $2,707,388 
Total revenues:
United States electrical construction and facilities services$679,006 $566,029 
United States mechanical construction and facilities services1,209,242 1,064,925 
United States building services802,934 711,527 
United States industrial services293,057 287,440 
Less intersegment revenues(44,664)(37,081)
Total United States operations2,939,575 2,592,840 
United Kingdom building services106,047 114,548 
Total operations$3,045,622 $2,707,388 

 For the six months ended
June 30,
 20232022
Revenues from unrelated entities:
United States electrical construction and facilities services$1,322,913 $1,086,142 
United States mechanical construction and facilities services2,272,671 2,050,293 
United States building services1,500,387 1,322,172 
United States industrial services623,166 595,285 
Total United States operations5,719,137 5,053,892 
United Kingdom building services216,917 246,045 
Total operations$5,936,054 $5,299,937 
Total revenues:
United States electrical construction and facilities services$1,324,660 $1,089,443 
United States mechanical construction and facilities services2,308,726 2,061,955 
United States building services1,551,544 1,371,584 
United States industrial services631,564 611,941 
Less intersegment revenues(97,357)(81,031)
Total United States operations5,719,137 5,053,892 
United Kingdom building services216,917 246,045 
Total operations$5,936,054 $5,299,937 
NOTE 14 - Segment Information (Continued)
For the three months ended
June 30,
20232022
Operating income (loss):
United States electrical construction and facilities services$50,722 $35,095 
United States mechanical construction and facilities services119,847 76,612 
United States building services46,137 38,494 
United States industrial services7,887 6,458 
Total United States operations224,593 156,659 
United Kingdom building services5,927 6,415 
Corporate administration(33,853)(25,430)
Total operations196,667 137,644 
Other items:
Net periodic pension (cost) income(282)1,094 
Interest expense, net(2,692)(1,751)
Income before income taxes$193,693 $136,987 
For the six months ended
June 30,
20232022
Operating income (loss):
United States electrical construction and facilities services$91,238 $55,088 
United States mechanical construction and facilities services206,074 135,045 
United States building services83,787 62,657 
United States industrial services22,907 19,716 
Total United States operations404,006 272,506 
United Kingdom building services11,351 17,003 
Corporate administration(63,780)(51,908)
Total operations351,577 237,601 
Other items:
Net periodic pension (cost) income(556)2,263 
Interest expense, net(4,524)(3,040)
Income before income taxes$346,497 $236,824 
NOTE 14 - Segment Information (Continued)
June 30,
2023		December 31,
2022
Total assets:
United States electrical construction and facilities services$1,124,329 $1,078,405 
United States mechanical construction and facilities services2,049,168 1,835,001 
United States building services1,312,263 1,206,518 
United States industrial services566,959 552,545 
Total United States operations5,052,719 4,672,469 
United Kingdom building services268,845 255,547 
Corporate administration586,105 596,591 
Total operations$5,907,669 $5,524,607