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Segment Information
 6 Months Ended
Jun. 30, 2024
Segment Reporting [Abstract]  
Segment Information Segment Information
We are one of the largest specialty contractors in the United States and a leading provider of electrical and mechanical construction and facilities services, building services, and industrial services. Our services are provided to a broad range of commercial, technology, manufacturing, industrial, healthcare, utility, and institutional customers through approximately 100 operating subsidiaries. Such operating subsidiaries are organized into the following reportable segments:
•United States electrical construction and facilities services;
•United States mechanical construction and facilities services;
•United States building services;
•United States industrial services; and
•United Kingdom building services.
The following tables present financial information for each of our reportable segments for the three and six months ended June 30, 2024 and 2023 (in thousands): 
 
For the three months ended
June 30,
 20242023
Revenues from unrelated entities:
United States electrical construction and facilities services$799,994 $678,167 
United States mechanical construction and facilities services1,655,181 1,194,113 
United States building services781,108 775,012 
United States industrial services324,047 292,283 
Total United States operations3,560,330 2,939,575 
United Kingdom building services106,567 106,047 
Total operations$3,666,897 $3,045,622 
Total revenues:
United States electrical construction and facilities services$802,884 $679,006 
United States mechanical construction and facilities services1,669,887 1,209,242 
United States building services792,277 802,934 
United States industrial services326,312 293,057 
Less intersegment revenues(31,030)(44,664)
Total United States operations3,560,330 2,939,575 
United Kingdom building services106,567 106,047 
Total operations$3,666,897 $3,045,622 
NOTE 14 - Segment Information (Continued)
 
For the six months ended
June 30,
 20242023
Revenues from unrelated entities:
United States electrical construction and facilities services$1,564,705 $1,322,913 
United States mechanical construction and facilities services3,082,846 2,272,671 
United States building services1,562,268 1,500,387 
United States industrial services678,100 623,166 
Total United States operations6,887,919 5,719,137 
United Kingdom building services211,254 216,917 
Total operations$7,099,173 $5,936,054 
Total revenues:
United States electrical construction and facilities services$1,569,623 $1,324,660 
United States mechanical construction and facilities services3,106,715 2,308,726 
United States building services1,596,150 1,551,544 
United States industrial services684,487 631,564 
Less intersegment revenues(69,056)(97,357)
Total United States operations6,887,919 5,719,137 
United Kingdom building services211,254 216,917 
Total operations$7,099,173 $5,936,054 


For the three months ended
June 30,
20242023
Operating income (loss):
United States electrical construction and facilities services$88,577 $50,722 
United States mechanical construction and facilities services213,440 119,847 
United States building services46,839 46,137 
United States industrial services12,746 7,887 
Total United States operations361,602 224,593 
United Kingdom building services5,777 5,927 
Corporate administration(34,571)(33,853)
Total operations332,808 196,667 
Other items:
Net periodic pension income (cost)
221 (282)
Interest income (expense), net
6,106 (2,692)
Income before income taxes$339,135 $193,693 
NOTE 14 - Segment Information (Continued)
For the six months ended
June 30,
20242023
Operating income (loss):
United States electrical construction and facilities services$180,166 $91,238 
United States mechanical construction and facilities services364,160 206,074 
United States building services80,298 83,787 
United States industrial services30,712 22,907 
Total United States operations655,336 404,006 
United Kingdom building services11,154 11,351 
Corporate administration(73,729)(63,780)
Total operations592,761 351,577 
Other items:
Net periodic pension income (cost)
443 (556)
Interest income (expense), net
13,647 (4,524)
Income before income taxes$606,851 $346,497 

June 30,
2024		December 31,
2023
Total assets:
United States electrical construction and facilities services$1,242,145 $1,243,707 
United States mechanical construction and facilities services2,599,846 2,242,833 
United States building services1,424,862 1,382,664 
United States industrial services637,802 571,658 
Total United States operations5,904,655 5,440,862 
United Kingdom building services275,714 277,066 
Corporate administration892,180 891,793 
Total operations$7,072,549 $6,609,721