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Segment Information
 9 Months Ended
Sep. 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 nine months ended September 30, 2024 and 2023 (in thousands): 
 
For the three months ended
September 30,
 20242023
Revenues from unrelated entities:
United States electrical construction and facilities services$845,030 $697,406 
United States mechanical construction and facilities services1,662,211 1,329,600 
United States building services796,923 817,718 
United States industrial services286,410 252,148 
Total United States operations3,590,574 3,096,872 
United Kingdom building services106,350 110,726 
Total operations$3,696,924 $3,207,598 
Total revenues:
United States electrical construction and facilities services$850,587 $697,897 
United States mechanical construction and facilities services1,676,341 1,342,149 
United States building services806,448 846,400 
United States industrial services286,611 252,244 
Less intersegment revenues(29,413)(41,818)
Total United States operations3,590,574 3,096,872 
United Kingdom building services106,350 110,726 
Total operations$3,696,924 $3,207,598 
NOTE 14 - Segment Information (Continued)
 
For the nine months ended
September 30,
 20242023
Revenues from unrelated entities:
United States electrical construction and facilities services$2,409,735 $2,020,319 
United States mechanical construction and facilities services4,745,057 3,602,271 
United States building services2,359,191 2,318,105 
United States industrial services964,510 875,314 
Total United States operations10,478,493 8,816,009 
United Kingdom building services317,604 327,643 
Total operations$10,796,097 $9,143,652 
Total revenues:
United States electrical construction and facilities services$2,420,210 $2,022,557 
United States mechanical construction and facilities services4,783,056 3,650,875 
United States building services2,402,598 2,397,944 
United States industrial services971,098 883,808 
Less intersegment revenues(98,469)(139,175)
Total United States operations10,478,493 8,816,009 
United Kingdom building services317,604 327,643 
Total operations$10,796,097 $9,143,652 


For the three months ended
September 30,
20242023
Operating income (loss):
United States electrical construction and facilities services$119,118 $63,127 
United States mechanical construction and facilities services214,831 138,476 
United States building services55,562 57,156 
United States industrial services3,292 (174)
Total United States operations392,803 258,585 
United Kingdom building services5,497 8,869 
Corporate administration(34,762)(30,121)
Impairment loss on long-lived assets— (2,350)
Total operations363,538 234,983 
Other items:
Net periodic pension income (cost)227 (284)
Interest income (expense), net8,312 (90)
Income before income taxes$372,077 $234,609 
NOTE 14 - Segment Information (Continued)
For the nine months ended
September 30,
20242023
Operating income (loss):
United States electrical construction and facilities services$299,284 $154,365 
United States mechanical construction and facilities services578,991 344,550 
United States building services135,860 140,943 
United States industrial services34,004 22,733 
Total United States operations1,048,139 662,591 
United Kingdom building services16,651 20,220 
Corporate administration(108,491)(93,901)
Impairment loss on long-lived assets— (2,350)
Total operations956,299 586,560 
Other items:
Net periodic pension income (cost)670 (840)
Interest income (expense), net21,959 (4,614)
Income before income taxes$978,928 $581,106 

September 30,
2024		December 31,
2023
Total assets:
United States electrical construction and facilities services$1,240,898 $1,243,707 
United States mechanical construction and facilities services2,644,195 2,242,833 
United States building services1,422,089 1,382,664 
United States industrial services614,187 571,658 
Total United States operations5,921,369 5,440,862 
United Kingdom building services297,440 277,066 
Corporate administration1,103,143 891,793 
Total operations$7,321,952 $6,609,721