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Segment Information
 9 Months Ended
Sep. 30, 2022
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, industrial, utility, and institutional customers through approximately 90 operating subsidiaries, which specialize principally in providing construction services relating to electrical and mechanical systems in all types of facilities and in providing various services relating to the operation, maintenance, and management of those facilities. 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.
For a more complete description of our operations, refer to Item 1. Business of our Form 10-K for the year ended December 31, 2021.
NOTE 14 - Segment Information (continued)
Our reportable segments and related disclosures reflect certain reclassifications of prior year amounts from our United States mechanical construction and facilities services segment to our United States building services segment, and from our United States building services segment to our United States construction segments, due to changes in our internal reporting structure aimed at realigning our service offerings.
The following tables present financial information for each of our reportable segments for the three and nine months ended September 30, 2022 and 2021 (in thousands): 
 For the three months ended
September 30,
 20222021
Revenues from unrelated entities:
United States electrical construction and facilities services$633,383 $530,950 
United States mechanical construction and facilities services1,117,388 1,004,407 
United States building services710,650 624,617 
United States industrial services247,239 232,218 
Total United States operations2,708,660 2,392,192 
United Kingdom building services117,701 129,480 
Total operations$2,826,361 $2,521,672 
Total revenues:
United States electrical construction and facilities services$634,957 $531,735 
United States mechanical construction and facilities services1,133,895 1,007,993 
United States building services736,068 648,718 
United States industrial services266,182 232,479 
Less intersegment revenues(62,442)(28,733)
Total United States operations2,708,660 2,392,192 
United Kingdom building services117,701 129,480 
Total operations$2,826,361 $2,521,672 
NOTE 14 - Segment Information (continued)
 For the nine months ended
September 30,
 20222021
Revenues from unrelated entities:
United States electrical construction and facilities services$1,719,525 $1,482,475 
United States mechanical construction and facilities services3,184,205 2,887,572 
United States building services2,016,298 1,804,488 
United States industrial services842,524 702,763 
Total United States operations7,762,552 6,877,298 
United Kingdom building services363,746 386,089 
Total operations$8,126,298 $7,263,387 
Total revenues:
United States electrical construction and facilities services1,724,400 1,485,324 
United States mechanical construction and facilities services3,212,374 2,895,930 
United States building services2,091,128 1,876,141 
United States industrial services878,123 730,851 
Less intersegment revenues(143,473)(110,948)
Total United States operations7,762,552 6,877,298 
United Kingdom building services363,746 386,089 
Total operations$8,126,298 $7,263,387 
For the three months ended
September 30,
20222021
Operating income (loss):
United States electrical construction and facilities services$35,558 $44,284 
United States mechanical construction and facilities services90,952 80,797 
United States building services45,589 32,865 
United States industrial services(1,392)(3,012)
Total United States operations170,707 154,934 
United Kingdom building services8,369 6,582 
Corporate administration(28,982)(24,095)
Total operations150,094 137,421 
Other items:
Net periodic pension (cost) income1,025 908 
Interest expense, net(3,194)(1,286)
Income before income taxes$147,925 $137,043 
NOTE 14 - Segment Information (continued)
For the nine months ended
September 30,
20222021
Operating income (loss):
United States electrical construction and facilities services$90,646 $127,548 
United States mechanical construction and facilities services226,571 220,697 
United States building services107,672 96,523 
United States industrial services18,324 (5,663)
Total United States operations443,213 439,105 
United Kingdom building services25,372 23,040 
Corporate administration(80,890)(74,362)
Total operations387,695 387,783 
Other items:
Net periodic pension (cost) income3,288 2,738 
Interest expense, net(6,234)(3,965)
Income before income taxes$384,749 $386,556 
September 30,
2022		December 31,
2021
Total assets:
United States electrical construction and facilities services$1,075,648 $855,417 
United States mechanical construction and facilities services1,825,503 1,672,546 
United States building services1,201,947 1,089,844 
United States industrial services583,411 589,017 
Total United States operations4,686,509 4,206,824 
United Kingdom building services230,330 241,740 
Corporate administration521,890 992,882 
Total operations$5,438,729 $5,441,446