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Segment Information
 9 Months Ended
Sep. 30, 2021
Segment Reporting [Abstract]  
Segment Information Segment Information
We have the following reportable segments: (a) United States electrical construction and facilities services (involving systems for electrical power transmission, distribution, and generation, including sustainable energy solutions such as solar, photovoltaic, and wind; premises electrical and lighting systems; process instrumentation in the refining, chemical processing, and food processing industries; low-voltage systems, such as fire alarm, security, and process control; voice and data communication, including fiber-optic and low-voltage cabling, distributed antenna systems, and audiovisual systems; roadway and transit lighting and signaling; and fiber optic lines); (b) United States mechanical construction and facilities services (involving systems for heating, ventilation, air conditioning, refrigeration, and clean-room process ventilation; fire protection; plumbing, process, and high-purity piping; controls and filtration; water and wastewater treatment; central plant heating and cooling; cranes and rigging; millwrighting; and steel fabrication, erection, and welding); (c) United States building services; (d) United States industrial services; and (e) United Kingdom building services. The “United States building services” and “United Kingdom building services” segments principally consist of those operations which provide a portfolio of services needed to support the operation and maintenance of customers’ facilities, including commercial and government site-based operations and maintenance; facility management, maintenance, and services; outage services to utilities and industrial plants; military base operations support services; mobile mechanical maintenance and services, including maintenance and service of mechanical, electrical, plumbing, and building automation systems; indoor air quality improvement services; floor care and janitorial services; landscaping, lot sweeping, and snow removal; other building services, including reception, security, and catering; vendor management; call center services; installation and support for building systems; program development, management, and maintenance for energy systems, including services aimed at assisting our customers in reducing energy consumption; technical consulting and diagnostic services; infrastructure and building projects for federal, state, and local governmental agencies and bodies; and small modification and retrofit projects, which services are not generally related to customers’ construction programs. The “United States industrial services” segment principally consists of those operations which provide industrial maintenance and services for refineries, petrochemical plants, and other customers within the oil and gas industry. Services of this segment include refinery turnaround planning and engineering; specialty welding; overhaul and maintenance of critical process units; specialty technical services; instrumentation and electrical services for energy infrastructure; on-site repairs, maintenance, and service of heat exchangers, towers, vessels, and piping; and design, manufacturing, repair, and hydroblast cleaning of shell and tube heat exchangers and related equipment.
Our reportable segments reflect certain reclassifications of prior year amounts from our United States electrical construction and facilities services segment to our United States industrial services and our United States building services segments due to changes in our internal reporting structure aimed at realigning our service offerings.
NOTE 15 - Segment Information (Continued)
The following tables present financial information for each of our reportable segments for the three and nine months ended September 30, 2021 and 2020 (in thousands): 
 For the three months ended
September 30,
 20212020
Revenues from unrelated entities:
United States electrical construction and facilities services$527,935 $472,084 
United States mechanical construction and facilities services999,584 891,509 
United States building services632,455 556,514 
United States industrial services232,218 171,532 
Total United States operations2,392,192 2,091,639 
United Kingdom building services129,480 110,075 
Total operations$2,521,672 $2,201,714 
Total revenues:
United States electrical construction and facilities services$528,720 $474,438 
United States mechanical construction and facilities services1,003,709 896,551 
United States building services656,017 578,274 
United States industrial services232,479 175,488 
Less intersegment revenues(28,733)(33,112)
Total United States operations2,392,192 2,091,639 
United Kingdom building services129,480 110,075 
Total operations$2,521,672 $2,201,714 

 For the nine months ended
September 30,
 20212020
Revenues from unrelated entities:
United States electrical construction and facilities services$1,473,590 $1,344,275 
United States mechanical construction and facilities services2,862,195 2,516,062 
United States building services1,838,750 1,563,107 
United States industrial services702,763 776,554 
Total United States operations6,877,298 6,199,998 
United Kingdom building services386,089 315,569 
Total operations$7,263,387 $6,515,567 
Total revenues:
United States electrical construction and facilities services$1,476,410 $1,348,646 
United States mechanical construction and facilities services2,873,721 2,528,395 
United States building services1,907,264 1,620,310 
United States industrial services730,851 788,426 
Less intersegment revenues(110,948)(85,779)
Total United States operations6,877,298 6,199,998 
United Kingdom building services386,089 315,569 
Total operations$7,263,387 $6,515,567 
NOTE 15 - Segment Information (Continued)
For the three months ended
September 30,
20212020
Operating income (loss):
United States electrical construction and facilities services$44,055 $45,928 
United States mechanical construction and facilities services82,302 80,048 
United States building services31,589 38,449 
United States industrial services(3,012)(8,907)
Total United States operations154,934 155,518 
United Kingdom building services6,582 5,327 
Corporate administration(24,095)(24,454)
Restructuring expenses— (536)
Total operations137,421 135,855 
Other items:
Net periodic pension (cost) income908 751 
Interest expense, net(1,286)(1,484)
Income before income taxes$137,043 $135,122 

For the nine months ended
September 30,
20212020
Operating income (loss):
United States electrical construction and facilities services$127,024 $117,866 
United States mechanical construction and facilities services226,511 192,156 
United States building services91,233 86,325 
United States industrial services(5,663)9,800 
Total United States operations439,105 406,147 
United Kingdom building services23,040 16,442 
Corporate administration(74,362)(70,022)
Restructuring expenses— (605)
Impairment loss on goodwill, identifiable intangible assets, and other long-lived assets— (232,750)
Total operations387,783 119,212 
Other items:
Net periodic pension (cost) income2,738 2,211 
Interest expense, net(3,965)(6,082)
Income before income taxes$386,556 $115,341 
NOTE 15 - Segment Information (Continued)
September 30,
2021		December 31,
2020
Total assets:
United States electrical construction and facilities services$842,143 $672,226 
United States mechanical construction and facilities services1,653,631 1,542,531 
United States building services1,149,330 1,040,160 
United States industrial services607,999 550,513 
Total United States operations4,253,103 3,805,430 
United Kingdom building services246,711 227,894 
Corporate administration796,864 1,030,516 
Total operations$5,296,678 $5,063,840