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Segment Information (Tables)
12 Months Ended
Dec. 31, 2022
Segment Reporting [Abstract]  
Information About Reportable Segments
The following tables present financial information for each of our reportable segments for the years ended December 31, 2022, 2021, and 2020 (in thousands): 
 202220212020
Revenues from unrelated entities:
United States electrical construction and facilities services$2,433,114 $2,029,893 $1,829,979 
United States mechanical construction and facilities services4,326,674 3,952,586 3,516,789 
United States building services2,720,487 2,424,743 2,078,835 
United States industrial services1,118,767 986,407 940,895 
Total United States operations10,599,042 9,393,629 8,366,498 
United Kingdom building services477,078 509,951 430,563 
Total operations$11,076,120 $9,903,580 $8,797,061 
202220212020
Total revenues:
United States electrical construction and facilities services$2,438,916 $2,033,863 $1,836,370 
United States mechanical construction and facilities services4,373,050 3,966,123 3,529,880 
United States building services2,821,649 2,523,180 2,161,487 
United States industrial services1,175,469 1,021,217 956,373 
Less intersegment revenues(210,042)(150,754)(117,612)
Total United States operations10,599,042 9,393,629 8,366,498 
United Kingdom building services477,078 509,951 430,563 
Total operations$11,076,120 $9,903,580 $8,797,061 

202220212020
Operating income (loss):
United States electrical construction and facilities services$148,728 $169,355 $162,538 
United States mechanical construction and facilities services332,294 314,420 290,444 
United States building services144,670 122,724 115,523 
United States industrial services19,787 (1,666)1,175 
Total United States operations645,479 604,833 569,680 
United Kingdom building services29,838 27,998 20,660 
Corporate administration(110,440)(102,031)(98,542)
Restructuring expenses— — (2,214)
Impairment loss on goodwill, identifiable intangible assets,
and other long-lived assets
— — (232,750)
Total operations564,877 530,800 256,834 
Other items:
Net periodic pension (cost) income4,311 3,625 2,980 
Interest expense(13,199)(6,071)(9,009)
Interest income2,761 949 1,521 
Income before income taxes$558,750 $529,303 $252,326 
NOTE 18 - SEGMENT INFORMATION (Continued)
202220212020
Capital expenditures:   
United States electrical construction and facilities services$11,228 $4,985 $8,679 
United States mechanical construction and facilities services12,004 10,182 11,347 
United States building services13,229 11,465 10,259 
United States industrial services9,905 6,159 9,595 
Total United States operations46,366 32,791 39,880 
United Kingdom building services2,816 3,015 3,693 
Corporate administration107 386 4,396 
Total operations$49,289 $36,192 $47,969 
202220212020
Depreciation and amortization of property, plant and equipment:   
United States electrical construction and facilities services$7,543 $7,229 $6,734 
United States mechanical construction and facilities services11,556 11,403 10,964 
United States building services12,900 12,041 12,003 
United States industrial services10,888 11,723 12,405 
Total United States operations42,887 42,396 42,106 
United Kingdom building services2,752 3,938 3,046 
Corporate administration1,657 2,013 1,569 
Total operations$47,296 $48,347 $46,721 

December 31, 2022December 31, 2021December 31, 2020
Contract assets:  
United States electrical construction and facilities services$75,603 $48,382 $30,986 
United States mechanical construction and facilities services100,109 89,538 67,443 
United States building services56,217 42,382 31,661 
United States industrial services10,727 18,992 11,311 
Total United States operations242,656 199,294 141,401 
United Kingdom building services30,520 30,849 30,555 
Total operations$273,176 $230,143 $171,956 
December 31, 2022December 31, 2021December 31, 2020
Contract liabilities:  
United States electrical construction and facilities services$271,161 $200,966 $183,499 
United States mechanical construction and facilities services597,001 388,039 373,957 
United States building services182,273 148,812 117,643 
United States industrial services17,746 16,481 17,304 
Total United States operations1,068,181 754,298 692,403 
United Kingdom building services30,082 33,836 29,849 
Total operations$1,098,263 $788,134 $722,252 
   
NOTE 18 - SEGMENT INFORMATION (Continued)
December 31, 2022December 31, 2021December 31, 2020
Long-lived assets:
United States electrical construction and facilities services$302,448 $237,766 $177,692 
United States mechanical construction and facilities services519,335 515,741 522,800 
United States building services496,206 498,692 481,733 
United States industrial services341,646 365,563 394,505 
Total United States operations1,659,635 1,617,762 1,576,730 
United Kingdom building services10,320 11,402 12,017 
Corporate administration990 2,535 4,356 
Total operations$1,670,945 $1,631,699 $1,593,103 
December 31, 2022December 31, 2021December 31, 2020
Total assets:
United States electrical construction and facilities services$1,078,405 $855,417 $680,060 
United States mechanical construction and facilities services1,845,518 1,672,546 1,552,567 
United States building services1,196,001 1,089,844 1,022,290 
United States industrial services552,545 589,017 550,513 
Total United States operations4,672,469 4,206,824 3,805,430 
United Kingdom building services255,547 241,740 227,894 
Corporate administration596,591 992,882 1,030,516 
Total operations$5,524,607 $5,441,446 $5,063,840