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Segment Information
 12 Months Ended
Dec. 31, 2021
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. 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.
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 18 - SEGMENT INFORMATION (Continued)
The following tables present financial information for each of our reportable segments for the years ended December 31, 2021, 2020, and 2019 (in thousands): 
 202120202019
Revenues from unrelated entities:
United States electrical construction and facilities services$2,015,466 $1,806,092 $1,961,798 
United States mechanical construction and facilities services3,922,864 3,485,495 3,340,337 
United States building services2,468,892 2,134,016 2,121,661 
United States industrial services986,407 940,895 1,327,556 
Total United States operations9,393,629 8,366,498 8,751,352 
United Kingdom building services509,951 430,563 423,259 
Total operations$9,903,580 $8,797,061 $9,174,611 
202120202019
Total revenues:
United States electrical construction and facilities services$2,019,400 $1,812,445 $1,965,483 
United States mechanical construction and facilities services3,939,753 3,502,131 3,370,960 
United States building services2,564,013 2,213,161 2,197,305 
United States industrial services1,021,217 956,373 1,351,448 
Less intersegment revenues(150,754)(117,612)(133,844)
Total United States operations9,393,629 8,366,498 8,751,352 
United Kingdom building services509,951 430,563 423,259 
Total operations$9,903,580 $8,797,061 $9,174,611 

202120202019
Operating income (loss):
United States electrical construction and facilities services$168,363 $161,810 $147,817 
United States mechanical construction and facilities services319,112 292,536 225,040 
United States building services119,024 114,159 115,432 
United States industrial services(1,666)1,175 57,529 
Total United States operations604,833 569,680 545,818 
United Kingdom building services27,998 20,660 18,323 
Corporate administration(102,031)(98,542)(101,726)
Restructuring expenses— (2,214)(1,523)
Impairment loss on goodwill, identifiable intangible assets,
and other long-lived assets		— (232,750)— 
Total operations530,800 256,834 460,892 
Other items:
Net periodic pension (cost) income3,625 2,980 1,553 
Interest expense(6,071)(9,009)(13,821)
Interest income949 1,521 2,265 
Income before income taxes$529,303 $252,326 $450,889 
NOTE 18 - SEGMENT INFORMATION (Continued)
202120202019
Capital expenditures:   
United States electrical construction and facilities services$4,976 $8,674 $4,839 
United States mechanical construction and facilities services10,420 11,239 7,890 
United States building services11,236 10,372 14,370 
United States industrial services6,159 9,595 16,760 
Total United States operations32,791 39,880 43,859 
United Kingdom building services3,015 3,693 3,598 
Corporate administration386 4,396 975 
Total operations$36,192 $47,969 $48,432 
202120202019
Depreciation and amortization of property, plant and equipment:   
United States electrical construction and facilities services$7,189 $6,693 $6,664 
United States mechanical construction and facilities services11,130 10,683 8,764 
United States building services12,354 12,325 12,752 
United States industrial services11,723 12,405 12,016 
Total United States operations42,396 42,106 40,196 
United Kingdom building services3,938 3,046 2,942 
Corporate administration2,013 1,569 807 
Total operations$48,347 $46,721 $43,945 

December 31, 2021December 31, 2020December 31, 2019
Contract assets:  
United States electrical construction and facilities services$48,161 $30,728 $47,522 
United States mechanical construction and facilities services87,516 68,058 61,225 
United States building services44,625 31,304 30,557 
United States industrial services18,992 11,311 12,982 
Total United States operations199,294 141,401 152,286 
United Kingdom building services30,849 30,555 25,544 
Total operations$230,143 $171,956 $177,830 
December 31, 2021December 31, 2020December 31, 2019
Contract liabilities:  
United States electrical construction and facilities services$198,247 $182,228 $166,448 
United States mechanical construction and facilities services406,509 386,180 317,083 
United States building services133,061 106,691 101,963 
United States industrial services16,481 17,304 15,548 
Total United States operations754,298 692,403 601,042 
United Kingdom building services33,836 29,849 22,600 
Total operations$788,134 $722,252 $623,642 
   
NOTE 18 - SEGMENT INFORMATION (Continued)
December 31, 2021December 31, 2020December 31, 2019
Long-lived assets:
United States electrical construction and facilities services$236,813 $176,708 $175,038 
United States mechanical construction and facilities services506,290 512,243 530,561 
United States building services509,096 493,274 459,934 
United States industrial services365,563 394,505 654,956 
Total United States operations1,617,762 1,576,730 1,820,489 
United Kingdom building services11,402 12,017 9,622 
Corporate administration2,535 4,356 1,431 
Total operations$1,631,699 $1,593,103 $1,831,542 
December 31, 2021December 31, 2020December 31, 2019
Total assets:
United States electrical construction and facilities services$848,306 $672,226 $736,688 
United States mechanical construction and facilities services1,668,419 1,542,531 1,536,325 
United States building services1,101,082 1,040,160 1,008,263 
United States industrial services589,017 550,513 916,308 
Total United States operations4,206,824 3,805,430 4,197,584 
United Kingdom building services241,740 227,894 181,147 
Corporate administration992,882 1,030,516 451,627 
Total operations$5,441,446 $5,063,840 $4,830,358