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Segment Information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Company
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Segment Reporting Information [Line Items]      
Revenues from unrelated entities $ 12,582,873 $ 11,076,120 $ 9,903,580
Total revenues 12,582,873 11,076,120 9,903,580
Operating income (loss) 875,756 564,877 530,800
Impairment loss on long-lived assets (2,350) 0 0
Net periodic pension (cost) income (1,119) 4,311 3,625
Interest expense (17,199) (13,199) (6,071)
Interest income 15,415 2,761 949
Income before income taxes 872,853 558,750 529,303
Capital expenditures 78,404 49,289 36,192
Depreciation and amortization of property, plant, and equipment 51,822 47,296 48,347
Contract assets 269,885 273,176 230,143
Contract liabilities 1,595,109 1,098,263 788,134
Total assets $ 6,609,721 5,524,607 5,441,446
Number of operating subsidiaries | Company 100    
UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities $ 12,146,450 10,599,042 9,393,629
Total revenues 12,146,450 10,599,042 9,393,629
Operating income (loss) 979,654 645,479 604,833
Capital expenditures 74,748 46,366 32,791
Depreciation and amortization of property, plant, and equipment 47,723 42,887 42,396
Contract assets 249,712 242,656 199,294
Contract liabilities 1,565,599 1,068,181 754,298
Total assets 5,440,862 4,672,469 4,206,824
UNITED STATES | United States Electrical Construction And Facilities Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 2,783,723 2,433,114 2,029,893
UNITED STATES | United States Mechanical Construction And Facilities Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 5,074,803 4,292,208 3,922,200
UNITED STATES | United States Building Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 3,120,134 2,754,953 2,455,129
UNITED STATES | United States Industrial Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 1,167,790 1,118,767 986,407
UNITED KINGDOM | United Kingdom Building Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 436,423 477,078 509,951
Operating Segments [Member] | UNITED STATES | United States Electrical Construction And Facilities Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 2,786,007 2,437,304 2,033,168
Total revenues 2,786,895 2,438,916 2,033,863
Operating income (loss) 230,640 148,728 169,355
Capital expenditures 6,929 11,228 4,985
Depreciation and amortization of property, plant, and equipment 8,402 7,543 7,229
Contract assets 73,464 75,603 48,382
Contract liabilities 399,550 271,161 200,966
Total assets 1,243,707 1,078,405 855,417
Operating Segments [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 5,083,903 4,303,090 3,929,035
Total revenues 5,134,686 4,338,584 3,935,737
Operating income (loss) 530,644 330,325 312,809
Capital expenditures 37,543 11,930 10,108
Depreciation and amortization of property, plant, and equipment 12,503 11,492 11,354
Contract assets 97,252 99,632 89,102
Contract liabilities 925,481 594,453 386,518
Total assets 2,242,833 1,835,001 1,664,822
Operating Segments [Member] | UNITED STATES | United States Building Services      
Segment Reporting Information [Line Items]      
Total revenues 3,228,056 2,856,115 2,553,566
Operating income (loss) 182,995 146,639 124,335
Capital expenditures 19,843 13,303 11,539
Depreciation and amortization of property, plant, and equipment 15,672 12,964 12,090
Contract assets 61,867 56,694 42,818
Contract liabilities 223,202 184,821 150,333
Total assets 1,382,664 1,206,518 1,097,568
Operating Segments [Member] | UNITED STATES | United States Industrial Services      
Segment Reporting Information [Line Items]      
Total revenues 1,179,321 1,175,469 1,021,217
Operating income (loss) 35,375 19,787 (1,666)
Capital expenditures 10,433 9,905 6,159
Depreciation and amortization of property, plant, and equipment 11,146 10,888 11,723
Contract assets 17,129 10,727 18,992
Contract liabilities 17,366 17,746 16,481
Total assets 571,658 552,545 589,017
Operating Segments [Member] | UNITED KINGDOM | United Kingdom Building Services      
Segment Reporting Information [Line Items]      
Total revenues 436,423 477,078 509,951
Operating income (loss) 25,681 29,838 27,998
Capital expenditures 1,984 2,816 3,015
Depreciation and amortization of property, plant, and equipment 3,116 2,752 3,938
Contract assets 20,173 30,520 30,849
Contract liabilities 29,510 30,082 33,836
Total assets 277,066 255,547 241,740
Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Operating income (loss) (127,229) (110,440) (102,031)
Capital expenditures 1,672 107 386
Depreciation and amortization of property, plant, and equipment 983 1,657 2,013
Total assets 891,793 596,591 992,882
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Total revenues (182,508) (210,042) (150,754)
Intersegment Eliminations [Member] | UNITED STATES | United States Electrical Construction And Facilities Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities (2,284) (4,190) (3,275)
Intersegment Eliminations [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities $ (9,100) $ (10,882) $ (6,835)