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Segment Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Company
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Segment Reporting Information [Line Items]          
Number of operating subsidiaries | Company     100    
Revenues from unrelated entities $ 4,304,400 $ 3,666,897 $ 8,171,772 $ 7,099,173  
Total revenues 4,304,400 3,666,897 8,171,772 7,099,173  
Operating income (loss) 415,212 332,808 733,968 592,761  
Net periodic pension income 55 221 109 443  
Interest (expense) income, net (3,240) 6,106 2,147 13,647  
Income before income taxes 412,027 339,135 736,224 606,851  
Cost of sales 3,470,629 2,982,896 6,615,283 5,825,863  
Selling, general and administrative expenses 418,559 351,193 822,521 680,549  
Depreciation and amortization of property, plant, and equipment 16,557 14,071 32,139 27,408  
Amortization of identifiable intangible assets 30,089 20,161 56,452 36,412  
Capital expenditures 28,043 19,251 54,174 39,529  
Total assets 8,400,480   8,400,480   $ 7,716,473
UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 4,169,836 3,560,330 7,931,907 6,887,919  
Total revenues 4,169,836 3,560,330 7,931,907 6,887,919  
Operating income (loss) 446,007 361,602 811,994 655,336  
Cost of sales 3,352,640 2,889,293 6,404,197 5,639,943  
Selling, general and administrative expenses 371,189 309,435 715,716 592,640  
Depreciation and amortization of property, plant, and equipment 15,161 12,855 29,562 25,053  
Amortization of identifiable intangible assets 30,089 20,161 56,452 36,412  
Capital expenditures 24,545 17,166 46,794 34,953  
Total assets 7,473,766   7,473,766   5,976,858
United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,340,247 799,994 2,428,091 1,564,705  
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,755,258 1,655,181 3,327,860 3,082,846  
United States Building Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 793,259 781,108 1,535,882 1,562,268  
United States Industrial Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 281,072 324,047 640,074 678,100  
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 134,564 106,567 239,865 211,254  
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,341,883 801,587 2,431,833 1,566,789  
Total revenues 1,364,158 802,884 2,478,353 1,569,623  
Operating income (loss) 157,644 88,577 293,701 180,166  
Cost of sales 1,080,188 653,166 1,956,431 1,280,035  
Selling, general and administrative expenses 102,415 58,251 177,959 104,504  
Depreciation and amortization of property, plant, and equipment 2,464 1,960 4,769 3,921  
Amortization of identifiable intangible assets 12,950 1,521 22,430 3,333  
Capital expenditures 4,187 2,036 8,809 3,104  
Total assets 2,649,544   2,649,544   1,314,577
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,756,632 1,656,931 3,330,253 3,085,912  
Total revenues 1,779,871 1,669,887 3,364,985 3,106,715  
Operating income (loss) 238,737 213,440 425,484 364,160  
Cost of sales 1,395,519 1,328,642 2,661,229 2,508,047  
Selling, general and administrative expenses 121,002 113,099 241,147 210,639  
Depreciation and amortization of property, plant, and equipment 5,365 3,946 10,241 7,424  
Amortization of identifiable intangible assets 5,978 7,164 11,375 10,992  
Capital expenditures 12,367 8,415 23,346 16,553  
Total assets 2,790,973   2,790,973   2,659,184
Operating Segments [Member] | United States Building Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Total revenues 805,703 792,277 1,557,587 1,596,150  
Operating income (loss) 50,045 46,839 86,468 80,298  
Cost of sales 634,690 633,130 1,236,199 1,277,440  
Selling, general and administrative expenses 108,524 101,139 213,215 204,530  
Depreciation and amortization of property, plant, and equipment 4,042 3,881 8,083 7,808  
Amortization of identifiable intangible assets 5,240 5,652 10,805 10,628  
Capital expenditures 4,770 4,944 8,113 9,992  
Total assets 1,453,210   1,453,210   1,396,236
Operating Segments [Member] | United States Industrial Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Total revenues 287,411 326,312 651,743 684,487  
Operating income (loss) (419) 12,746 6,341 30,712  
Cost of sales 242,243 274,355 550,338 574,421  
Selling, general and administrative expenses 39,248 36,946 83,395 72,967  
Depreciation and amortization of property, plant, and equipment 3,290 3,068 6,469 5,900  
Amortization of identifiable intangible assets 5,921 5,824 11,842 11,459  
Capital expenditures 3,221 1,771 6,526 5,304  
Total assets 580,039   580,039   606,861
Operating Segments [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM          
Segment Reporting Information [Line Items]          
Total revenues 134,564 106,567 239,865 211,254  
Operating income (loss) 8,425 5,777 13,412 11,154  
Cost of sales 117,989 93,603 211,086 185,920  
Selling, general and administrative expenses 8,150 7,187 15,367 14,180  
Depreciation and amortization of property, plant, and equipment 1,068 1,009 2,000 1,902  
Amortization of identifiable intangible assets 0 0 0 0  
Capital expenditures 1,928 1,905 4,384 3,850  
Total assets 333,788   333,788   283,897
Corporate, Non-Segment [Member]          
Segment Reporting Information [Line Items]          
Operating income (loss) (39,220) (34,571) (91,438) (73,729)  
Selling, general and administrative expenses 39,220 34,571 91,438 73,729  
Depreciation and amortization of property, plant, and equipment 328 207 577 453  
Capital expenditures 1,570 180 2,996 726  
Total assets 592,926   592,926   $ 1,455,718
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Total revenues (67,307) (31,030) (120,761) (69,056)  
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities (1,636) (1,593) (3,742) (2,084)  
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities $ (1,374) $ (1,750) $ (2,393) $ (3,066)