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Segment Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Company
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Segment Reporting Information [Line Items]          
Number of operating subsidiaries | Company     100    
Revenues from unrelated entities $ 4,301,529 $ 3,696,924 $ 12,473,301 $ 10,796,097  
Total revenues 4,301,529 3,696,924 12,473,301 10,796,097  
Operating income (loss) 405,696 363,538 1,139,664 956,299  
Net periodic pension income 56 227 165 670  
Interest income, net 1,838 8,312 3,985 21,959  
Income before income taxes 407,590 372,077 1,143,814 978,928  
Cost of sales 3,466,216 2,962,198 10,081,499 8,788,061  
Selling, general and administrative expenses 429,617 371,188 1,252,138 1,051,737  
Depreciation and amortization of property, plant, and equipment 17,287 14,391 49,426 41,799  
Amortization of identifiable intangible assets 30,515 20,147 86,967 56,559  
Capital expenditures 26,657 17,715 80,831 57,244  
Total assets 8,640,270   8,640,270   $ 7,716,473
UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 4,165,341 3,590,574 12,097,248 10,478,493  
Total revenues 4,165,341 3,590,574 12,097,248 10,478,493  
Operating income (loss) 440,178 392,803 1,252,172 1,048,139  
Cost of sales 3,345,362 2,867,641 9,749,559 8,507,584  
Selling, general and administrative expenses 379,801 330,130 1,095,517 922,770  
Depreciation and amortization of property, plant, and equipment 15,799 13,260 45,361 38,313  
Amortization of identifiable intangible assets 30,515 20,147 86,967 56,559  
Capital expenditures 23,980 16,682 70,774 51,635  
Total assets 7,534,219   7,534,219   5,976,858
United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,285,269 845,030 3,713,360 2,409,735  
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,779,279 1,662,211 5,107,139 4,745,057  
United States Building Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 813,879 796,923 2,349,761 2,359,191  
United States Industrial Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 286,914 286,410 926,988 964,510  
United Kingdom Building Services [Member] | UNITED KINGDOM          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 136,188 106,350 376,053 317,604  
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,286,250 846,064 3,718,083 2,412,853  
Total revenues 1,290,797 850,587 3,769,150 2,420,210  
Operating income (loss) 145,200 119,118 438,901 299,284  
Cost of sales 1,032,602 663,053 2,989,033 1,943,088  
Selling, general and administrative expenses 107,467 62,859 285,426 167,363  
Depreciation and amortization of property, plant, and equipment 2,564 1,954 7,333 5,875  
Amortization of identifiable intangible assets 12,951 1,521 35,381 4,854  
Capital expenditures 6,102 4,495 14,911 7,599  
Total assets 2,604,550   2,604,550   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 1,787,568 1,663,818 5,117,821 4,749,730  
Total revenues 1,794,666 1,676,341 5,159,651 4,783,056  
Operating income (loss) 229,296 214,831 654,780 578,991  
Cost of sales 1,418,153 1,324,978 4,079,382 3,833,025  
Selling, general and administrative expenses 131,830 122,402 372,977 333,041  
Depreciation and amortization of property, plant, and equipment 5,796 4,192 16,037 11,616  
Amortization of identifiable intangible assets 6,321 7,164 17,696 18,156  
Capital expenditures 10,839 6,750 34,185 23,303  
Total assets 2,879,369   2,879,369   2,659,184
Operating Segments [Member] | United States Building Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Total revenues 827,715 806,448 2,385,302 2,402,598  
Operating income (loss) 59,390 55,562 145,858 135,860  
Cost of sales 645,903 632,824 1,882,102 1,910,264  
Selling, general and administrative expenses 108,586 108,537 321,801 313,067  
Depreciation and amortization of property, plant, and equipment 4,095 3,967 12,178 11,775  
Amortization of identifiable intangible assets 5,323 5,539 16,128 16,167  
Capital expenditures 3,373 3,579 11,486 13,571  
Total assets 1,474,531   1,474,531   1,396,236
Operating Segments [Member] | United States Industrial Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Total revenues 288,334 286,611 940,077 971,098  
Operating income (loss) 6,292 3,292 12,633 34,004  
Cost of sales 248,704 246,786 799,042 821,207  
Selling, general and administrative expenses 31,918 36,332 115,313 109,299  
Depreciation and amortization of property, plant, and equipment 3,344 3,147 9,813 9,047  
Amortization of identifiable intangible assets 5,920 5,923 17,762 17,382  
Capital expenditures 3,666 1,858 10,192 7,162  
Total assets 575,769   575,769   606,861
Operating Segments [Member] | United Kingdom Building Services [Member] | UNITED KINGDOM          
Segment Reporting Information [Line Items]          
Total revenues 136,188 106,350 376,053 317,604  
Operating income (loss) 7,563 5,497 20,975 16,651  
Cost of sales 120,854 94,557 331,940 280,477  
Selling, general and administrative expenses 7,771 6,296 23,138 20,476  
Depreciation and amortization of property, plant, and equipment 1,118 909 3,118 2,811  
Amortization of identifiable intangible assets 0 0 0 0  
Capital expenditures 1,140 754 5,524 4,604  
Total assets 332,719   332,719   283,897
Corporate, Non-Segment [Member]          
Segment Reporting Information [Line Items]          
Operating income (loss) (42,045) (34,762) (133,483) (108,491)  
Selling, general and administrative expenses 42,045 34,762 133,483 108,491  
Depreciation and amortization of property, plant, and equipment 370 222 947 675  
Capital expenditures 1,537 279 4,533 1,005  
Total assets 773,332   773,332   $ 1,455,718
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Total revenues (36,171) (29,413) (156,932) (98,469)  
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities (981) (1,034) (4,723) (3,118)  
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities $ (8,289) $ (1,607) $ (10,682) $ (4,673)