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Segment Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Company
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Segment Reporting Information [Line Items]          
Number of operating subsidiaries | Company     100    
Revenues from unrelated entities $ 3,696,924 $ 3,207,598 $ 10,796,097 $ 9,143,652  
Total revenues 3,696,924 3,207,598 10,796,097 9,143,652  
Operating income (loss) 363,538 234,983 956,299 586,560  
Net periodic pension income (cost) 227 (284) 670 (840)  
Interest income (expense), net 8,312 (90) 21,959 (4,614)  
Income before income taxes 372,077 234,609 978,928 581,106  
Total assets 7,321,952   7,321,952   $ 6,609,721
Impairment loss on long-lived assets 0 (2,350) 0 (2,350)  
UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 3,590,574 3,096,872 10,478,493 8,816,009  
Total revenues 3,590,574 3,096,872 10,478,493 8,816,009  
Operating income (loss) 392,803 258,585 1,048,139 662,591  
Total assets 5,921,369   5,921,369   5,440,862
United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 845,030 697,406 2,409,735 2,020,319  
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,662,211 1,329,600 4,745,057 3,602,271  
United States Building Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 796,923 817,718 2,359,191 2,318,105  
United States Industrial Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 286,410 252,148 964,510 875,314  
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 106,350 110,726 317,604 327,643  
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 846,064 697,766 2,412,853 2,022,002  
Total revenues 850,587 697,897 2,420,210 2,022,557  
Operating income (loss) 119,118 63,127 299,284 154,365  
Total assets 1,240,898   1,240,898   1,243,707
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,663,818 1,332,747 4,749,730 3,608,595  
Total revenues 1,676,341 1,342,149 4,783,056 3,650,875  
Operating income (loss) 214,831 138,476 578,991 344,550  
Total assets 2,644,195   2,644,195   2,242,833
Operating Segments [Member] | United States Building Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Total revenues 806,448 846,400 2,402,598 2,397,944  
Operating income (loss) 55,562 57,156 135,860 140,943  
Total assets 1,422,089   1,422,089   1,382,664
Operating Segments [Member] | United States Industrial Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Total revenues 286,611 252,244 971,098 883,808  
Operating income (loss) 3,292 (174) 34,004 22,733  
Total assets 614,187   614,187   571,658
Operating Segments [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM          
Segment Reporting Information [Line Items]          
Total revenues 106,350 110,726 317,604 327,643  
Operating income (loss) 5,497 8,869 16,651 20,220  
Total assets 297,440   297,440   277,066
Corporate, Non-Segment [Member]          
Segment Reporting Information [Line Items]          
Operating income (loss) (34,762) (30,121) (108,491) (93,901)  
Total assets 1,103,143   1,103,143   $ 891,793
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Total revenues (29,413) (41,818) (98,469) (139,175)  
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities (1,034) (360) (3,118) (1,683)  
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities $ (1,607) $ (3,147) $ (4,673) $ (6,324)