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Segment Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Company
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Segment Reporting Information [Line Items]          
Number of operating subsidiaries | Company     100    
Revenues from unrelated entities $ 3,666,897 $ 3,045,622 $ 7,099,173 $ 5,936,054  
Total revenues 3,666,897 3,045,622 7,099,173 5,936,054  
Operating income (loss) 332,808 196,667 592,761 351,577  
Net periodic pension income (cost) 221 (282) 443 (556)  
Interest income (expense), net 6,106 (2,692) 13,647 (4,524)  
Income before income taxes 339,135 193,693 606,851 346,497  
Total assets 7,072,549   7,072,549   $ 6,609,721
UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 3,560,330 2,939,575 6,887,919 5,719,137  
Total revenues 3,560,330 2,939,575 6,887,919 5,719,137  
Operating income (loss) 361,602 224,593 655,336 404,006  
Total assets 5,904,655   5,904,655   5,440,862
United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 799,994 678,167 1,564,705 1,322,913  
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,655,181 1,194,113 3,082,846 2,272,671  
United States Building Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 781,108 775,012 1,562,268 1,500,387  
United States Industrial Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 324,047 292,283 678,100 623,166  
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 106,567 106,047 211,254 216,917  
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 801,587 678,709 1,566,789 1,324,236  
Total revenues 802,884 679,006 1,569,623 1,324,660  
Operating income (loss) 88,577 50,722 180,166 91,238  
Total assets 1,242,145   1,242,145   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 1,656,931 1,195,812 3,085,912 2,275,848  
Total revenues 1,669,887 1,209,242 3,106,715 2,308,726  
Operating income (loss) 213,440 119,847 364,160 206,074  
Total assets 2,599,846   2,599,846   2,242,833
Operating Segments [Member] | United States Building Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Total revenues 792,277 802,934 1,596,150 1,551,544  
Operating income (loss) 46,839 46,137 80,298 83,787  
Total assets 1,424,862   1,424,862   1,382,664
Operating Segments [Member] | United States Industrial Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Total revenues 326,312 293,057 684,487 631,564  
Operating income (loss) 12,746 7,887 30,712 22,907  
Total assets 637,802   637,802   571,658
Operating Segments [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM          
Segment Reporting Information [Line Items]          
Total revenues 106,567 106,047 211,254 216,917  
Operating income (loss) 5,777 5,927 11,154 11,351  
Total assets 275,714   275,714   277,066
Corporate, Non-Segment [Member]          
Segment Reporting Information [Line Items]          
Operating income (loss) (34,571) (33,853) (73,729) (63,780)  
Total assets 892,180   892,180   $ 891,793
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Total revenues (31,030) (44,664) (69,056) (97,357)  
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities (1,593) (542) (2,084) (1,323)  
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities $ (1,750) $ (1,699) $ (3,066) $ (3,177)