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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Schedule of Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Roll Forward]    
Goodwill, Beginning balance $ 956,549 $ 919,151
Acquisitions 61,866 37,398
Goodwill, intersegment transfers   0
Goodwill, Ending balance 1,018,415 956,549
United States Electrical Construction And Facilities Services    
Goodwill [Roll Forward]    
Goodwill, Beginning balance 178,013 178,013
Acquisitions 13,739 0
Goodwill, intersegment transfers   0
Goodwill, Ending balance 191,752 178,013
United States Mechanical Construction And Facilities Services    
Goodwill [Roll Forward]    
Goodwill, Beginning balance 318,353 315,329
Acquisitions 26,111 4,524
Goodwill, intersegment transfers   (1,500)
Goodwill, Ending balance 344,464 318,353
United States Building Services    
Goodwill [Roll Forward]    
Goodwill, Beginning balance 346,095 311,721
Acquisitions 12,210 32,874
Goodwill, intersegment transfers   1,500
Goodwill, Ending balance 358,305 346,095
United States Industrial Services    
Goodwill [Roll Forward]    
Goodwill, Beginning balance 114,088 114,088
Acquisitions 9,806 0
Goodwill, intersegment transfers   0
Goodwill, Ending balance $ 123,894 $ 114,088