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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Schedule of Goodwill (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Goodwill [Roll Forward]      
Goodwill, Beginning balance $ 919,151,000 $ 890,268,000  
Acquisitions 37,398,000 28,883,000  
Goodwill impairment 0 0 $ 0
Goodwill, intersegment transfers 0 0  
Goodwill, Ending balance 956,549,000 919,151,000 890,268,000
United States Electrical Construction And Facilities Services      
Goodwill [Roll Forward]      
Goodwill, Beginning balance 178,013,000 159,512,000  
Acquisitions 0 17,601,000  
Goodwill, intersegment transfers 0 900,000  
Goodwill, Ending balance 178,013,000 178,013,000 159,512,000
United States Mechanical Construction And Facilities Services      
Goodwill [Roll Forward]      
Goodwill, Beginning balance 315,329,000 303,887,000  
Acquisitions 4,524,000 6,942,000  
Goodwill, intersegment transfers (1,500,000) 4,500,000  
Goodwill, Ending balance 318,353,000 315,329,000 303,887,000
United States Building Services      
Goodwill [Roll Forward]      
Goodwill, Beginning balance 311,721,000 312,781,000  
Acquisitions 32,874,000 4,340,000  
Goodwill, intersegment transfers 1,500,000 (5,400,000)  
Goodwill, Ending balance 346,095,000 311,721,000 312,781,000
United States Industrial Services      
Goodwill [Roll Forward]      
Goodwill, Beginning balance 114,088,000 114,088,000  
Acquisitions 0 0  
Goodwill, intersegment transfers 0 0  
Goodwill, Ending balance $ 114,088,000 $ 114,088,000 $ 114,088,000