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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Schedule of Goodwill (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Goodwill [Roll Forward]      
Goodwill, Beginning balance $ 890,268,000 $ 851,783,000  
Acquisitions and purchase price adjustments 28,883,000 38,485,000  
Goodwill impairment 0 0  
Goodwill, intersegment transfers 0 0  
Goodwill, Ending balance 919,151,000 890,268,000 $ 851,783,000
United States Electrical Construction And Facilities Services      
Goodwill [Roll Forward]      
Goodwill, Beginning balance 159,512,000 142,545,000  
Acquisitions and purchase price adjustments 17,601,000 24,467,000  
Goodwill, intersegment transfers 900,000 (7,500,000)  
Goodwill, Ending balance 178,013,000 159,512,000 142,545,000
United States Mechanical Construction And Facilities Services      
Goodwill [Roll Forward]      
Goodwill, Beginning balance 303,887,000 299,618,000  
Acquisitions and purchase price adjustments 6,942,000 4,269,000  
Goodwill, intersegment transfers 4,500,000 0  
Goodwill, Ending balance 315,329,000 303,887,000 299,618,000
United States Building Services      
Goodwill [Roll Forward]      
Goodwill, Beginning balance 312,781,000 302,132,000  
Acquisitions and purchase price adjustments 4,340,000 9,749,000  
Goodwill, intersegment transfers (5,400,000) 900,000  
Goodwill, Ending balance 311,721,000 312,781,000 302,132,000
United States Industrial Services      
Goodwill [Roll Forward]      
Goodwill, Beginning balance 114,088,000 107,488,000  
Acquisitions and purchase price adjustments 0 0  
Goodwill impairment     (225,500,000)
Goodwill, intersegment transfers 0 6,600,000  
Goodwill, Ending balance $ 114,088,000 $ 114,088,000 $ 107,488,000