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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Schedule of Goodwill (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Roll Forward]      
Goodwill, Beginning balance $ 1,063,911,000 $ 990,887,000  
Acquisitions and purchase price adjustments 13,372,000 73,024,000  
Goodwill, intersegment transfers   0  
Goodwill impairment (225,500,000) 0 $ 0
Goodwill, Ending balance 851,783,000 1,063,911,000 990,887,000
United States electrical construction and facilities services segment      
Goodwill [Roll Forward]      
Goodwill, Beginning balance 142,545,000 133,207,000  
Acquisitions and purchase price adjustments 0 9,338,000  
Goodwill, intersegment transfers   0  
Goodwill impairment 0    
Goodwill, Ending balance 142,545,000 142,545,000 133,207,000
United States Mechanical Construction And Facilities Services      
Goodwill [Roll Forward]      
Goodwill, Beginning balance 299,220,000 256,321,000  
Acquisitions and purchase price adjustments 398,000 48,699,000  
Goodwill, intersegment transfers   (5,800,000)  
Goodwill impairment 0    
Goodwill, Ending balance 299,618,000 299,220,000 256,321,000
United States Building Services      
Goodwill [Roll Forward]      
Goodwill, Beginning balance 289,158,000 274,171,000  
Acquisitions and purchase price adjustments 12,974,000 14,987,000  
Goodwill, intersegment transfers   0  
Goodwill impairment 0    
Goodwill, Ending balance 302,132,000 289,158,000 274,171,000
United States Industrial Services      
Goodwill [Roll Forward]      
Goodwill, Beginning balance 332,988,000 327,188,000  
Acquisitions and purchase price adjustments 0 0  
Goodwill, intersegment transfers   5,800,000  
Goodwill impairment (225,500,000)    
Goodwill, Ending balance $ 107,488,000 $ 332,988,000 $ 327,188,000