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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Oct. 01, 2022
Goodwill and Intangible Assets[Line Items]        
Goodwill $ 919,151,000 $ 890,268,000 $ 851,783,000  
Goodwill impairment 0 0    
Goodwill, accumulated impairment loss     493,600,000  
Other asset impairment charges, excluding goodwill $ 0 0 7,300,000  
Amortization periods 7 years      
Amortization of identifiable intangible assets $ 61,315,000 64,089,000 59,950,000  
2022Acquisitions        
Goodwill and Intangible Assets[Line Items]        
Goodwill 28,900,000      
Identifiable intangible assets acquired 65,900,000      
2021 Acquisitions        
Goodwill and Intangible Assets[Line Items]        
Goodwill   38,300,000    
Identifiable intangible assets acquired   70,600,000    
Domestic Segments        
Goodwill and Intangible Assets[Line Items]        
Perpetual growth rate used for annual testing, percentage       2.50%
Domestic Construction        
Goodwill and Intangible Assets[Line Items]        
Weighted average cost of capital used in annual testing, percentage       10.30%
United States Electrical Construction And Facilities Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill $ 178,013,000 159,512,000 142,545,000  
Goodwill allocated, percentage 19.40%      
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital       $ 90,900,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate       45,000,000
United States Mechanical Construction And Facilities Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill $ 315,329,000 303,887,000 299,618,000  
Goodwill allocated, percentage 34.30%      
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital       172,100,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate       $ 94,200,000
United States Building Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill $ 311,721,000 312,781,000 302,132,000  
Goodwill allocated, percentage 33.90%      
Weighted average cost of capital used in annual testing, percentage       10.20%
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital       $ 92,800,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate       $ 48,100,000
Goodwill, accumulated impairment loss     139,500,000  
United States Industrial Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill $ 114,088,000 $ 114,088,000 107,488,000  
Goodwill allocated, percentage 12.40%      
Weighted average cost of capital used in annual testing, percentage       11.20%
Goodwill impairment     225,500,000  
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital       $ 24,100,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate       $ 9,200,000
Goodwill, accumulated impairment loss     $ 354,100,000  
Customer relationships        
Goodwill and Intangible Assets[Line Items]        
Amortization periods 7 years 3 months      
Developed technology/Vendor network        
Goodwill and Intangible Assets[Line Items]        
Amortization periods 4 years 9 months      
Trade names (finite-lived)        
Goodwill and Intangible Assets[Line Items]        
Amortization periods 7 years      
Contract backlog        
Goodwill and Intangible Assets[Line Items]        
Amortization periods 1 year