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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Oct. 01, 2023
Goodwill and Intangible Assets[Line Items]        
Goodwill $ 956,549,000 $ 919,151,000 $ 890,268,000  
Goodwill impairment $ 0 0 0  
Goodwill, accumulated impairment loss     493,600,000  
Amortization periods 7 years      
Amortization of identifiable intangible assets $ 67,143,000 61,315,000 64,089,000  
Indefinite-Lived Intangible Assets        
Goodwill and Intangible Assets[Line Items]        
Other asset impairment charges, excluding goodwill 0 0 0  
Finite-Lived Intangible Assets        
Goodwill and Intangible Assets[Line Items]        
Other asset impairment charges, excluding goodwill 0 0 0  
Long-Lived Assets        
Goodwill and Intangible Assets[Line Items]        
Other asset impairment charges, excluding goodwill 2,400,000 0 0  
2023 Acquisitions        
Goodwill and Intangible Assets[Line Items]        
Goodwill 37,400,000      
Identifiable intangible assets acquired 59,200,000      
2022 Acquisitions        
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       10.90%
United States Electrical Construction And Facilities Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill $ 178,013,000 178,013,000 159,512,000  
Goodwill allocated, percentage 18.60%      
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital       $ 115,200,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate       56,500,000
United States Mechanical Construction And Facilities Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill $ 318,353,000 315,329,000 303,887,000  
Goodwill allocated, percentage 33.30%      
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital       249,900,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate       $ 137,100,000
United States Building Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill $ 346,095,000 311,721,000 312,781,000  
Goodwill allocated, percentage 36.20%      
Weighted average cost of capital used in annual testing, percentage       11.20%
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital       $ 84,200,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate       $ 40,400,000
Goodwill, accumulated impairment loss     139,500,000  
United States Industrial Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill $ 114,088,000 $ 114,088,000 114,088,000  
Goodwill allocated, percentage 11.90%      
Weighted average cost of capital used in annual testing, percentage       11.00%
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital       $ 25,200,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate       $ 9,300,000
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 3 years 9 months      
Trade names (finite-lived)        
Goodwill and Intangible Assets[Line Items]        
Amortization periods 5 years 9 months