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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Oct. 01, 2024
Goodwill and Intangible Assets[Line Items]        
Goodwill $ 1,018,415,000 $ 956,549,000 $ 919,151,000  
Goodwill impairment $ 0 0 0  
Goodwill, accumulated impairment loss     493,600,000  
Amortization periods 7 years 9 months      
Amortization of identifiable intangible assets $ 77,002,000 67,143,000 61,315,000  
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 0 2,400,000 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  
2024Acquisitions        
Goodwill and Intangible Assets[Line Items]        
Goodwill 61,900,000      
Identifiable intangible assets acquired 139,100,000      
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       10.60%
United States Electrical Construction And Facilities Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill $ 191,752,000 178,013,000 178,013,000  
Goodwill allocated, percentage 18.80%      
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital       $ 226,500,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate       123,200,000
United States Mechanical Construction And Facilities Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill $ 344,464,000 318,353,000 315,329,000  
Goodwill allocated, percentage 33.80%      
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital       383,700,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate       $ 210,100,000
United States Building Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill $ 358,305,000 346,095,000 311,721,000  
Goodwill allocated, percentage 35.20%      
Weighted average cost of capital used in annual testing, percentage       10.90%
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital       $ 93,500,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate       $ 46,000,000.0
Goodwill, accumulated impairment loss     139,500,000  
United States Industrial Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill $ 123,894,000 $ 114,088,000 114,088,000  
Goodwill allocated, percentage 12.20%      
Weighted average cost of capital used in annual testing, percentage       10.50%
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital       $ 32,500,000
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate       $ 13,000,000.0
Goodwill, accumulated impairment loss     $ 354,100,000  
Customer relationships        
Goodwill and Intangible Assets[Line Items]        
Amortization periods 8 years 3 months      
Developed technology/Vendor network        
Goodwill and Intangible Assets[Line Items]        
Amortization periods 2 years 9 months      
Trade names (finite-lived)        
Goodwill and Intangible Assets[Line Items]        
Amortization periods 4 years 6 months      
Contract backlog        
Goodwill and Intangible Assets[Line Items]        
Amortization periods 9 months