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Goodwill and Identifiable Intangible Assets - Narrative (Details) - USD ($)
 12 Months Ended
Oct. 01, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets[Line Items]        
Goodwill   $ 1,063,911,000 $ 990,887,000 $ 964,893,000
Goodwill acquired   72,700,000 26,300,000  
Non-cash goodwill impairment charge   0 0 57,500,000
Non-cash expense for impairment of identifiable intangible assets   0 907,000 57,819,000
Non-cash impairment charge of finite-lived intangible assets   0 900,000 0
Goodwill, accumulated impairment loss       268,100,000
Indefinite-lived intangible asset acquired   $ 171,300,000 36,600,000  
Amortization periods   8 years 6 months    
Amortization of identifiable intangible assets   $ 48,142,000 42,443,000 48,594,000
Domestic Segments        
Goodwill and Intangible Assets[Line Items]        
Perpetual growth rate used for annual testing 2.70%      
Domestic Construction        
Goodwill and Intangible Assets[Line Items]        
Weighted average cost of capital used in annual testing for impairment 9.50%      
United States Electrical Construction And Facilities Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill   $ 142,545,000 133,207,000 125,707,000
Goodwill allocated   13.40%    
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital   $ 108,800,000    
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate   61,400,000    
United States Mechanical Construction And Facilities Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill   $ 299,220,000 256,321,000 256,265,000
Goodwill allocated   28.10%    
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital   $ 156,700,000    
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate   90,500,000    
United States Building Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill   $ 289,158,000 274,171,000 255,733,000
Goodwill allocated   27.20%    
Weighted average cost of capital used in annual testing for impairment 9.10%      
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital   $ 98,000,000.0    
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate   55,700,000    
Goodwill, accumulated impairment loss       139,500,000
United States Industrial Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill   $ 332,988,000 327,188,000 327,188,000
Goodwill allocated   31.30%    
Weighted average cost of capital used in annual testing for impairment 10.50%      
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital   $ 40,300,000    
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate   $ 20,500,000    
Goodwill, accumulated impairment loss       128,600,000
Contract backlog        
Goodwill and Intangible Assets[Line Items]        
Amortization periods   9 months    
Developed technology/Vendor network        
Goodwill and Intangible Assets[Line Items]        
Amortization periods   7 years 6 months    
Customer relationships        
Goodwill and Intangible Assets[Line Items]        
Amortization periods   8 years 9 months    
Trade names (amortized)        
Goodwill and Intangible Assets[Line Items]        
Amortization periods   10 years 9 months    
Trade names (unamortized)        
Goodwill and Intangible Assets[Line Items]        
Non-cash expense for impairment of identifiable intangible assets   $ 0 $ 0 $ 300,000