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Goodwill and Identifiable Intangible Assets - Narrative (Details) - USD ($)
 12 Months Ended
Oct. 01, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets[Line Items]        
Goodwill   $ 964,893,000 $ 979,628,000 $ 843,170,000
Goodwill acquired   40,600,000 138,000,000  
Non-cash goodwill impairment charge   57,451,000 0 0
Non-cash expense for impairment of identifiable intangible assets   57,819,000 2,428,000 0
Non-cash impairment charge of finite-lived intangible assets   0 0 0
Accumulated impairment charge       210,600,000
Indefinite-lived intangible asset acquired   $ 56,600,000 57,900,000  
Amortization periods   9 years 6 months    
Amortization of identifiable intangible assets   $ 48,594,000 40,908,000 37,895,000
Domestic Segments        
Goodwill and Intangible Assets[Line Items]        
Perpetual growth rate used for annual testing 2.70%      
United States Industrial Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill   $ 327,188,000 384,639,000 384,639,000
Goodwill allocated   33.90%    
Weighted average cost of capital used in annual testing for impairment 11.00%      
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital   $ 20,000,000    
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate   10,000,000    
Non-cash goodwill impairment charge   57,451,000    
Accumulated impairment charge       71,100,000
United States Building Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill   $ 255,733,000 244,793,000 228,637,000
Goodwill allocated   26.50%    
Weighted average cost of capital used in annual testing for impairment 10.00%      
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital   $ 53,300,000    
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate   28,100,000    
Non-cash goodwill impairment charge   0    
Accumulated impairment charge       139,500,000
Domestic Construction        
Goodwill and Intangible Assets[Line Items]        
Weighted average cost of capital used in annual testing for impairment 10.60%      
United States Mechanical Construction And Facilities Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill   $ 256,265,000 226,596,000 226,071,000
Goodwill allocated   26.60%    
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital   $ 74,900,000    
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate   41,000,000    
Non-cash goodwill impairment charge   0    
United States Electrical Construction And Facilities Services        
Goodwill and Intangible Assets[Line Items]        
Goodwill   $ 125,707,000 123,600,000 3,823,000
Goodwill allocated   13.00%    
Effect of 50 Basis Point Increase in the Weighted Average Costs of Capital   $ 51,100,000    
Effect of 50 Basis Point Decrease in the Perpetual Growth Rate   25,100,000    
Non-cash goodwill impairment charge   $ 0    
Contract backlog        
Goodwill and Intangible Assets[Line Items]        
Amortization periods   3 months    
Developed technology/Vendor network        
Goodwill and Intangible Assets[Line Items]        
Amortization periods   9 years 6 months    
Customer relationships        
Goodwill and Intangible Assets[Line Items]        
Amortization periods   9 years 6 months    
Non-competition agreements        
Goodwill and Intangible Assets[Line Items]        
Amortization periods   6 months    
Trade names (amortized)        
Goodwill and Intangible Assets[Line Items]        
Amortization periods   11 years    
Trade names (unamortized)        
Goodwill and Intangible Assets[Line Items]        
Non-cash expense for impairment of identifiable intangible assets   $ 300,000 $ 2,400,000 $ 0