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Goodwill, Identifiable Intangible Assets, and Other Long-Lived Assets (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Goodwill and Intangible Assets [Line Items]          
Non-cash goodwill impairment charge       $ 225,500,000  
Non-cash expense for impairment of intangible and tangible assets, excluding goodwill $ 0     7,300,000  
Amortization of identifiable intangible assets $ 15,400,000 $ 11,300,000   44,765,000 $ 34,500,000
United States Industrial Services [Member]          
Goodwill and Intangible Assets [Line Items]          
Non-cash goodwill impairment charge       225,500,000  
Weighted average cost of capital used for impairment testing     12.00%    
Perpetual growth rate used for impairment testing     2.00%    
Goodwill Impairment Testing, Effect of Fifty Basis Point Increase in the Weighted Average Costs of Capital     $ 22,900,000    
Goodwill Impairment, Testing Effect of Fifty Basis Point Decrease in the Perpetual Growth Rate     $ 9,000,000.0    
Non-cash expense for impairment of intangible and tangible assets, excluding goodwill       4,800,000  
Non-cash expense for impairment of tangible assets       600,000  
United States Electrical Construction And Facilities Services [Member]          
Goodwill and Intangible Assets [Line Items]          
Non-cash goodwill impairment charge       0  
Trade Names (Unamortized) | United States Industrial Services [Member]          
Goodwill and Intangible Assets [Line Items]          
Non-cash expense for impairment of identifiable intangible assets       4,200,000  
Trade Names (Unamortized) | United States Electrical Construction And Facilities Services [Member]          
Goodwill and Intangible Assets [Line Items]          
Non-cash expense for impairment of identifiable intangible assets       $ 2,500,000