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Goodwill, Identifiable Intangible Assets, and Other Long-Lived Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Goodwill and Intangible Assets [Line Items]        
Non-cash goodwill impairment charge     $ 225,500  
Non-cash expense for impairment of intangible and tangible assets, excluding goodwill $ 7,300      
Amortization of identifiable intangible assets 14,700 $ 11,600 29,404 $ 23,169
United States Industrial Services [Member]        
Goodwill and Intangible Assets [Line Items]        
Non-cash goodwill impairment charge 225,500   $ 225,500  
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  
Goodwill Impairment, Testing Effect of Fifty Basis Point Decrease in the Perpetual Growth Rate     9,000  
Non-cash expense for impairment of intangible and tangible assets, excluding goodwill 4,800      
Non-cash expense for impairment of tangible assets 600      
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      
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