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Goodwill and Identifiable Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Oct. 01, 2015
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets[Line Items]                        
Goodwill   $ 843,170       $ 834,102       $ 843,170 $ 834,102 $ 834,825
Goodwill acquired                   9,100    
Non-cash goodwill impairment charge                   0 0 0
Non-cash expense for impairment of identifiable intangible assets   0 $ 0 $ 0 $ 0 1,471 $ 0 $ 0 $ 0 0 1,471 0
Non-cash impairment charge of finite-lived intangible assets                   0 0 0
Accumulated impairment charge                       210,600
Indefinite-lived intangible asset acquired                   $ 8,700 0  
Amortization periods                   11 years    
Amortization of identifiable intangible assets                   $ 37,895 37,966 31,028
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   384,639       384,639       $ 384,639 384,639 384,543
Goodwill allocated                   45.60%    
Weighted average cost of capital used in annual testing for impairment 11.00%                      
Accumulated impairment charge                       71,100
United States Building Services                        
Goodwill and Intangible Assets[Line Items]                        
Goodwill   228,637       228,385       $ 228,637 228,385 229,204
Goodwill allocated                   27.10%    
Weighted average cost of capital used in annual testing for impairment 11.10%                      
Accumulated impairment charge                       139,500
Domestic Construction                        
Goodwill and Intangible Assets[Line Items]                        
Weighted average cost of capital used in annual testing for impairment 11.10%                      
United States Mechanical Construction And Facilities Services                        
Goodwill and Intangible Assets[Line Items]                        
Goodwill   226,071       217,255       $ 226,071 217,255 217,255
Goodwill allocated                   26.80%    
United States Electrical Construction And Facilities Services                        
Goodwill and Intangible Assets[Line Items]                        
Goodwill   $ 3,823       $ 3,823       $ 3,823 3,823 3,823
Goodwill allocated                   0.50%    
Developed technology/Vendor network                        
Goodwill and Intangible Assets[Line Items]                        
Amortization periods                   11 years 6 months    
Customer relationships                        
Goodwill and Intangible Assets[Line Items]                        
Amortization periods                   11 years    
Non-competition agreements                        
Goodwill and Intangible Assets[Line Items]                        
Amortization periods                   1 year 6 months    
Trade names (amortized)                        
Goodwill and Intangible Assets[Line Items]                        
Amortization periods                   4 years    
Trade names (unamortized)                        
Goodwill and Intangible Assets[Line Items]                        
Non-cash expense for impairment of identifiable intangible assets                   $ 0 $ 1,471 $ 0