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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]        
Loss on contracts     $ 0  
Settlement of contract claim   $ 0    
Unbilled revenues for unapproved change orders $ 18,900,000 21,600,000 18,900,000  
Claims on uncompleted contracts 900,000 6,000,000 900,000  
Accounts receivable, unapproved contract claims 300,000 0 300,000  
Accounts receivable, contractually billed amounts on contracts related to unapproved contract claims 52,000,000 80,500,000 52,000,000  
Accounts receivable, retainage 189,200,000 $ 222,600,000 189,200,000  
Accounts receivable, retainage estimated to be collected in next fiscal year   77.00%    
Accounts payable, retainage 34,600,000 $ 40,100,000 34,600,000  
Accounts payable, retainage estimated to be paid in next fiscal year   74.00%    
Accounts receivable, net 1,359,862,000 $ 1,495,431,000 1,359,862,000  
Allowance for doubtful accounts 11,175,000 12,252,000 11,175,000  
Provision for doubtful accounts   6,194,000 2,853,000 $ 2,918,000
Non-cash expense for impairment of property, plant and equipment   $ 0 0 $ 0
Minimum        
Property, Plant and Equipment [Line Items]        
Contract terms   1 month    
Maximum        
Property, Plant and Equipment [Line Items]        
Contract terms   4 years    
Machinery and Equipment | Minimum        
Property, Plant and Equipment [Line Items]        
Estimated useful life   3 years    
Machinery and Equipment | Maximum        
Property, Plant and Equipment [Line Items]        
Estimated useful life   10 years    
Vehicles, Furniture and Fixtures, and Computer Hardware and Software | Minimum        
Property, Plant and Equipment [Line Items]        
Estimated useful life   3 years    
Vehicles, Furniture and Fixtures, and Computer Hardware and Software | Maximum        
Property, Plant and Equipment [Line Items]        
Estimated useful life   7 years    
Buildings        
Property, Plant and Equipment [Line Items]        
Estimated useful life   25 years    
United States Mechanical Construction And Facilities Services        
Property, Plant and Equipment [Line Items]        
Settlement of contract claim 12,100,000   12,100,000  
Other Current Liabilities        
Property, Plant and Equipment [Line Items]        
Insurance liabilities, current 29,900,000 $ 42,500,000 29,900,000  
Other Noncurrent Liabilities        
Property, Plant and Equipment [Line Items]        
Insurance liabilities, noncurrent $ 114,300,000 167,900,000 $ 114,300,000  
Prepaid Expenses and Other        
Property, Plant and Equipment [Line Items]        
Anticipated insurance recoveries, current   10,800,000    
Other Assets        
Property, Plant and Equipment [Line Items]        
Anticipated insurance recoveries, noncurrent   43,000,000    
Accounting Standards Update 2016-09 [Member]        
Property, Plant and Equipment [Line Items]        
Cumulative adjustment to retained earnings for tax benefits   1,000,000    
Transportation Sector [Member] | United States Electrical Construction And Facilities Services        
Property, Plant and Equipment [Line Items]        
Loss on contracts   19,400,000    
Manufacturing Sector [Member] | United States Mechanical Construction And Facilities Services        
Property, Plant and Equipment [Line Items]        
Loss on contracts   18,300,000    
Institutional Sector [Member] | United States Mechanical Construction And Facilities Services        
Property, Plant and Equipment [Line Items]        
Loss on contracts   $ 9,600,000