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Summary of Business and Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
reporting_unit
segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2019
USD ($)
Financing Receivable, Impaired [Line Items]        
Ownership interest in joint venture, entity is consolidated 50.00%      
Contract receivable retainage $ 47,400,000 $ 43,500,000    
Unbilled contracts receivable 0 0    
Allowance for doubtful accounts 0 0    
Inventories 3,159,000 4,621,000    
Depreciation 14,200,000 15,100,000 $ 15,700,000  
Capital lease obligations 200,000 300,000    
Impairment long-lived assets $ 0 0 0  
Number of reportable segments | segment 2      
Number of reporting units | reporting_unit 2      
Operating leases, remaining terms 4 years      
Retainage estimated to collect 75.00%      
Costs and Estimated Earnings in Excess of Billings        
Financing Receivable, Impaired [Line Items]        
Unpaid project contract price $ 9,300,000 10,000,000    
Minimum        
Financing Receivable, Impaired [Line Items]        
Revenue recognition, percentage of completion range 12 months      
Warranty term 1 year      
Lessee, operating lease, discount rate 5.00%      
Maximum        
Financing Receivable, Impaired [Line Items]        
Revenue recognition, percentage of completion range 36 months      
Warranty term 2 years      
Lessee, operating lease, discount rate 8.00%      
JBC Former Owners        
Financing Receivable, Impaired [Line Items]        
Business acquisition earn-out expense   1,300,000 $ 1,200,000  
Tealstone        
Financing Receivable, Impaired [Line Items]        
Business acquisition earn-out expense $ 1,600,000 $ 400,000    
Building and improvements | Minimum        
Financing Receivable, Impaired [Line Items]        
Property, plant and equipment, useful life 5 years      
Building and improvements | Maximum        
Financing Receivable, Impaired [Line Items]        
Property, plant and equipment, useful life 39 years      
Plant and field equipment | Minimum        
Financing Receivable, Impaired [Line Items]        
Property, plant and equipment, useful life 5 years      
Plant and field equipment | Maximum        
Financing Receivable, Impaired [Line Items]        
Property, plant and equipment, useful life 15 years      
Forecast | Subsequent Event | Minimum        
Financing Receivable, Impaired [Line Items]        
Operating lease, right-of-use asset       $ 14,000,000
Operating lease, right-of-use liability       14,000,000
Forecast | Subsequent Event | Maximum        
Financing Receivable, Impaired [Line Items]        
Operating lease, right-of-use asset       16,000,000
Operating lease, right-of-use liability       $ 16,000,000