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Related-Party Transactions - Additional Information (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
property
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
property
Dec. 31, 2015
USD ($)
Related Party Transaction [Line Items]        
Operating leases, year 2 $ 426,000   $ 426,416  
Operating leases, year 3 366,000   366,416  
Operating leases, year 4 344,000   343,916  
Payable to related parties 0   0 $ 0
Receivable from related parties $ 40,000   $ 35,000 18,000
Related party leasing        
Related Party Transaction [Line Items]        
Lease term     5 years  
Extension option term     5 years  
Operating leases, year 2     $ 72,000  
Operating leases, year 3     72,000  
Operating leases, year 4     72,000  
Operating leases, year 5     $ 72,000  
Number of properties adjacent to corporate office subject to leases | property 5   5  
Expenses with related party     $ 72,000  
Related party transportation services        
Related Party Transaction [Line Items]        
Expenses with related party $ 210,000 $ 120,000 186,000 164,000
Related party equipment rental        
Related Party Transaction [Line Items]        
Expenses with related party $ 140,000 $ 140,000 192,000 $ 192,000
Corporate offices [Member] | Related party leasing        
Related Party Transaction [Line Items]        
Lease term 5 years      
Extension option term 5 years      
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 70,000      
Property 1 | Related party leasing        
Related Party Transaction [Line Items]        
Operating Leases, Future Minimum Payments Due, Next Twelve Months 30,000      
Operating leases, year 2 30,000      
Operating leases, year 3 90,000      
Operating leases, year 4 90,000      
Operating leases, year 5 $ 180,000      
Expenses with related party     30,000  
Property 2 | Related party leasing        
Related Party Transaction [Line Items]        
Expenses with related party     30,000  
Property 3 | Related party leasing        
Related Party Transaction [Line Items]        
Expenses with related party     90,000  
Property 4 | Related party leasing        
Related Party Transaction [Line Items]        
Expenses with related party     90,000  
Property 5 | Related party leasing        
Related Party Transaction [Line Items]        
Expenses with related party     $ 180,000