Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Details)

v3.7.0.1
Related-Party Transactions - Additional Information (Details)
6 Months Ended
Jun. 30, 2017
USD ($)
property
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Related Party Transaction [Line Items]      
Payable to related parties $ 40,000   $ 0
Receivable from related parties $ 20,000   $ 40,000
Related party leasing      
Related Party Transaction [Line Items]      
Lease term 5 years    
Extension option term 5 years    
Number of properties adjacent to corporate office subject to leases | property 5    
Operating leases $ 70,000    
Related party transportation services      
Related Party Transaction [Line Items]      
Expenses with related party 120,000 $ 60,000  
Related party equipment rental      
Related Party Transaction [Line Items]      
Expenses with related party 100,000 $ 100,000  
Property 1 | Related party leasing      
Related Party Transaction [Line Items]      
Operating leases 30,000    
Property 2 | Related party leasing      
Related Party Transaction [Line Items]      
Operating leases 30,000    
Property 3 | Related party leasing      
Related Party Transaction [Line Items]      
Operating leases 90,000    
Property 4 | Related party leasing      
Related Party Transaction [Line Items]      
Operating leases 90,000    
Property 5 | Related party leasing      
Related Party Transaction [Line Items]      
Operating leases $ 180,000