Related-Party Transactions - Additional Information (Details)	9 Months Ended
	Sep. 30, 2017 USD ($) property	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items]
Operating leases, year two	$ 426,000
Operating leases, year three	366,000
Operating leases, year four	344,000
Payable to related parties	0		$ 0
Receivable from related parties	$ 40,000		$ 40,000
Related party leasing
Related Party Transaction [Line Items]
Number of properties adjacent to corporate office subject to leases | property	5
Related party transportation services
Related Party Transaction [Line Items]
Expenses with related party	$ 210,000	$ 120,000
Related party equipment rental
Related Party Transaction [Line Items]
Expenses with related party	$ 140,000	$ 140,000
Corporate offices | Related party leasing
Related Party Transaction [Line Items]
Lease term	5 years
Extension option term	5 years
Operating leases	$ 70,000
Property 1 | Related party leasing
Related Party Transaction [Line Items]
Operating leases	30,000
Operating leases, year two	30,000
Operating leases, year three	90,000
Operating leases, year four	90,000
Operating leases, year five	$ 180,000