Leases - Additional Information (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating Leased Assets [Line Items]
Operating leases placed in services dates description		SDTS has entered into various leases with Sharyland for all the Company’s placed in service T&D assets. The master lease agreements, as amended, expire at various dates from December 31, 2017 through December 31, 2022.
Lease expiration date range, start date		Dec. 31, 2017
Lease expiration date range, end date		Dec. 31, 2022
Maximum
Operating Leased Assets [Line Items]
Rate of rent used, Percentage		37.00%
Minimum
Operating Leased Assets [Line Items]
Rate of rent used, Percentage		23.00%
Scenario, Forecast | Maximum
Operating Leased Assets [Line Items]
Rate of rent used, Percentage	31.00%
Scenario, Forecast | Minimum
Operating Leased Assets [Line Items]
Rate of rent used, Percentage	23.00%