Leases - Additional Information (Details)	9 Months Ended
	Sep. 30, 2015
Operating Leased Assets [Line Items]
Operating leases placed in services dates description	SDTS and SPLLC have entered into various leases with Sharyland for all of our placed in service T&D assets. The master lease agreements, as amended, expire at various dates from December 31, 2015 through December 31, 2022.
Lease expiration date range, start date	Dec. 31, 2015
Lease expiration date range, end date	Dec. 31, 2022
Maximum [Member]
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%