Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2017
Pipelines and related facilities [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	10 years
Pipelines and related facilities [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	31 years
Storage and terminal facilities [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	10 years
Storage and terminal facilities [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	25 years
Natural gas gathering and processing facilities [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	10 years
Natural gas gathering and processing facilities [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	31 years
Trucking equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	3 years
Trucking equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	7 years
Office and other property and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	3 years
Office and other property and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life property, plant and equipment (in years)	31 years