Summary of Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items]
Impairment of intangible assets	$ 0	$ 0	$ 0
Impairment of goodwill	$ 0	$ 0	$ 0
Minimum [Member] | Crude oil pipelines and natural gas pipelines and related assets
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment	5 years
Minimum [Member] | Marine Vessels [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment	20 years
Minimum [Member] | Onshore facilities, machinery, and equipment
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment	5 years
Minimum [Member] | Transportation equipment
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment	3 years
Minimum [Member] | Building And Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment	3 years
Maximum [Member] | Crude oil pipelines and natural gas pipelines and related assets
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment	40 years
Maximum [Member] | Marine Vessels [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment	30 years
Maximum [Member] | Onshore facilities, machinery, and equipment
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment	30 years
Maximum [Member] | Transportation equipment
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment	7 years
Maximum [Member] | Building And Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of property and equipment	10 years
Poseidon Oil Pipeline Company [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity investment, ownership percentage	64.00%
Neptune Pipeline Company LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity investment, ownership percentage	25.70%
Odyssey Pipeline L.L.C. [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity investment, ownership percentage	29.00%