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Leased Properties and Leases - Additional Information (Details)

v3.8.0.1
Leased Properties and Leases - Additional Information (Details)
bbl / d in Thousands, bbl in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
a
bbl / d
facility
tank
leased_property
mi
bbl
Sale Leaseback Transaction [Line Items]  
Number of significant leased properties | leased_property 3
Minimum [Member]  
Sale Leaseback Transaction [Line Items]  
Initial Lease Term 11 years
Maximum [Member]  
Sale Leaseback Transaction [Line Items]  
Initial Lease Term 15 years
Grand Isle Gathering System [Member]  
Sale Leaseback Transaction [Line Items]  
Initial Lease Term 11 years
Renewal Option 9 years
Renewal Term, percentage of remaining useful life 75.00%
Length of offshore pipeline (in miles) | mi 153
Pipeline capacity (in bbl/day) | bbl / d 120
Number of acres in the onshore terminal and saltwater disposal system (in acres) | a 16
Current Monthly Rent Payments $ 2,854,667
Expected future monthly rent payments $ 2,860,917
Initial Estimated Useful Life 27 years
Pinedale Liquids Gathering System [Member]  
Sale Leaseback Transaction [Line Items]  
Initial Lease Term 15 years
Renewal Option 5 years
Length of offshore pipeline (in miles) | mi 150
Number of storage facilities | facility 4
Current Monthly Rent Payments $ 1,776,772
Initial Estimated Useful Life 26 years
Portland Terminal Facility [Member]  
Sale Leaseback Transaction [Line Items]  
Initial Lease Term 15 years
Renewal Option 5 years
Acres owned (in acres) | a 39
Number of tanks | tank 84
Crude oil and petroleum product storage capacity (in bbl) | bbl 1.5
Current Monthly Rent Payments $ 513,355
Initial Estimated Useful Life 30 years
Exercise period of purchase option 90 days