Revenue - Estimated Revenue Expected to be Recognized in Future (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 570,054
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 15,902
Revenue, remaining performance obligation, expected timing of satisfaction, period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 60,298
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 55,273
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 55,439
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 43,829
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 339,313
Revenue, remaining performance obligation, expected timing of satisfaction, period
Terminalling and storage segment | Terminalling and storage
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 518,039
Terminalling and storage segment | Terminalling and storage | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 11,575
Revenue, remaining performance obligation, expected timing of satisfaction, period	3 months
Terminalling and storage segment | Terminalling and storage | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 43,273
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Terminalling and storage segment | Terminalling and storage | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 40,394
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Terminalling and storage segment | Terminalling and storage | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 41,605
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Terminalling and storage segment | Terminalling and storage | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 42,854
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Terminalling and storage segment | Terminalling and storage | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 338,338
Revenue, remaining performance obligation, expected timing of satisfaction, period
Sulfur services segment | Sulfur services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 52,015
Sulfur services segment | Sulfur services | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 4,327
Revenue, remaining performance obligation, expected timing of satisfaction, period	3 months
Sulfur services segment | Sulfur services | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 17,025
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Sulfur services segment | Sulfur services | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 14,879
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Sulfur services segment | Sulfur services | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 13,834
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Sulfur services segment | Sulfur services | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 975
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Sulfur services segment | Sulfur services | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Revenue, remaining performance obligation	$ 975
Revenue, remaining performance obligation, expected timing of satisfaction, period