Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues		$ 241,862	$ 177,900	$ 187,323	$ 240,033	$ 267,175	$ 234,047	$ 227,164	$ 291,718	$ 847,118	$ 1,020,104	[1]	$ 973,386	[1]
Lubricant product sales
Disaggregation of Revenue [Line Items]
Revenues	[2]									122,257	145,236	[1]	130,392	[1]
Throughput and storage
Disaggregation of Revenue [Line Items]
Revenues	[2]									87,397	96,204	[1]	99,643	[1]
Sulfur services
Disaggregation of Revenue [Line Items]
Revenues										11,434	11,148	[1]	10,952	[1]
Natural gas liquids product sales
Disaggregation of Revenue [Line Items]
Revenues	[2]									366,502	496,007	[1]	473,317	[1]
Terminalling and storage segment
Disaggregation of Revenue [Line Items]
Revenues										209,654	241,440		230,035
Terminalling and storage segment | Lubricant product sales
Disaggregation of Revenue [Line Items]
Revenues										122,257	145,236		130,392
Terminalling and storage segment | Throughput and storage
Disaggregation of Revenue [Line Items]
Revenues										87,397	96,204		99,643
Transportation segment
Disaggregation of Revenue [Line Items]
Revenues										159,622	150,121		135,350
Transportation segment | Land transportation
Disaggregation of Revenue [Line Items]
Revenues										98,895	99,751		86,771
Transportation segment | Inland transportation
Disaggregation of Revenue [Line Items]
Revenues										54,834	44,580		42,874
Transportation segment | Offshore transportation
Disaggregation of Revenue [Line Items]
Revenues										5,893	5,790		5,705
Sulfur service segment
Disaggregation of Revenue [Line Items]
Revenues										111,340	132,536		134,684
Sulfur service segment | Sulfur product sales
Disaggregation of Revenue [Line Items]
Revenues										30,135	46,347		49,204
Sulfur service segment | Fertilizer product sales
Disaggregation of Revenue [Line Items]
Revenues										69,771	75,041		74,528
Sulfur service segment | Sulfur services
Disaggregation of Revenue [Line Items]
Revenues										11,434	11,148		10,952
Natural gas liquids segment
Disaggregation of Revenue [Line Items]
Revenues										366,502	496,007		473,317
Natural gas liquids segment | Natural gas liquids product sales
Disaggregation of Revenue [Line Items]
Revenues										$ 366,502	$ 496,007		$ 473,317

[1] Financial information has been revised to include results attributable to MTI acquired from Martin Resource Management Corporation. See Note 2 – Significant Accounting Policies and Practices.

[2] *Related Party Transactions Included Above   Year Ended December 31,   2019   2018¹   2017¹ Revenues:           Terminalling and storage $ 71,733
  $ 79,137
  $ 82,142
Transportation 24,243
  27,588
  29,807
Natural gas liquids —
  —
  122
Product sales 931
  1,297
  3,497
Costs and expenses:  
   
   
Cost of products sold: (excluding depreciation and amortization)  
   
   
Natural gas liquids —
  —
  4,354
Sulfur services 10,765
  10,641
  9,345
          Terminalling and storage 23,859
  24,613
  16,672
Expenses:  
   
   
Operating expenses 88,194
  90,878
  95,546
Selling, general and administrative 32,622
  26,441
  26,393