Acquisitions - Partnership's Consolidated (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	[1]
Business Acquisition [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
Selling, general and administrative	[2]									41,433	39,116	[1]	39,080
Depreciation and amortization										60,060	61,484	[1],[3]	65,108	[3]
Total costs and expenses										803,601	976,088	[1]	929,866
Other operating income, net										14,587	1,041	[1]	2,096
Operating income		18,027	25,461	5,010	9,606	14,309	5,431	4,489	20,828	58,104	45,057	[1]	45,616
Interest expense										(51,690)	(52,349)	[1]	(47,770)
Other, net										6	38	[1]	1,129
Net income (loss) before taxes										6,420	(7,254)	[1]	(1,025)
Income tax expense (benefit)										1,900	577	[1]	158
Net income (loss)		$ 6,642	$ 13,250	$ (191,182)	$ (3,656)	$ 2,582	$ 42,563	$ (4,526)	$ 15,036	(174,946)	55,655	[1],[3]	19,916	[3]
Martin Transport Inc. Stock Purchase Agreement
Business Acquisition [Line Items]
Operating expenses										105,212	104,304
Selling, general and administrative										5,246	4,449
Depreciation and amortization										3,413	2,284
Total costs and expenses										113,871	111,037
Other operating income, net										596	1,491
Operating income										12,058	2,581
Interest expense										(312)	(26)
Other, net										12	33
Net income (loss) before taxes										11,758	2,588
Income tax expense (benefit)										208	(193)
Net income (loss)										11,550	2,781
Transportation revenue
Business Acquisition [Line Items]
Revenues	[2]									159,622	150,121	[1]	$ 135,350
Transportation revenue | Martin Transport Inc. Stock Purchase Agreement
Business Acquisition [Line Items]
Revenues										$ 125,333	$ 112,127

[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

[3] 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.