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Business Segments - Income Statement (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information      
Revenues $ (707,622) $ (797,963) $ (1,018,878)
Depreciation and amortization 50,787 49,895 56,280
(Gain) loss on sale or disposition of property, plant and equipment (1,584) (1,373) (5,669)
Costs and expenses 651,911 732,612 973,284
Operating income (loss) 57,295 66,724 51,263
Segment assets 538,509 509,375 598,851
Capital expenditures and plant turnaround costs 52,623 40,136 31,133
Operating Segments      
Segment Reporting Information      
Revenues (731,079) (824,243) (1,051,687)
Direct product costs 275,968 369,007 576,094
Manufacturing costs (plant, labor, transportation, and other) 41,490 44,109 76,986
Segment gross margin 413,621 411,127 398,607
Employment related expenses 113,952 105,477 102,290
Driver pay 50,573 52,650 52,178
Pass-through expenses 27,379 30,853 38,343
Utilities, materials, and supplies 16,776 20,379 21,479
Repairs and maintenance 24,716 27,226 25,511
Insurance related expenses 23,677 19,462 16,774
Lease expenses 21,351 15,833 15,230
Other segment expenses 28,699 24,001 24,928
Depreciation and amortization 50,787 49,895 56,280
(Gain) loss on sale or disposition of property, plant and equipment (1,584) (1,373) (5,669)
Costs and expenses 356,326 344,403 347,344
Operating income (loss) 57,295 66,724 51,263
Elimination of intersegment revenues      
Segment Reporting Information      
Revenues 23,457 26,280 32,809
Indirect selling, general and administrative      
Segment Reporting Information      
Employment related expenses 12,267 12,755 13,715
Insurance related expenses 825   2
Other segment expenses 6,464 3,275 3,197
Costs and expenses 19,556 16,030 16,914
Operating income (loss) (19,556) (16,030) (16,914)
Indirect selling, general and administrative | Martin Resource Management Corporation      
Segment Reporting Information      
Other segment expenses 3,674    
Terminalling and storage      
Segment Reporting Information      
Revenues (89,067) (86,514) (80,193)
Terminalling and storage | Operating Segments      
Segment Reporting Information      
Revenues (96,555) (95,459) (92,612)
Direct product costs 0 0 0
Manufacturing costs (plant, labor, transportation, and other) 72 75 19
Segment gross margin 96,483 95,384 92,593
Employment related expenses 25,714 23,018 22,612
Driver pay 0 0 0
Pass-through expenses 0 0 13
Utilities, materials, and supplies 13,591 16,863 17,996
Repairs and maintenance 5,776 4,259 3,937
Insurance related expenses 6,914 4,525 4,964
Lease expenses 4,268 3,779 8,432
Other segment expenses 7,470 7,019 7,190
Depreciation and amortization 22,757 21,030 26,094
(Gain) loss on sale or disposition of property, plant and equipment (1,105) 359 166
Costs and expenses 85,385 80,852 91,404
Operating income (loss) 11,098 14,532 1,189
Segment assets 180,769 171,320 184,537
Capital expenditures and plant turnaround costs 13,764 13,168 15,308
Terminalling and storage | Elimination of intersegment revenues      
Segment Reporting Information      
Revenues 7,488 8,945 12,419
Transportation      
Segment Reporting Information      
Revenues (223,934) (223,677) (219,008)
Transportation | Operating Segments      
Segment Reporting Information      
Revenues (239,807) (240,926) (239,275)
Direct product costs 0 0 0
Manufacturing costs (plant, labor, transportation, and other) 0 0 0
Segment gross margin 239,807 240,926 239,275
Employment related expenses 60,882 56,244 50,626
Driver pay 50,573 52,650 52,178
Pass-through expenses 24,454 27,196 33,998
Utilities, materials, and supplies 2,254 2,134 2,172
Repairs and maintenance 18,219 22,582 20,900
Insurance related expenses 15,083 14,056 10,499
Lease expenses 16,548 11,544 6,352
Other segment expenses 9,296 7,715 7,688
Depreciation and amortization 13,027 14,879 14,567
(Gain) loss on sale or disposition of property, plant and equipment (713) (1,775) (1,062)
Costs and expenses 209,623 207,225 197,918
Operating income (loss) 30,184 33,701 41,357
Segment assets 165,093 161,506 153,451
Capital expenditures and plant turnaround costs 9,188 7,598 7,619
Transportation | Elimination of intersegment revenues      
Segment Reporting Information      
Revenues 15,873 17,249 20,267
Sulfur Services      
Segment Reporting Information      
Revenues (129,771) (140,995) (179,164)
Sulfur Services | Operating Segments      
Segment Reporting Information      
Revenues (129,772) (140,995) (179,164)
Direct product costs 58,102 75,002 96,793
Manufacturing costs (plant, labor, transportation, and other) 21,882 18,839 30,225
Segment gross margin 49,788 47,154 52,146
Employment related expenses 9,148 7,997 8,137
Driver pay 0 0 0
Pass-through expenses 2,925 3,657 4,332
Utilities, materials, and supplies 794 1,225 1,131
Repairs and maintenance 706 340 613
Insurance related expenses 730 759 1,115
Lease expenses 414 375 303
Other segment expenses 4,473 4,716 5,785
Depreciation and amortization 11,769 10,690 11,099
(Gain) loss on sale or disposition of property, plant and equipment 298 (17) (4,555)
Costs and expenses 31,257 29,742 27,960
Operating income (loss) 18,531 17,412 24,186
Segment assets 126,074 103,779 110,688
Capital expenditures and plant turnaround costs 26,380 16,851 6,857
Sulfur Services | Elimination of intersegment revenues      
Segment Reporting Information      
Revenues 1 0 0
Specialty Products      
Segment Reporting Information      
Revenues (264,850) (346,777) (540,513)
Specialty Products | Operating Segments      
Segment Reporting Information      
Revenues (264,945) (346,863) (540,636)
Direct product costs 217,866 294,005 479,301
Manufacturing costs (plant, labor, transportation, and other) 19,536 25,195 46,742
Segment gross margin 27,543 27,663 14,593
Employment related expenses 5,941 5,463 7,200
Driver pay 0 0 0
Pass-through expenses 0 0 0
Utilities, materials, and supplies 137 157 180
Repairs and maintenance 15 45 61
Insurance related expenses 125 122 194
Lease expenses 121 135 143
Other segment expenses 996 1,276 1,068
Depreciation and amortization 3,234 3,296 4,520
(Gain) loss on sale or disposition of property, plant and equipment (64) (60) 218
Costs and expenses 10,505 10,554 13,148
Operating income (loss) 17,038 17,109 1,445
Segment assets 66,573 72,770 150,175
Capital expenditures and plant turnaround costs 3,291 2,519 1,349
Specialty Products | Elimination of intersegment revenues      
Segment Reporting Information      
Revenues $ 95 $ 86 $ 123