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Business Segments - Financial Information of Partnership's Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information        
Total consolidated revenues $ 180,676 $ 184,531 $ 373,219 $ 365,361
Depreciation and amortization 12,638 12,687 25,454 25,336
(Gain) loss on sale or disposition of property, plant and equipment (613) (953) (1,092) (1,161)
Operating income 14,883 19,927 29,285 37,822
Segment assets - as of June 30, 2024 515,632 535,078 515,632 535,078
Capital expenditures and plant turnaround costs 6,015 13,204 11,623 30,597
Operating Segments        
Segment Reporting Information        
Total consolidated revenues 186,398 190,379 385,319 376,733
Direct product costs 72,822 71,501 157,269 144,131
Manufacturing costs (plant, labor, transportation, and other) 10,655 10,417 21,255 20,220
Segment gross margin 102,921 108,461 206,795 212,382
Employment related expenses 28,584 28,139 57,100 54,446
Driver pay 11,504 13,168 23,585 25,866
Pass-through expenses 6,661 7,139 13,623 15,008
Utilities, materials, and supplies 4,441 3,896 8,965 8,716
Repairs and maintenance 5,610 6,402 11,715 12,393
Insurance related expenses 6,082 7,155 11,785 12,042
Lease expenses 6,136 4,862 12,074 9,826
Other segment expenses 6,995 6,039 14,301 12,088
Depreciation and amortization 12,638 12,687 25,454 25,336
(Gain) loss on sale or disposition of property, plant and equipment (613) (953) (1,092) (1,161)
Operating expenses 88,038 88,534 177,510 174,560
Operating income 14,883 19,927 29,285 37,822
Elimination of intersegment revenues        
Segment Reporting Information        
Total consolidated revenues (5,722) (5,848) (12,100) (11,372)
Indirect selling, general and administrative        
Segment Reporting Information        
Employment related expenses 3,165 3,115 6,259 6,245
Insurance related expenses 3 0 92 0
Other segment expenses 769 704 2,261 1,410
Operating expenses 3,937 3,819 8,612 7,655
Operating income (3,937) (3,819) (8,612) (7,655)
Terminalling and storage        
Segment Reporting Information        
Total consolidated revenues 22,404 22,375 43,953 44,892
Terminalling and storage | Operating Segments        
Segment Reporting Information        
Total consolidated revenues 24,228 24,402 47,642 48,687
Direct product costs 0 0 0 0
Manufacturing costs (plant, labor, transportation, and other) 0 24 0 42
Segment gross margin 24,228 24,378 47,642 48,645
Employment related expenses 6,584 6,465 13,137 12,045
Driver pay 0 0 0 0
Pass-through expenses 0 0 0 0
Utilities, materials, and supplies 3,587 3,073 7,220 7,140
Repairs and maintenance 905 1,280 2,305 2,667
Insurance related expenses 1,560 2,762 3,031 4,258
Lease expenses 1,075 975 2,231 1,941
Other segment expenses 2,114 1,787 3,637 3,608
Depreciation and amortization 5,411 5,729 10,980 11,124
(Gain) loss on sale or disposition of property, plant and equipment (8) (995) (9) (1,097)
Operating expenses 21,228 21,076 42,532 41,686
Operating income 3,000 3,302 5,110 6,959
Segment assets - as of June 30, 2024 159,001 179,047 159,001 179,047
Capital expenditures and plant turnaround costs 1,925 2,075 2,847 9,125
Terminalling and storage | Elimination of intersegment revenues        
Segment Reporting Information        
Total consolidated revenues (1,824) (2,027) (3,689) (3,795)
Transportation segment        
Segment Reporting Information        
Total consolidated revenues 53,826 57,676 106,811 115,983
Transportation segment | Operating Segments        
Segment Reporting Information        
Total consolidated revenues 57,701 61,467 115,176 123,509
Direct product costs 0 0 0 0
Manufacturing costs (plant, labor, transportation, and other) 0 0 0 0
Segment gross margin 57,701 61,467 115,176 123,509
Employment related expenses 15,183 14,796 30,436 29,537
Driver pay 11,504 13,168 23,585 25,866
Pass-through expenses 5,884 6,506 11,982 13,679
Utilities, materials, and supplies 587 605 1,196 1,118
Repairs and maintenance 4,481 5,041 8,976 9,501
Insurance related expenses 4,296 4,239 8,246 7,434
Lease expenses 4,920 3,746 9,555 7,618
Other segment expenses 2,313 2,209 4,707 4,398
Depreciation and amortization 2,916 3,381 5,848 6,857
(Gain) loss on sale or disposition of property, plant and equipment (600) (260) (1,078) (366)
Operating expenses 51,484 53,431 103,453 105,642
Operating income 6,217 8,036 11,723 17,867
Segment assets - as of June 30, 2024 162,974 164,571 162,974 164,571
Capital expenditures and plant turnaround costs 2,077 1,770 4,899 4,625
Transportation segment | Elimination of intersegment revenues        
Segment Reporting Information        
Total consolidated revenues (3,875) (3,791) (8,365) (7,526)
Sulfur services segment        
Segment Reporting Information        
Total consolidated revenues 44,128 37,192 92,832 70,873
Sulfur services segment | Operating Segments        
Segment Reporting Information        
Total consolidated revenues 44,128 37,193 92,832 70,874
Direct product costs 22,604 16,735 49,424 35,179
Manufacturing costs (plant, labor, transportation, and other) 6,707 5,448 11,889 9,775
Segment gross margin 14,817 15,010 31,519 25,920
Employment related expenses 2,221 2,246 4,384 4,081
Driver pay 0 0 0 0
Pass-through expenses 777 633 1,641 1,329
Utilities, materials, and supplies 236 186 491 395
Repairs and maintenance 215 74 424 215
Insurance related expenses 179 125 339 295
Lease expenses 110 113 235 201
Other segment expenses 1,555 1,084 3,208 2,188
Depreciation and amortization 3,556 2,778 7,113 5,760
(Gain) loss on sale or disposition of property, plant and equipment (1) 308 (1) 308
Operating expenses 8,848 7,547 17,834 14,772
Operating income 5,969 7,463 13,685 11,148
Segment assets - as of June 30, 2024 128,266 112,644 128,266 112,644
Capital expenditures and plant turnaround costs 1,587 8,561 3,328 14,897
Sulfur services segment | Elimination of intersegment revenues        
Segment Reporting Information        
Total consolidated revenues 0 (1) 0 (1)
Specialty Products        
Segment Reporting Information        
Total consolidated revenues 60,318 67,288 129,623 133,613
Specialty Products | Operating Segments        
Segment Reporting Information        
Total consolidated revenues 60,341 67,317 129,669 133,663
Direct product costs 50,218 54,766 107,845 108,952
Manufacturing costs (plant, labor, transportation, and other) 3,948 4,945 9,366 10,403
Segment gross margin 6,175 7,606 12,458 14,308
Employment related expenses 1,431 1,517 2,884 2,538
Driver pay 0 0 0 0
Pass-through expenses 0 0 0 0
Utilities, materials, and supplies 31 32 58 63
Repairs and maintenance 9 7 10 10
Insurance related expenses 44 29 77 55
Lease expenses 31 28 53 66
Other segment expenses 244 255 488 484
Depreciation and amortization 755 799 1,513 1,595
(Gain) loss on sale or disposition of property, plant and equipment (4) (6) (4) (6)
Operating expenses 2,541 2,661 5,079 4,805
Operating income 3,634 4,945 7,379 9,503
Segment assets - as of June 30, 2024 65,391 78,816 65,391 78,816
Capital expenditures and plant turnaround costs 426 798 549 1,950
Specialty Products | Elimination of intersegment revenues        
Segment Reporting Information        
Total consolidated revenues $ (23) $ (29) $ (46) $ (50)