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Business Segments - Financial Information of Partnership's Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information        
Total consolidated revenues $ 168,717 $ 170,934 $ 541,936 $ 536,295
Depreciation and amortization 12,336 12,608 37,790 37,944
(Gain) loss on sale or disposition of property, plant and equipment (395) (159) (1,487) (1,320)
Operating income 6,894 12,651 36,179 50,473
Segment assets - as of September 30, 2024 510,122 554,757 510,122 554,757
Capital expenditures and plant turnaround costs 11,044 12,535 22,667 43,132
Operating Segments        
Segment Reporting Information        
Total consolidated revenues 174,706 176,495 560,025 553,228
Direct product costs 69,412 63,991 226,681 208,123
Manufacturing costs (plant, labor, transportation, and other) 11,555 11,769 32,810 31,988
Segment gross margin 93,739 100,735 300,534 313,117
Employment related expenses 28,224 29,544 85,323 83,991
Driver pay 11,305 12,393 34,891 38,260
Pass-through expenses 6,465 6,081 20,088 21,088
Utilities, materials, and supplies 4,483 3,942 13,448 12,658
Repairs and maintenance 5,620 6,033 17,333 18,424
Insurance related expenses 6,300 5,476 18,085 17,520
Lease expenses 6,672 5,606 18,746 15,432
Other segment expenses 5,836 6,560 20,138 18,647
Depreciation and amortization 12,336 12,608 37,790 37,944
(Gain) loss on sale or disposition of property, plant and equipment (396) (159) (1,487) (1,320)
Operating expenses 86,845 88,084 264,355 262,644
Operating income 6,894 12,651 36,179 50,473
Elimination of intersegment revenues        
Segment Reporting Information        
Total consolidated revenues (5,989) (5,561) (18,089) (16,933)
Indirect selling, general and administrative        
Segment Reporting Information        
Employment related expenses 3,036 3,026 9,295 9,271
Insurance related expenses 13 0 105 0
Other segment expenses 818 716 3,079 2,126
Operating expenses 3,867 3,742 12,479 11,397
Operating income (3,867) (3,742) (12,479) (11,397)
Terminalling and storage        
Segment Reporting Information        
Total consolidated revenues 23,930 22,562 67,883 67,454
Terminalling and storage | Operating Segments        
Segment Reporting Information        
Total consolidated revenues 25,799 24,414 73,441 73,101
Direct product costs 0 0 0 0
Manufacturing costs (plant, labor, transportation, and other) 0 23 0 65
Segment gross margin 25,799 24,391 73,441 73,036
Employment related expenses 6,727 6,726 19,863 18,771
Driver pay 0 0 0 0
Pass-through expenses 0 0 0 0
Utilities, materials, and supplies 3,563 3,151 10,783 10,291
Repairs and maintenance 883 1,436 3,188 4,103
Insurance related expenses 1,558 1,501 4,589 5,759
Lease expenses 1,111 1,179 3,343 3,120
Other segment expenses 2,235 1,994 5,872 5,602
Depreciation and amortization 5,143 5,695 16,123 16,819
(Gain) loss on sale or disposition of property, plant and equipment 2 34 (7) (1,063)
Operating expenses 21,222 21,716 63,754 63,402
Operating income 4,577 2,675 9,687 9,634
Segment assets - as of September 30, 2024 155,876 192,058 155,876 192,058
Capital expenditures and plant turnaround costs 2,808 2,193 5,655 11,318
Terminalling and storage | Elimination of intersegment revenues        
Segment Reporting Information        
Total consolidated revenues (1,869) (1,852) (5,558) (5,647)
Transportation segment        
Segment Reporting Information        
Total consolidated revenues 49,709 56,506 156,520 172,489
Transportation segment | Operating Segments        
Segment Reporting Information        
Total consolidated revenues 53,790 60,196 168,966 183,705
Direct product costs 0 0 0 0
Manufacturing costs (plant, labor, transportation, and other) 0 0 0 0
Segment gross margin 53,790 60,196 168,966 183,705
Employment related expenses 15,012 15,348 45,448 44,885
Driver pay 11,305 12,393 34,891 38,260
Pass-through expenses 5,650 5,218 17,632 18,896
Utilities, materials, and supplies 656 560 1,851 1,678
Repairs and maintenance 4,618 4,451 13,594 13,951
Insurance related expenses 4,489 3,808 12,734 11,243
Lease expenses 5,424 4,298 14,979 11,916
Other segment expenses 1,324 2,485 6,031 6,883
Depreciation and amortization 2,907 3,182 8,755 10,039
(Gain) loss on sale or disposition of property, plant and equipment (383) (130) (1,460) (496)
Operating expenses 51,002 51,613 154,455 157,255
Operating income 2,788 8,583 14,511 26,450
Segment assets - as of September 30, 2024 159,937 166,448 159,937 166,448
Capital expenditures and plant turnaround costs 2,217 1,929 7,116 6,554
Transportation segment | Elimination of intersegment revenues        
Segment Reporting Information        
Total consolidated revenues (4,081) (3,690) (12,446) (11,216)
Sulfur services segment        
Segment Reporting Information        
Total consolidated revenues 32,635 24,660 125,467 95,533
Sulfur services segment | Operating Segments        
Segment Reporting Information        
Total consolidated revenues 32,635 24,660 125,467 95,534
Direct product costs 16,878 8,302 66,302 43,482
Manufacturing costs (plant, labor, transportation, and other) 7,237 6,990 19,126 16,764
Segment gross margin 8,520 9,368 40,039 35,288
Employment related expenses 2,105 2,654 6,489 6,736
Driver pay 0 0 0 0
Pass-through expenses 815 863 2,456 2,192
Utilities, materials, and supplies 235 183 726 578
Repairs and maintenance 118 139 541 354
Insurance related expenses 195 132 535 427
Lease expenses 117 101 351 302
Other segment expenses 1,211 1,108 4,420 3,295
Depreciation and amortization 3,531 2,937 10,644 8,697
(Gain) loss on sale or disposition of property, plant and equipment (2) (3) (3) 305
Operating expenses 8,325 8,114 26,159 22,886
Operating income 195 1,254 13,880 12,402
Segment assets - as of September 30, 2024 127,554 116,748 127,554 116,748
Capital expenditures and plant turnaround costs 5,496 7,929 8,824 22,826
Sulfur services segment | Elimination of intersegment revenues        
Segment Reporting Information        
Total consolidated revenues 0 0 0 (1)
Specialty Products        
Segment Reporting Information        
Total consolidated revenues 62,443 67,206 192,066 200,819
Specialty Products | Operating Segments        
Segment Reporting Information        
Total consolidated revenues 62,482 67,225 192,151 200,888
Direct product costs 52,534 55,689 160,379 164,641
Manufacturing costs (plant, labor, transportation, and other) 4,318 4,756 13,684 15,159
Segment gross margin 5,630 6,780 18,088 21,088
Employment related expenses 1,344 1,790 4,228 4,328
Driver pay 0 0 0 0
Pass-through expenses 0 0 0 0
Utilities, materials, and supplies 29 48 88 111
Repairs and maintenance 1 7 10 16
Insurance related expenses 45 35 122 91
Lease expenses 20 28 73 94
Other segment expenses 248 257 736 741
Depreciation and amortization 755 794 2,268 2,389
(Gain) loss on sale or disposition of property, plant and equipment (13) (60) (17) (66)
Operating expenses 2,429 2,899 7,508 7,704
Operating income 3,201 3,881 10,580 13,384
Segment assets - as of September 30, 2024 66,755 79,503 66,755 79,503
Capital expenditures and plant turnaround costs 523 484 1,072 2,434
Specialty Products | Elimination of intersegment revenues        
Segment Reporting Information        
Total consolidated revenues $ (39) $ (19) $ (85) $ (69)