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

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details
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