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BUSINESS COMBINATIONS | 9 Months Ended
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Sep. 30, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] |
BUSINESS COMBINATIONS | BUSINESS COMBINATIONS 2024 Acquisitions On March 22, 2024, the Company acquired HEPACO for an all-cash purchase price of $392.2 million, net of cash acquired. The acquisition of HEPACO expanded the Environmental Services segment’s Field Services business. The Company finalized the purchase accounting for this acquisition in the first quarter of 2025. The allocation of the purchase price was based on estimates of the fair value of assets acquired and liabilities assumed as of March 22, 2024. The following table summarizes the preliminary and final determinations and recognition of assets acquired and liabilities assumed (in thousands):
| At Acquisition Date As Reported December 31, 2024 |  | Measurement Period Adjustments |  | Final Allocation At Acquisition Date
Accounts receivable, including unbilled receivables | $ | 69,072 |  |  | $ | (856) |  |  | $ | 68,216 |
Inventories and supplies | 384 |  |  | — |  |  | 384 |
Prepaid expenses and other current assets | 4,383 |  |  | (123) |  |  | 4,260 |
Property, plant and equipment | 47,125 |  |  | 385 |  |  | 47,510 |
Permits and other intangibles | 130,500 |  |  | — |  |  | 130,500 |
Operating lease right-of-use assets | 9,385 |  |  | — |  |  | 9,385 |
Other long-term assets | 5,712 |  |  | 1,133 |  |  | 6,845 |
Accounts payable | (30,602) |  |  | — |  |  | (30,602) |
Accrued expenses and other current liabilities | (16,005) |  |  | (300) |  |  | (16,305) |
Current portion of operating lease liabilities | (2,758) |  |  | — |  |  | (2,758) |
Operating lease liabilities, less current portion | (6,627) |  |  | — |  |  | (6,627) |
Closure and post-closure liabilities | (2,492) |  |  | (385) |  |  | (2,877) |
Remedial liabilities | (2,435) |  |  | — |  |  | (2,435) |
Other long-term liabilities | (374) |  |  | — |  |  | (374) |
Total identifiable net assets | 205,268 |  |  | (146) |  |  | 205,122 |
Goodwill | 186,911 |  |  | 146 |  |  | 187,057 |
Total purchase price | $ | 392,179 |  |  | $ | — |  |  | $ | 392,179 |
Other intangible assets acquired include customer relationships and trademarks/tradenames and are anticipated to have estimated useful lives of between seven and 20 years with a weighted average useful life of approximately 19 years. The Company recorded the excess of the total purchase price, which includes the aggregate cash consideration paid in excess of the fair value of the tangible and intangible assets acquired and liabilities assumed, as goodwill. The goodwill recognized is attributable to the operating synergies, assembled workforce and growth potential that the Company expects to realize from the acquisition. Goodwill generated from the acquisition is not deductible for tax purposes. The operations of HEPACO are included in the Company’s financial statements as of the date of acquisition. Pro forma revenue and earnings amounts on a combined basis as if this acquisition had been completed on January 1, 2024 are immaterial to the consolidated financial statements of the Company. On March 1, 2024, the Company acquired Noble Oil Services, Inc. and its subsidiaries (collectively, “Noble”) for an all-cash purchase price of $68.7 million, net of cash acquired. The acquisition of Noble expanded the SKSS segment’s oil collection operations in the southeastern region of the United States while also adding incremental production from the re-refinery owned and operated by the acquired company. The Company finalized the purchase accounting for this acquisition in the first quarter of 2025. The allocation of the purchase price was based on estimates of the fair value of assets acquired and liabilities assumed as of March 1, 2024. The following table summarizes the preliminary and final determinations and recognition of assets acquired and liabilities assumed (in thousands):
| At Acquisition Date As Reported December 31, 2024 |  | Measurement Period Adjustments |  | Final Allocation At Acquisition Date
Accounts receivable, including unbilled receivables | $ | 5,855 |  |  | $ | (8) |  |  | $ | 5,847 |
Inventories and supplies | 6,598 |  |  | — |  |  | 6,598 |
Prepaid expenses and other current assets | 408 |  |  | — |  |  | 408 |
Property, plant and equipment | 55,615 |  |  | 35 |  |  | 55,650 |
Permits and other intangibles | 14,500 |  |  | — |  |  | 14,500 |
Operating lease right-of-use assets | 3,615 |  |  | — |  |  | 3,615 |
Other long-term assets | 92 |  |  | — |  |  | 92 |
Accounts payable | (7,752) |  |  | — |  |  | (7,752) |
Accrued expenses and other current liabilities | (1,145) |  |  | 17 |  |  | (1,128) |
Current portion of operating lease liabilities | (1,823) |  |  | — |  |  | (1,823) |
Operating lease liabilities, less current portion | (1,792) |  |  | — |  |  | (1,792) |
Closure and post-closure liabilities | (8,929) |  |  | (35) |  |  | (8,964) |
Remedial liabilities | (2,757) |  |  | 90 |  |  | (2,667) |
Total identifiable net assets | 62,485 |  |  | 99 |  |  | 62,584 |
Goodwill | 6,257 |  |  | (99) |  |  | 6,158 |
Total purchase price | $ | 68,742 |  |  | $ | — |  |  | $ | 68,742 |
Other intangible assets acquired include customer relationships and trademarks/tradenames and are anticipated to have estimated useful lives of between seven and 15 years with a weighted average useful life of approximately 13 years. The Company recorded the excess of the total purchase price, which includes the aggregate cash consideration paid in excess of the fair value of the tangible and intangible assets acquired and liabilities assumed, as goodwill. The goodwill recognized is attributable to the operating synergies and assembled workforce that the Company expects to realize from the acquisition. Goodwill generated from the acquisition is deductible for tax purposes. The operations of Noble are included in the Company’s financial statements as of the date of acquisition. Pro forma revenue and earnings amounts on a combined basis as if this acquisition had been completed on January 1, 2024 are immaterial to the consolidated financial statements of the Company. During 2024, the Company completed the acquisition of three additional privately-owned businesses for $17.1 million in total cash consideration. The operations of the acquired businesses were consolidated into the Environmental Services and SKSS segments. The acquisitions of the acquired businesses were not material in 2024 to the consolidated financial statements of the Company.

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