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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in Carrying Amount of Goodwill | The following table summarizes the carrying amount and changes in goodwill associated with the Company's segments for the years ended December 31, 2025 and 2024.
(in thousands) | GCR |  | ODR |  | Total
Goodwill as of January 1, 2024 | $ | — |  |  | $ | 16,374 |  |  | $ | 16,374 |
Measurement period adjustments - Industrial Air Transaction(1) | — |  |  | 59 |  |  | 59 |
Goodwill associated with the Kent Island Transaction(2) | 4,244 |  |  | 1,240 |  |  | 5,484 |
Goodwill associated with the Consolidated Mechanical Transaction | — |  |  | 11,117 |  |  | 11,117 |
Goodwill as of December 31, 2024 | $ | 4,244 |  |  | $ | 28,790 |  |  | $ | 33,034 |
Measurement period adjustments - Kent Island Transaction(2) | 94 |  |  | — |  |  | 94 |
Measurement period adjustments - Consolidated Mechanical Transaction(3) | — |  |  | 3 |  |  | 3 |
Goodwill associated with the Pioneer Power Transaction | 10,984 |  |  | 25,630 |  |  | 36,614 |
Measurement period adjustments - Pioneer Power Transaction(4) | 256 |  |  | 599 |  |  | 855 |
Goodwill as of December 31, 2025 | $ | 15,578 |  |  | $ | 55,022 |  |  | $ | 70,600 |
(1) Includes certain adjustments to preliminary estimates of fair value within the measurement period of up to one-year from the date of the Industrial Air transaction. Measurement period adjustments related to certain working capital adjustments. (2) In connection with the Kent Island Transaction, the Company recorded preliminary goodwill of $4.8 million. During the fourth quarter of 2024, the Company recognized certain adjustments to preliminary estimates of fair value within the measurement period of up to one-year from the date of the Kent Island Transaction. The measurement period adjustments amounted to $0.7 million and related to certain working capital adjustments made in connection with the finalization of the transaction’s closing date cash consideration. In addition, during the first quarter of 2025, the Company recognized further adjustments to the preliminary estimates of fair value within the measurement period of $0.1 million related to the receipt of additional information regarding the facts and circumstances that existed as of the acquisition date. (3) During the first half of 2025, the Company recognized certain adjustments to the preliminary estimates of fair value within the measurement period amounting to less than $0.1 million associated with certain working capital adjustments made in connection with the finalization of the transaction’s closing date cash consideration. (4) Measurement period adjustments recorded during the quarter ended December 31, 2025 reflect changes to the fair value of contract assets acquired and contract liabilities assumed, resulting in a net increase of approximately $0.9 million to goodwill.
Schedule of Definite-Lived and Indefinite-Lived Intangible Assets | Definite-lived and indefinite-lived intangible assets consist of the following:
(in thousands) | Gross carrying amount |  | Accumulated amortization |  | Net intangible assets, excluding goodwill
December 31, 2025 |  |  |  |  |
Amortized intangible assets: |  |  |  |  |
Customer relationships | $ | 47,620 |  |  | $ | (11,741) |  |  | $ | 35,879 |
Backlog | 5,960 |  |  | (5,800) |  |  | 160 |
Trade name, trademarks and intellectual property | 5,550 |  |  | (2,362) |  |  | 3,188 |
Total amortized intangible assets | 59,130 |  |  | (19,903) |  |  | 39,227 |
Unamortized intangible assets: |  |  |  |  |
Trade name – Limbach(1) | 9,960 |  |  | — |  |  | 9,960 |
Total unamortized intangible assets | 9,960 |  |  | — |  |  | 9,960 |
Total amortized and unamortized assets, excluding goodwill | $ | 69,090 |  |  | $ | (19,903) |  |  | $ | 49,187 |
(1) The Company has determined that its trade name has an indefinite useful life. The Limbach trade name has been in existence since the Company’s founding in 1901 and therefore is an established brand within the industry.
(in thousands) | Gross carrying amount |  | Accumulated amortization |  | Net intangible assets, excluding goodwill
December 31, 2024 |  |  |  |  |
Amortized intangible assets: |  |  |  |  |
Customer relationships | $ | 32,820 |  |  | $ | (7,124) |  |  | $ | 25,696 |
Backlog | 5,560 |  |  | (3,310) |  |  | 2,250 |
Trade name, trademarks and intellectual property | 4,550 |  |  | (1,228) |  |  | 3,322 |
Total amortized intangible assets | 42,930 |  |  | (11,662) |  |  | 31,268 |
Unamortized intangible assets: |  |  |  |  |
Trade name – Limbach | 9,960 |  |  | — |  |  | 9,960 |
Total unamortized intangible assets | 9,960 |  |  | — |  |  | 9,960 |
Total amortized and unamortized assets, excluding goodwill | $ | 52,890 |  |  | $ | (11,662) |  |  | $ | 41,228 |
Schedule of Estimated Remaining Useful Lives of Definite-lived Intangible Assets | The estimated remaining useful lives of definite-lived intangible assets are as follows:
Intangible Asset |  | Amortization Method |  | Weighted Average Remaining Useful Life (Years)
Customer relationships |  | Straight line / Pattern of economic benefit |  | 7.3
Trade name, trademarks and intellectual property |  | Straight line |  | 4.1
Backlog |  | Straight line |  | 0.3
Schedule of Estimated Amortization Expense | Estimated amortization expense is as follows for the years ending December 31:
(in thousands) |  | Estimated Amortization Expense
2026 |  | $ | 6,661 |
2027 |  | 5,923 |
2028 |  | 5,693 |
2029 |  | 5,352 |
2030 |  | 5,148 |
2031 and thereafter |  | 10,450 |
Total |  | $ | 39,227 |

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