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Revenue, Contract Assets and Liabilities and Other Contract Matters - Additional Information (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 USD ($) Vechicle | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Long Term Contracts Or Programs Disclosure [Line Items] |  |  |
Allowance for doubtful accounts and credit losses | $ 1,700 |  | $ 200
Increase to beginning accumulated deficit | (21,820) |  | $ (26,632)
ENGlobal Business |  |  |
Long Term Contracts Or Programs Disclosure [Line Items] |  |  |
Provision for bad debts and credit losses | $ 1,500 |  |
Hurricane Ida |  |  |
Long Term Contracts Or Programs Disclosure [Line Items] |  |  |
Insurance payments received |  | $ 2,000 |
Insurance payments received, investing activities |  | $ 300 |
Forty-Vehicle Ferry |  |  |
Long Term Contracts Or Programs Disclosure [Line Items] |  |  |
Number of vehicle ferry projects with rework and construction challenges. | Vechicle | 2 |  |

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