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Acquisitions - Narrative (Details) $ in Thousands |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2025 USD ($) | Dec. 02, 2024 USD ($) payment | Sep. 03, 2024 USD ($) payment | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2025 | Dec. 31, 2023 USD ($)
Business Combination [Line Items] |  |  |  |  |  |  |
Estimated annual amortization expense year one |  |  |  | $ 6,661 |  |  |
Estimated annual amortization expense year two |  |  |  | 5,923 |  |  |
Estimated annual amortization expense year four |  |  |  | 5,352 |  |  |
Business combination, acquiree's revenue |  |  |  | 109,100 |  |  |
Pioneer Power Inc. |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Business combination, ownership percentage through employee stock ownership plan |  |  |  |  |  | 100.00% |
Consideration paid at closing | $ 66,100 |  |  |  |  |  |
Amount of consideration paid held in escrow for indemnification purposes | 4,100 |  |  |  |  |  |
Goodwill, acquired during period |  |  |  | 36,614 |  |  |
Business combination, recognized asset acquired, property, plant, and equipment, equipment |  |  |  | 6,300 |  |  |
Estimated annual amortization expense year one |  |  |  | 2,300 |  |  |
Estimated annual amortization expense year two |  |  |  | 1,600 |  |  |
Estimated annual amortization expense year four |  |  |  | 1,500 | $ 1,500 |  | $ 1,500
Acquisition related expense |  |  |  | 200 |  |  |
Pioneer Power Inc. | Owner Direct Relationships and General Contractor (Construction Manager) Relationships Segment |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Goodwill, acquired during period | 37,500 |  |  |  |  |  |
Goodwill fully deductible for tax purposes | $ 37,500 |  |  |  |  |  |
Consolidated Mechanical |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Consideration paid at closing |  | $ 23,000 |  |  |  |  |
Amount of consideration paid held in escrow for indemnification purposes |  | 300 |  |  |  |  |
Goodwill, acquired during period |  |  |  |  | 11,117 |  |
Earnout payments |  | $ 2,000 |  | 800 |  |  |
Number of earnout tranches | payment |  | 2 |  |  |  |  |
Consolidated Mechanical | First Consolidated Mechanical Earnout Period |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Earnout payments |  | $ 1,000 |  |  |  |  |
Earnout period (in months) |  | 12 months |  |  |  |  |
Consolidated Mechanical | First Consolidated Mechanical Earnout Period | Maximum |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Gross profits from acquired companies |  | $ 6,800 |  |  |  |  |
Consolidated Mechanical | Second Consolidated Mechanical Earnout Period |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Earnout period (in months) |  | 12 months |  |  |  |  |
Consolidated Mechanical | Second Consolidated Mechanical Earnout Period | Maximum |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Gross profits from acquired companies |  | $ 6,800 |  |  |  |  |
Consolidated Mechanical | Owner Direct Relationships and General Contractor (Construction Manager) Relationships Segment |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Goodwill, acquired during period |  | 11,100 |  |  |  |  |
Goodwill fully deductible for tax purposes |  | $ 11,100 |  |  |  |  |
Kent Island |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Consideration paid at closing |  |  | $ 15,000 |  |  |  |
Amount of consideration paid held in escrow for indemnification purposes |  |  | 400 |  |  |  |
Goodwill, acquired during period |  |  |  |  | $ 5,484 |  |
Earnout payments |  |  | $ 5,000 | $ 4,400 |  |  |
Number of earnout tranches | payment |  |  | 2 |  |  |  |
Kent Island | First Kent Island Earnout Period |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Earnout payments |  |  | $ 2,500 |  |  |  |
Earnout period (in months) |  |  | 12 months |  |  |  |
Kent Island | First Kent Island Earnout Period | Maximum |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Gross profits from acquired companies |  |  | $ 3,300 |  |  |  |
Kent Island | Second Kent Island Earnout Period |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Earnout payments |  |  | $ 2,500 |  |  |  |
Earnout period (in months) |  |  | 12 months |  |  |  |
Kent Island | Second Kent Island Earnout Period | Maximum |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Gross profits from acquired companies |  |  | $ 200 |  |  |  |
Kent Island | Owner Direct Relationships and General Contractor (Construction Manager) Relationships Segment |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |
Goodwill, acquired during period |  |  | 5,600 |  |  |  |
Goodwill fully deductible for tax purposes |  |  | $ 5,600 |  |  |  |

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