Acquisitions - Narrative (Details) $ in Thousands			3 Months Ended			6 Months Ended	9 Months Ended	10 Months Ended	12 Months Ended	13 Months Ended
	Jul. 01, 2025 USD ($) payment	Sep. 03, 2024 USD ($) payment	Sep. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2025 USD ($)
Business Combination [Line Items]
Measurement period adjustments, goodwill						$ 100
Business combination, acquiree's revenue			$ 47,300				$ 76,100
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 fully deductible for tax purposes									$ 36,614
Business combination, recognized asset acquired, property, plant, and equipment, equipment			6,300				6,300	$ 6,300		$ 6,300
Remainder of fiscal year			700				700	700		700
Estimated annual amortization expense year one			2,300				2,300	2,300		2,300
Estimated annual amortization expense year two			1,600				1,600	1,600		1,600
Estimated annual amortization expense year three			1,500				1,500	1,500		1,500
Estimated annual amortization expense year four			1,500				1,500	1,500		1,500
Estimated annual amortization expense year five			1,500				1,500	1,500		1,500
Acquisition related expense			$ 300				300
Pioneer Power Inc. | ODR & GCR
Business Combination [Line Items]
Goodwill fully deductible for tax purposes	36,600
Goodwill associated with acquisition	36,600
Consolidated Mechanical
Business Combination [Line Items]
Consideration paid at closing	23,000
Amount of consideration paid held in escrow for indemnification purposes	300
Goodwill fully deductible for tax purposes									11,117
Contingent consideration, liability	$ 2,000
Number of earnout tranches | payment	2
Measurement period adjustments, goodwill						$ 100	3	$ 3
Consolidated Mechanical | ODR & GCR
Business Combination [Line Items]
Goodwill fully deductible for tax purposes	$ 11,100
Goodwill associated with acquisition	11,100
Consolidated Mechanical | Earn Out Payment One
Business Combination [Line Items]
Contingent consideration, liability	1,000
Consolidated Mechanical | Earn Out Payment Two
Business Combination [Line Items]
Contingent consideration, liability	$ 1,000
Earnout period	12 months
Consolidated Mechanical | Earn Out Payment Two | Maximum
Business Combination [Line Items]
Gross profits from acquired companies	$ 6,800
Kent Island Mechanical, Inc.
Business Combination [Line Items]
Consideration paid at closing		$ 15,000
Amount of consideration paid held in escrow for indemnification purposes		400
Goodwill fully deductible for tax purposes									5,484
Contingent consideration, liability		$ 4,400
Number of earnout tranches | payment		2
Measurement period adjustments, goodwill				$ 100	$ 700		$ 94		$ 700	$ 765
Kent Island Mechanical, Inc. | ODR & GCR
Business Combination [Line Items]
Goodwill fully deductible for tax purposes		$ 5,600
Goodwill associated with acquisition		5,600
Kent Island Mechanical, Inc. | Maximum
Business Combination [Line Items]
Contingent consideration, liability		5,000
Kent Island Mechanical, Inc. | Earn Out Payment One
Business Combination [Line Items]
Contingent consideration, liability		$ 2,500
Earnout period		12 months
Kent Island Mechanical, Inc. | Earn Out Payment One | Maximum
Business Combination [Line Items]
Gross profits from acquired companies		$ 3,300
Kent Island Mechanical, Inc. | Earn Out Payment Two
Business Combination [Line Items]
Contingent consideration, liability		$ 2,500
Earnout period		12 months
Kent Island Mechanical, Inc. | Earn Out Payment Two | Maximum
Business Combination [Line Items]
Gross profits from acquired companies		$ 200