Business Combinations - Narrative (Details) shares in Millions					1 Months Ended	5 Months Ended	7 Months Ended	12 Months Ended
	Aug. 04, 2025 USD ($) shares	May 14, 2025 USD ($)	Jul. 30, 2024 USD ($)	Jul. 29, 2024 USD ($)	Jul. 29, 2024 USD ($)	Dec. 31, 2024 USD ($)	Jul. 29, 2024 USD ($) business	Dec. 31, 2025 USD ($) business	Dec. 31, 2023 USD ($) business
Business Combination, Separately Recognized Transaction [Line Items]
Equity consideration issued for business combinations						$ 4,000,000		$ 798,048,000
Goodwill			$ 0			845,939,000		1,649,595,000
Transaction costs						35,998,000		25,628,000
Predecessor
Business Combination, Separately Recognized Transaction [Line Items]
Equity consideration issued for business combinations							$ 0		$ 0
Goodwill				$ 525,599,000	$ 525,599,000		525,599,000		511,501,000
Transaction costs					5,204,000				0
Acuren British Virgin Islands | Acuren British Virgin Islands
Business Combination, Separately Recognized Transaction [Line Items]
Fair value of investment by Acuren BVI			4,000,000.0
Inspection and Mitigation
Business Combination, Separately Recognized Transaction [Line Items]
Goodwill			0			845,939,000		895,533,000
Inspection and Mitigation | Predecessor
Business Combination, Separately Recognized Transaction [Line Items]
Goodwill				525,599,000	525,599,000		525,599,000		511,501,000
Consulting Engineering
Business Combination, Separately Recognized Transaction [Line Items]
Goodwill			0			0		516,873,000
Consulting Engineering | Predecessor
Business Combination, Separately Recognized Transaction [Line Items]
Goodwill				0	0		0		0
Geospatial
Business Combination, Separately Recognized Transaction [Line Items]
Goodwill			0			0		237,189,000
Geospatial | Predecessor
Business Combination, Separately Recognized Transaction [Line Items]
Goodwill				0	0		0		0
NV5 Global, Inc.
Business Combination, Separately Recognized Transaction [Line Items]
Consideration	$ 1,668,959,000
Cash paid to acquire business	$ 870,911,000
Number of shares issued (in shares) | shares	73.2
Equity consideration issued for business combinations	$ 768,304,000
Replacement of unvested	76,500,000
Replacement of share-based awards	29,744,000
Debt issuance costs	21,900,000
Goodwill	763,514,000
Goodwill expected to be tax deductible	76,100,000
Measurement period adjustments								75,300,000
Identifiable intangible assets								(101,900,000)
Deferred tax liability								30,900,000
Transaction costs	$ 24,700,000
Revenue for the period								431,400,000
Income before income tax provision								3,200,000
NV5 Global, Inc. | Customer relationships
Business Combination, Separately Recognized Transaction [Line Items]
Weighted average remaining life (in years)	15 years
NV5 Global, Inc. | Customer backlog
Business Combination, Separately Recognized Transaction [Line Items]
Weighted average remaining life (in years)	2 years
NV5 Global, Inc. | Trade name
Business Combination, Separately Recognized Transaction [Line Items]
Weighted average remaining life (in years)	10 years
NV5 Global, Inc. | Developed technology
Business Combination, Separately Recognized Transaction [Line Items]
Weighted average remaining life (in years)	3 years
NV5 Global, Inc. | Inspection and Mitigation
Business Combination, Separately Recognized Transaction [Line Items]
Goodwill	$ 15,400,000
NV5 Global, Inc. | Consulting Engineering
Business Combination, Separately Recognized Transaction [Line Items]
Goodwill	515,000,000.0
NV5 Global, Inc. | Geospatial
Business Combination, Separately Recognized Transaction [Line Items]
Goodwill	233,100,000
NV5 Global, Inc. | Revolving Credit Facility
Business Combination, Separately Recognized Transaction [Line Items]
Debt issuance costs	1,300,000
Increase in existing senior secured revolving credit facility	125,000,000.0
NV5 Global, Inc. | Revolving Credit Facility | Line of Credit
Business Combination, Separately Recognized Transaction [Line Items]
Long-term debt	$ 875,000,000.0
2025 Business Acquisitions
Business Combination, Separately Recognized Transaction [Line Items]
Cash paid to acquire business								43,600,000
Goodwill								$ 15,700,000
Number of businesses acquired | business								7
2025 Business Acquisitions | Inspection and Mitigation
Business Combination, Separately Recognized Transaction [Line Items]
Goodwill								$ 9,700,000
2025 Business Acquisitions | Consulting Engineering
Business Combination, Separately Recognized Transaction [Line Items]
Goodwill								1,900,000
2025 Business Acquisitions | Geospatial
Business Combination, Separately Recognized Transaction [Line Items]
Goodwill								$ 4,100,000
ASP Acuren Acquisition
Business Combination, Separately Recognized Transaction [Line Items]
Consideration			1,875,642,000
Cash paid to acquire business			1,871,642,000
Equity consideration issued for business combinations			4,000,000
Goodwill			865,599,000
Transaction costs		$ 14,000,000.0		5,200,000
Incurred costs						36,000,000.0
Contingent consideration				40,400,000	40,400,000	11,600,000	40,400,000
Contingent liability				$ 0	$ 0		0
Post-closing escrow amount returned to buyers			5,200,000
Measurement period net working capital adjustment and settlement			400,000
ASP Acuren Acquisition | Customer relationships
Business Combination, Separately Recognized Transaction [Line Items]
Weighted average remaining life (in years)		15 years
ASP Acuren Acquisition | Developed technology
Business Combination, Separately Recognized Transaction [Line Items]
Weighted average remaining life (in years)		5 years
ASP Acuren Acquisition | Trade names and trademarks
Business Combination, Separately Recognized Transaction [Line Items]
Weighted average remaining life (in years)		15 years
ASP Acuren Acquisition | Inspection and Mitigation
Business Combination, Separately Recognized Transaction [Line Items]
Goodwill			$ 865,600,000
Three Company | Predecessor
Business Combination, Separately Recognized Transaction [Line Items]
Cash paid to acquire business							$ 47,600,000
Goodwill						$ 22,200,000
Number of businesses acquired | business							3
Revenue for the period							$ 9,800,000
2023 Business Acquisitions | Predecessor
Business Combination, Separately Recognized Transaction [Line Items]
Cash paid to acquire business									6,000,000.0
Goodwill									$ 2,600,000
Number of businesses acquired | business									1