Segment Reporting - Summary of Service Revenues Classifications by Major Geographic Areas (Details) - USD ($) $ in Thousands	1 Months Ended	5 Months Ended	7 Months Ended	12 Months Ended
	Jul. 29, 2024	Dec. 31, 2024	Jul. 29, 2024	Dec. 31, 2025	Dec. 31, 2023
Segment Reporting Information [Line Items]
Revenue		$ 463,527	$ 633,866	$ 1,530,296	$ 1,050,057
Predecessor
Segment Reporting Information [Line Items]
Revenue	$ 633,866				1,050,057
Inspection and Mitigation | Predecessor
Segment Reporting Information [Line Items]
Revenue					1,050,057
Consulting Engineering | Predecessor
Segment Reporting Information [Line Items]
Revenue					0
Geospatial | Predecessor
Segment Reporting Information [Line Items]
Revenue					0
Operating Segments
Segment Reporting Information [Line Items]
Revenue		463,527		1,530,296
Operating Segments | Predecessor
Segment Reporting Information [Line Items]
Revenue	633,866		633,866		1,050,057
Operating Segments | Inspection and Mitigation
Segment Reporting Information [Line Items]
Revenue		463,527	633,866	1,098,888	1,050,057
Operating Segments | Inspection and Mitigation | Predecessor
Segment Reporting Information [Line Items]
Revenue	633,866		633,866		1,050,057
Operating Segments | Consulting Engineering
Segment Reporting Information [Line Items]
Revenue		0	0	300,145	0
Operating Segments | Consulting Engineering | Predecessor
Segment Reporting Information [Line Items]
Revenue	0		0		0
Operating Segments | Geospatial
Segment Reporting Information [Line Items]
Revenue		0	0	131,263	0
Operating Segments | Geospatial | Predecessor
Segment Reporting Information [Line Items]
Revenue	0		$ 0		0
Operating Segments | United States
Segment Reporting Information [Line Items]
Revenue		266,831		984,029
Operating Segments | United States | Predecessor
Segment Reporting Information [Line Items]
Revenue	363,119				643,492
Operating Segments | United States | Inspection and Mitigation
Segment Reporting Information [Line Items]
Revenue		266,831		601,105
Operating Segments | United States | Inspection and Mitigation | Predecessor
Segment Reporting Information [Line Items]
Revenue	363,119				643,492
Operating Segments | United States | Consulting Engineering
Segment Reporting Information [Line Items]
Revenue		0		260,270
Operating Segments | United States | Consulting Engineering | Predecessor
Segment Reporting Information [Line Items]
Revenue	0				0
Operating Segments | United States | Geospatial
Segment Reporting Information [Line Items]
Revenue		0		122,654
Operating Segments | United States | Geospatial | Predecessor
Segment Reporting Information [Line Items]
Revenue	0				0
Operating Segments | Canada
Segment Reporting Information [Line Items]
Revenue		196,696		488,132
Operating Segments | Canada | Predecessor
Segment Reporting Information [Line Items]
Revenue	270,747				406,565
Operating Segments | Canada | Inspection and Mitigation
Segment Reporting Information [Line Items]
Revenue		196,696		487,283
Operating Segments | Canada | Inspection and Mitigation | Predecessor
Segment Reporting Information [Line Items]
Revenue	270,747				406,565
Operating Segments | Canada | Consulting Engineering
Segment Reporting Information [Line Items]
Revenue		0		0
Operating Segments | Canada | Consulting Engineering | Predecessor
Segment Reporting Information [Line Items]
Revenue	0				0
Operating Segments | Canada | Geospatial
Segment Reporting Information [Line Items]
Revenue		0		849
Operating Segments | Canada | Geospatial | Predecessor
Segment Reporting Information [Line Items]
Revenue	0				0
Operating Segments | Other foreign
Segment Reporting Information [Line Items]
Revenue		0		58,135
Operating Segments | Other foreign | Predecessor
Segment Reporting Information [Line Items]
Revenue	0				0
Operating Segments | Other foreign | Inspection and Mitigation
Segment Reporting Information [Line Items]
Revenue		0		10,500
Operating Segments | Other foreign | Inspection and Mitigation | Predecessor
Segment Reporting Information [Line Items]
Revenue	0				0
Operating Segments | Other foreign | Consulting Engineering
Segment Reporting Information [Line Items]
Revenue		0		39,875
Operating Segments | Other foreign | Consulting Engineering | Predecessor
Segment Reporting Information [Line Items]
Revenue	0				0
Operating Segments | Other foreign | Geospatial
Segment Reporting Information [Line Items]
Revenue		$ 0		$ 7,760
Operating Segments | Other foreign | Geospatial | Predecessor
Segment Reporting Information [Line Items]
Revenue	$ 0				$ 0