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SEGMENT REPORTING - Schedule of Operating Results by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Revenues	$ 181,194	$ 164,288
Operating Segments
Segment Reporting Information [Line Items]
Revenues	181,194	164,353
Elimination of intersegment revenues
Segment Reporting Information [Line Items]
Revenues	0	(65)
B&W Renewable segment | Operating Segments
Segment Reporting Information [Line Items]
Revenues	28,541	27,458
B&W Renewable segment | Operating Segments | Parts
Segment Reporting Information [Line Items]
Revenues	20,592	18,367
B&W Renewable segment | Operating Segments | Projects
Segment Reporting Information [Line Items]
Revenues	6,058	5,982
B&W Renewable segment | Operating Segments | Construction
Segment Reporting Information [Line Items]
Revenues	1,891	3,109
B&W Environmental segment | Operating Segments
Segment Reporting Information [Line Items]
Revenues	14,407	26,708
B&W Environmental segment | Operating Segments | Parts
Segment Reporting Information [Line Items]
Revenues	7,010	7,157
B&W Environmental segment | Operating Segments | Projects
Segment Reporting Information [Line Items]
Revenues	7,397	19,551
B&W Thermal segment | Operating Segments
Segment Reporting Information [Line Items]
Revenues	138,246	110,187
B&W Thermal segment | Operating Segments | Parts
Segment Reporting Information [Line Items]
Revenues	64,915	53,643
B&W Thermal segment | Operating Segments | Projects
Segment Reporting Information [Line Items]
Revenues	32,116	22,794
B&W Thermal segment | Operating Segments | Construction
Segment Reporting Information [Line Items]
Revenues	$ 41,215	$ 33,750

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