Segment Information - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) segment	Sep. 30, 2024 USD ($) segment	Sep. 30, 2025 USD ($) segment	Sep. 30, 2024 USD ($) segment
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2	2	2	2
Contract revenues	$ 225,097	$ 226,675	$ 619,037	$ 579,514
Marine
Segment Reporting Information [Line Items]
Contract revenues	142,943	140,013	405,409	377,291
Concrete
Segment Reporting Information [Line Items]
Contract revenues	82,154	86,662	213,628	202,223
Operating Segments | Marine
Segment Reporting Information [Line Items]
Contract revenues	142,943	140,013	405,409	377,291
Operating Segments | Concrete
Segment Reporting Information [Line Items]
Contract revenues	82,154	86,662	213,628	202,223
Intersegment Eliminations
Segment Reporting Information [Line Items]
Contract revenues	$ 1,200	$ 100	$ 2,800	$ 1,800