Revenue (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($) segment
Disaggregation of Revenue [Line Items]
Contract revenues	$ 711,778	$ 748,322	$ 601,360
Number of reportable segments | segment	2	2	2
Marine Segment
Disaggregation of Revenue [Line Items]
Contract revenues	$ 395,917	$ 339,213	$ 263,915
Marine Segment | Construction
Disaggregation of Revenue [Line Items]
Contract revenues	297,462	239,656	169,554
Marine Segment | Dredging
Disaggregation of Revenue [Line Items]
Contract revenues	60,667	85,414	80,831
Marine Segment | Specialty Services
Disaggregation of Revenue [Line Items]
Contract revenues	37,788	14,143	13,530
Concrete Segment
Disaggregation of Revenue [Line Items]
Contract revenues	315,861	409,109	337,445
Concrete Segment | Structural
Disaggregation of Revenue [Line Items]
Contract revenues	53,827	57,425	58,420
Concrete Segment | Light Commercial
Disaggregation of Revenue [Line Items]
Contract revenues	$ 262,034	$ 351,684	279,018
Concrete Segment | Other
Disaggregation of Revenue [Line Items]
Contract revenues			$ 7