Revenue (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($) segment
Disaggregation of Revenue [Line Items]
Contract revenues	$ 748,322	$ 601,360	$ 709,942
Number of reportable segments | segment	2	2	2
Marine Segment
Disaggregation of Revenue [Line Items]
Contract revenues	$ 339,213	$ 263,915	$ 388,173
Marine Segment | Construction
Disaggregation of Revenue [Line Items]
Contract revenues	239,656	169,554	272,870
Marine Segment | Dredging
Disaggregation of Revenue [Line Items]
Contract revenues	85,414	80,831	106,647
Marine Segment | Specialty Services
Disaggregation of Revenue [Line Items]
Contract revenues	14,143	13,530	8,656
Concrete Segment
Disaggregation of Revenue [Line Items]
Contract revenues	409,109	337,445	321,769
Concrete Segment | Structural
Disaggregation of Revenue [Line Items]
Contract revenues	57,425	58,420	85,904
Concrete Segment | Light Commercial
Disaggregation of Revenue [Line Items]
Contract revenues	$ 351,684	279,018	235,835
Concrete Segment | Other
Disaggregation of Revenue [Line Items]
Contract revenues		$ 7	$ 30