Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Revenue (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
Revenue (Details) $ in Thousands	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) segment	Jun. 30, 2025 USD ($)	Dec. 31, 2025 segment
Disaggregation of Revenue [Line Items]
Contract revenues	$ 221,878	$ 205,286	$ 438,179	$ 393,939
Number of reportable segments \| segment			2		2
Marine
Disaggregation of Revenue [Line Items]
Contract revenues	130,843	135,302	$ 240,972	262,465
Marine \| Construction
Disaggregation of Revenue [Line Items]
Contract revenues	109,881	114,830	202,564	219,312
Marine \| Dredging
Disaggregation of Revenue [Line Items]
Contract revenues	16,630	17,700	30,711	34,611
Marine \| Specialty Services
Disaggregation of Revenue [Line Items]
Contract revenues	4,332	2,772	7,697	8,542
Concrete
Disaggregation of Revenue [Line Items]
Contract revenues	91,035	69,984	197,207	131,474
Concrete \| Structural
Disaggregation of Revenue [Line Items]
Contract revenues	6,673	12,582	16,426	26,303
Concrete \| Light Commercial
Disaggregation of Revenue [Line Items]
Contract revenues	$ 84,362	$ 57,402	$ 180,781	$ 105,171