Revenue - Schedule of Type of customer (Details) $ in Thousands		3 Months Ended
	Mar. 10, 2023 USD ($)	Mar. 31, 2026 USD ($) customer	Mar. 31, 2025 USD ($)
Disaggregation of Revenue [Line Items]
Contract revenues		$ 216,301	$ 188,653
Dragados/Hawaiian Dredging/Orion Joint Venture
Disaggregation of Revenue [Line Items]
Contract revenues		14,300	33,300
Contract awarded	$ 467,800
Contract revenues
Disaggregation of Revenue [Line Items]
Contract revenues		216,301	188,653
Federal Government
Disaggregation of Revenue [Line Items]
Contract revenues		29,726	41,884
State Governments
Disaggregation of Revenue [Line Items]
Contract revenues		35,658	28,961
Local Governments
Disaggregation of Revenue [Line Items]
Contract revenues		27,620	37,037
Private Companies
Disaggregation of Revenue [Line Items]
Contract revenues		$ 123,297	$ 80,771
Customer concentration risk | Contract revenues
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage		100.00%	100.00%
Number of customers exceeding the 10% benchmark percentage | customer		0
Customer concentration risk | Federal Government | Contract revenues
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage		14.00%	22.00%
Customer concentration risk | Federal Government | Contract revenues | US Navy
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage			18.00%
Customer concentration risk | State Governments | Contract revenues
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage		16.00%	15.00%
Customer concentration risk | Local Governments | Contract revenues
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage		13.00%	20.00%
Customer concentration risk | Private Companies | Contract revenues
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage		57.00%	43.00%
Geographic concentration | Contract revenues | Foreign
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage		2.00%	6.00%