Revenue - Schedule of Type of customer (Details) - USD ($) $ in Thousands		12 Months Ended
	Mar. 10, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Contract revenues		$ 852,260	$ 796,394	$ 711,778
Dragados/Hawaiian Dredging/Orion Joint Venture
Disaggregation of Revenue [Line Items]
Contract revenues		121,500	199,400	90,500
Contract awarded	$ 463,900
Customer concentration risk | Contract revenues
Disaggregation of Revenue [Line Items]
Contract revenues		$ 852,260	$ 796,394	$ 711,778
Concentration Risk, Percentage		100.00%	100.00%	100.00%
Customer concentration risk | Federal Government | Contract revenues
Disaggregation of Revenue [Line Items]
Contract revenues		$ 162,992	$ 234,175	$ 153,410
Concentration Risk, Percentage		19.00%	30.00%	22.00%
Customer concentration risk | Federal Government | Contract revenues | US Navy
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage		14.00%	25.00%	13.00%
Customer concentration risk | State Governments | Contract revenues
Disaggregation of Revenue [Line Items]
Contract revenues		$ 116,304	$ 74,286	$ 59,354
Concentration Risk, Percentage		14.00%	9.00%	8.00%
Customer concentration risk | Local Governments | Contract revenues
Disaggregation of Revenue [Line Items]
Contract revenues		$ 158,990	$ 123,160	$ 99,621
Concentration Risk, Percentage		19.00%	15.00%	14.00%
Customer concentration risk | Private Companies | Contract revenues
Disaggregation of Revenue [Line Items]
Contract revenues		$ 413,974	$ 364,773	$ 399,393
Concentration Risk, Percentage		48.00%	46.00%	56.00%
Geographic concentration | Contract revenues | Foreign
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage		5.00%	7.00%	5.00%