Property And Equipment - Gross Components Of Property And Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment	$ 3,078,571	$ 3,016,312
Vessels
Property, Plant and Equipment [Line Items]
Property and equipment	$ 2,406,089	2,371,084
Vessels | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Vessels | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	30 years
Systems and Equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 337,913	306,316
Systems and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Systems and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
ROVs and Trenchers
Property, Plant and Equipment [Line Items]
Property and equipment	$ 252,753	262,763
ROVs and Trenchers | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
ROVs and Trenchers | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Buildings and Other
Property, Plant and Equipment [Line Items]
Property and equipment	$ 81,816	$ 76,149
Buildings and Other | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Buildings and Other | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	39 years