Property And Equipment - Gross Components Of Property And Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment	$ 3,016,312	$ 2,938,154
Vessels
Property, Plant and Equipment [Line Items]
Property and equipment	$ 2,371,084	2,343,162
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
ROVs and Trenchers
Property, Plant and Equipment [Line Items]
Property and equipment	$ 262,763	257,274
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
Machinery, Equipment, Buildings and Other
Property, Plant and Equipment [Line Items]
Property and equipment	$ 382,465	$ 337,718
Machinery, Equipment, Buildings and Other | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Machinery, Equipment, Buildings and Other | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	39 years