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Property And Equipment - Gross Components Of Property And Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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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 |

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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