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Property And Equipment - Gross Components Of Property And Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended |
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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 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + 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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