Summary Of Major Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Accounting Policies [Abstract]
Foreign Currency Transaction Gain (Loss), before Tax	$ 700	$ 1,100
Right-of-use operating lease assets	323,525		$ 349,751
Increase (Decrease) in Inventories	6,638	8,280
Property, Plant and Equipment [Line Items]
Increase (Decrease) in Inventories	6,638	8,280
Inventory Valuation Reserves	47,000		48,000
Construction in Progress, Gross	$ 41,000		$ 67,000
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Property and Equipment, Long-Lived Intangible Assets and Right-of-Use Operating Lease Assets. We depreciate property and equipment using the straight-line method over estimated useful lives. Remotely Operated Vehicles (“ROVs”) are depreciated over eight years, marine services equipment (such as vessels) over three to 25 years, and buildings, building improvements, manufacturing equipment and other equipment for three to 25 years. We charge the costs of repair and maintenance of property and equipment to operations as incurred, and we capitalize the costs of improvements that extend asset lives or functionality. Upon the disposition of property and equipment, the related cost and accumulated depreciation accounts are relieved and any resulting gain or loss is recognized in income. We capitalize interest on assets where the construction period is anticipated to be more than three months. We do not allocate general administrative costs to capital projects. We did not capitalize interest in the three-month periods ended March 31, 2026 and 2025 related to capital projects. We had construction in progress of $41 million and $67 million as of March 31, 2026 and December 31, 2025, respectively, primarily related to projects in our Subsea Robotics and Offshore Projects Group (“OPG”) segments. Long-lived intangible assets, primarily acquired in connection with business combinations, include trade names, intellectual property and customer relationships and are being amortized over their respective estimated useful lives. Our management periodically, and upon the occurrence of a triggering event, reviews the realizability of our property and equipment, long-lived intangible assets and right-of-use operating lease assets to determine whether any events or changes in circumstances indicate that the carrying amounts of the assets may not be recoverable. For long-lived assets to be held and used, we base our evaluation on impairment indicators such as the nature of the assets, the future economic benefits of the assets, any historical or future profitability measurements and other external market conditions or factors that may be present. If such impairment indicators are present or other factors exist that indicate that the carrying amount of an asset may not be recoverable, we determine whether an impairment has occurred using an undiscounted cash flows analysis of the asset at the lowest level for which identifiable cash flows exist. If an impairment has occurred, we recognize a loss for the difference between the carrying amount and the fair value of the asset. We did not identify indicators of impairment for property and equipment, long-lived intangible assets or right-of-use operating lease assets for the three-month periods ended March 31, 2026 and 2025. For assets held for sale or disposal, the fair value of the asset is measured using fair market value less estimated costs to sell. Assets are classified as held for sale when we have a plan for disposal of certain assets and those assets meet the held for sale criteria. For additional information regarding right-of-use operating lease assets, see “Leases” below.
ROV
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	8 years
Manufactured Products Member
Accounting Policies [Abstract]
Increase (Decrease) in Inventories		(10,000)
Property, Plant and Equipment [Line Items]
Increase (Decrease) in Inventories		$ (10,000)
Minimum [Member] \| Marine Services Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Minimum [Member] \| Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member] \| Marine Services Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	25 years
Maximum [Member] \| Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	25 years