Summary Of Major Accounting Policies Summary of Major Accounting Policies - Dispositions (Details)	12 Months Ended
Dec. 31, 2025
Accounting Policies [Abstract]
Business Combinations and Other Purchase of Business Transactions, Policy [Policy Text Block]	Business Acquisitions. We account for business combinations using the acquisition method of accounting, with acquisition prices being allocated to the assets acquired and liabilities assumed based on their fair values at the respective dates of acquisition. In October 2024, we acquired Global Design Innovation Ltd. (“GDi”), a United Kingdom (“U.K.”)-based provider of digital and software services, for approximately $33 million, including a holdback liability of $4.6 million that we recorded in accrued liabilities and other long-term liabilities on our consolidated balance sheets. As of December 31, 2025, the remaining holdback liability was $3.7 million recorded in accrued liabilities on our consolidated balance sheets, and we expect to make the final payment of this balance in 2026. We acquired cash of $1.0 million from GDi as part of this acquisition. GDi is a U.K.-based provider of asset management, engineering and software services. As the only provider certified by the U.K. Accreditation Service to perform remote visual inspection using point cloud data and photographic images, GDi brings advanced algorithms and data solutions that, when combined with Oceaneering’s engineering expertise, will strengthen Oceaneering’s ability to optimize asset management for customers in industries including oil and gas, utilities, and power generation. GDi’s suite of solutions, including its Vision software, complements Oceaneering’s portfolio by supporting enhanced safety, data quality and integrity, and cost efficiency for customers worldwide. We accounted for this acquisition by allocating the purchase price to the assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition. As part of this acquisition, we recorded goodwill for $16 million and intangible assets relating primarily to GDi’s software and trade name for $17 million to be amortized over their useful lives of 5 years. GDi’s operating results are included in our IMDS segment, and its activity subsequent to the date of acquisition was not significant.

Summary Of Major Accounting Policies Summary of Major Accounting Policies - Dispositions (Details)

12 Months Ended

Dec. 31, 2025

Business Combinations and Other Purchase of Business Transactions, Policy [Policy Text Block]

Business Acquisitions. We account for business combinations using the acquisition method of accounting, with acquisition prices being allocated to the assets acquired and liabilities assumed based on their fair values at the respective dates of acquisition.

In October 2024, we acquired Global Design Innovation Ltd. (“GDi”), a United Kingdom (“U.K.”)-based provider of digital and software services, for approximately $33 million, including a holdback liability of $4.6 million that we recorded in accrued liabilities and other long-term liabilities on our consolidated balance sheets. As of December 31, 2025, the remaining holdback liability was $3.7 million recorded in accrued liabilities on our consolidated balance sheets, and we expect to make the final payment of this balance in 2026. We acquired cash of $1.0 million from GDi as part of this acquisition. GDi is a U.K.-based provider of asset management, engineering and software services. As the only provider certified by the U.K. Accreditation Service to perform remote visual inspection using point cloud data and photographic images, GDi brings advanced algorithms and data solutions that, when combined with Oceaneering’s engineering expertise, will strengthen Oceaneering’s ability to optimize asset management for customers in industries including oil and gas, utilities, and power generation. GDi’s suite of solutions, including its Vision software, complements Oceaneering’s portfolio by supporting enhanced safety, data quality and integrity, and cost efficiency for customers worldwide. We accounted for this acquisition by allocating the purchase price to the assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition. As part of this acquisition, we recorded goodwill for $16 million and intangible assets relating primarily to GDi’s software and trade name for $17 million to be amortized over their useful lives of 5 years. GDi’s operating results are included in our IMDS segment, and its activity subsequent to the date of acquisition was not significant.