Summary Of Major Accounting Policies (Details)

12 Months Ended

Dec. 31, 2025

Disposition [Line Items]

Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions

50.00%

Treasury Stock [Text Block]

Repurchase Plan. In December 2014, our Board of Directors approved a plan to repurchase up to 10 million shares of our common stock on a discretionary basis. Under the program, which has no expiration date, we had repurchased 2.0 million shares for approximately $100 million through December 2015. In the year ended December 31, 2024, we repurchased 0.8 million shares for approximately $20 million. In the year ended December 31, 2025, we repurchased 1.8 million shares for approximately $40 million. As of December 31, 2025, there were approximately 5.4 million shares remaining available for repurchase under this plan and we retained approximately eleven million of the shares we had repurchased through this and a prior repurchase program. We expect to hold the shares repurchased and any additional shares repurchased under the plan as treasury stock for possible future use. The timing and amount of any future repurchases will be determined by our management. We are not obligated to make any future repurchases. We account for the shares we hold in treasury under the cost method, at average cost.

Principles of Consolidation

Principles of Consolidation. The consolidated financial statements include the accounts of Oceaneering International, Inc. (“Oceaneering,” “we,” “us” or “our”) and our 50% or more owned and controlled subsidiaries. We also consolidate entities that are determined to be variable interest entities if we determine that we are the primary beneficiary; otherwise, we account for those entities using the equity method of accounting. We use the equity method to account for our investments in unconsolidated affiliated companies where our equity ownership interest ranges from 20% to 50% and we exercise significant influence without control over operations. We use the cost method for all other long-term investments. Investments in entities that we do not consolidate are presented in other noncurrent assets on our balance sheet. All significant intercompany accounts and transactions have been eliminated.

Use Of Estimates

Use of Estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) requires that our management make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenue and expense during the reporting period. Actual results could differ from those estimates.

Cash and Cash Equivalents

Cash and Cash Equivalents. Cash and cash equivalents include demand deposits and highly liquid investments with original maturities of three months or less from the date of investment.

Inventory

Inventory. Inventory is valued at the lower of cost or net realizable value. We determine cost using the weighted-average method. We periodically review the value of items in inventory and record write-downs or write-offs of inventory based on our assessment of market conditions. Write-downs and write-offs are charged to cost of services and products. In the year ended December 31, 2025, we recorded increases to our inventory reserve of $12 million related primarily to $13 million in write-downs associated with our theme park ride business in our Manufactured Products segment and $2.6 million related to write-downs of inventory deemed to be obsolete in our OPG and Manufactured Products segments. We did not record any write-downs or write-offs of inventory in the years ended December 31, 2024 or 2023. Our inventory reserve was $48 million and $36 million as of December 31, 2025 and 2024, respectively.

Business Acquisitions

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.

Revenue Recognition

Revenue Recognition. All of our revenue is realized through contracts with customers. We recognize our revenue according to the contract type. On a daily basis, we recognize service revenue over time for contracts that provide for specific time, material and equipment charges, which we bill periodically. We use the input method to recognize revenue, because each day of service provided represents value to the customer. The performance obligations in these contracts are satisfied, and revenue is recognized, as the work is performed. When appropriate, we apply the practical expedient to recognize revenue for the amount invoiced when the invoice corresponds directly to the value of our performance to date.

We account for significant fixed-price contracts, primarily within our Manufactured Products segment, and to a lesser extent in our Offshore Projects Group (“OPG”) and Aerospace and Defense Technologies (“ADTech”) segments, by recognizing revenue over time using the cost-to-cost input method. The performance obligation is satisfied as we create a product on behalf of the customer over the life of the contract. In 2025, 2024 and 2023, we accounted for 17%, 19% and 19%, respectively, of our revenue using the cost-to-cost input method to measure progress toward satisfying the related performance obligations on our contracts. The remainder of our revenue is recognized at the point in time when control transfers to the customer, thus satisfying the performance obligation.

We have elected to recognize the cost for freight and shipping as an expense when incurred. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, and that are collected by us from customers, are excluded from revenue.

In our service-based business lines, we principally charge on a dayrate basis for services provided. In our product-based business lines, predominantly in our Manufactured Products segment, we recognize revenue and profit using the percentage-of-completion method and exclude uninstalled materials and significant inefficiencies from the measure of progress.

While our contracts predominantly only contain one performance obligation and a limited number have variable consideration, we apply judgment, when applicable, in the determination and allocation of transaction price to

performance obligations and the subsequent recognition of revenue, based on the facts and circumstances of each contract. We routinely review estimates related to our contracts and, when required, reflect revisions to profitability in earnings immediately. If an element of variable consideration has the potential for a significant future reversal of revenue, we will constrain that variable consideration to a level intended to remove the potential future reversal. If a current estimate of total contract cost indicates an ultimate loss on a contract, we recognize the projected loss in full when we determine it. During the year ended December 31, 2025, we recognized a projected loss of $4.3 million for contracts in our Manufactured Products segment. During the year ended December 31, 2024, we recognized a projected loss of $13 million for contracts in our Manufactured Products segment. During the year ended December 31, 2023, we recognized a projected loss of $9.8 million for contracts in our Manufactured Products segment. There could be adjustments to overall contract costs in the future, due to changes in facts and circumstances.

In general, our payment terms consist of those services billed regularly as provided and those products delivered at a point in time, which are invoiced after the performance obligation is satisfied. Our product and service contracts with milestone payments due at agreed progress points during the contract are invoiced when those milestones are reached, which may differ from the timing of revenue recognition. Our payment terms generally do not provide financing of contracts to customers, nor do we receive financing from customers as a result of these terms.

See Note 3—“Revenue” for more information on our revenue from contracts with customers.

Stock-based Compensation

Stock-Based Compensation. We recognize all share-based payments to directors, officers and employees over their vesting periods in the income statement based on their estimated fair values. For more information on our employee benefit plans, see Note 11—“Employee Benefit Plans.”

Income Taxes

Income Taxes. We provide income taxes at appropriate tax rates in accordance with our interpretation of the respective tax laws and regulations after review and consultation with our internal tax department, tax advisors and, in some cases, legal counsel in various jurisdictions. We provide for deferred income taxes for differences between carrying amounts of assets and liabilities for financial and tax reporting purposes and provide a valuation allowance against deferred tax assets when it is more likely than not that the asset will not be realized.

We recognize an expense or benefit for an uncertain tax position if it is more likely than not to be sustainable upon audit by the applicable taxing authority. If this threshold is met, the uncertain tax position is then measured and recognized at the largest amount that we believe is greater than 50% likely of being realized upon ultimate settlement. We account for any applicable interest and penalties on these uncertain tax positions as a component of our provision for income taxes on our financial statements.

We have elected to account for U.S. federal income tax on global intangible low‑taxed income (“GILTI”) as a current period expense when incurred.

For more information on income taxes, see Note 6—“Income Taxes.”

Foreign Currency Translations

Foreign Currency Translation. The functional currency for most of our foreign subsidiaries is the applicable local currency. Results of operations for foreign subsidiaries with functional currencies other than the U.S. dollar are translated into U.S. dollars using average exchange rates during the period. Assets and liabilities of these foreign subsidiaries are translated into U.S. dollars using the exchange rates in effect as of the balance sheet date, and the resulting translation adjustments are recognized, net of tax, in accumulated other comprehensive income (loss) as a component of shareholders' equity. All foreign currency transaction gains and losses are recognized currently in the consolidated statements of operations. We recorded $2.8 million, $0.9 million and $(1.4) million of foreign currency transaction gains (losses) in the years ended December 31, 2025, 2024 and 2023, respectively. Those amounts are included as a component of other income (expense), net in our consolidated statements of operations.

Derivatives, Policy [Policy Text Block]

Financial Instruments. We recognize all derivative instruments as either assets or liabilities in the balance sheet and measure those instruments at fair value. Subsequent changes in fair value are reflected in current earnings or other comprehensive income (loss), depending on whether a derivative instrument is designated as part of a hedge relationship and, if it is, the type of hedge relationship. See Note 8—“Debt” for information relative to the interest rate swaps we had in effect. We currently have no derivative instruments outstanding as of December 31, 2025 or 2024.

Reclassification, Comparability Adjustment

Reclassifications. Certain amounts from prior periods have been reclassified to conform with the current year presentation.

Goodwill and Intangible Assets, Goodwill, Policy

Goodwill. Our goodwill is evaluated for impairment annually and whenever we identify certain triggering events or circumstances that would more likely than not reduce the fair value of a reporting unit below its carrying amount.

In our annual evaluation of goodwill, we perform a qualitative or quantitative impairment test. Under the qualitative approach, if we determine it is more likely than not that the fair value of a reporting unit is less than its carrying amount, we are required to perform the quantitative analysis to determine the fair value of the reporting unit. We then compare the fair value of the reporting unit with its carrying amount and recognize an impairment loss for the amount by which the carrying amount exceeds the fair value of the reporting unit. The loss recognized should not exceed the total amount of goodwill allocated to the reporting unit. We also consider income tax effects from any tax-deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. During the fourth quarters of 2025 and 2024, we performed our annual goodwill impairment assessment using qualitative tests that did not indicate a more detailed quantitative analysis was necessary. No goodwill impairment was recognized for the years ended December 31, 2025, 2024 and 2023.

Lessee, Leases

Leases. We determine whether a contract is or contains a lease at inception, whether as a lessee or a lessor. We take into consideration the elements of an identified asset, right to control and the receipt of economic benefit in making those determinations.

As a lessor, we lease certain types of equipment along with the provision of services and utilize the expedient allowing us to combine the lease and non-lease components into a combined component that is accounted for (1) under the accounting standard “Leases” (“ASC 842”), when the lease component is predominant, and (2) under the accounting standard “Revenue from Contracts with Customers” (“ASC 606”), when the service component is predominant. In general, when we have a service component, it is typically the predominant element and leads to accounting under ASC 606.

As a lessor, we lease certain types of equipment, often providing services at the same time. These leases can be priced on a dayrate or lump-sum basis for periods ranging from a few days to multi-year contracts. These leases are negotiated on commercial terms at market rates and many carry standard options to extend or terminate at our customer's discretion. These leases generally do not contain options to purchase, material restrictions or covenants that impact our accounting for leases.

As a lessee, we lease land, buildings, vessels and equipment for the operation of our business and to support some of our service line revenue streams. These generally carry lease terms that range from days for operational and support equipment up to twenty years for land and buildings. These leases are negotiated on commercial terms at market rates and many carry standard options to extend or terminate at our discretion. When the exercise of those options is reasonably certain, we include them in the lease assessment. Our leases do not contain material restrictions or covenants that impact our accounting for them, nor do we provide residual value guarantees.

As a lessee, we utilize the practical expedients to not recognize leases with an initial lease term of 12 months or less on the balance sheet and to combine lease and non-lease components together and account for the combined component as a lease for all asset classes, except real estate.

Right-of-use operating lease assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement or modification date. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate, based on the information available at commencement or modification date in determining the present value of future payments. In determining the incremental borrowing rate, we considered our external credit ratings, bond yields for us and our identified peers, the risk-free rate in geographic regions where we operate and the impact associated with providing collateral over a similar term as the lease for an amount equal to the future lease payments. Our right-of-use operating lease assets also include any lease prepayments made and exclude lease incentives and initial direct costs incurred. Our lease terms may include options to extend or terminate the lease. These options are included in the lease term when it is reasonably certain we will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term.

See Note 4—“Leases” for more information on our operating leases.

Earnings Per Share, Policy

Earnings (Loss) per Share. For each year presented, the only difference between our annual calculated weighted-average basic and diluted number of shares outstanding is the effect of outstanding restricted stock units.

Lessee, Operating Leases [Text Block]

LEASES

Supplemental information about our operating leases follows:

		December 31,
(in thousands)		2025		2024
Assets:
	Right-of-use operating lease assets	$	349,751	$	334,721
Liabilities:
	Current	$	128,453	$	131,415
	Noncurrent	257,269		238,325
Lease liabilities		$	385,722	$	369,740

		December 31,
		2025		2024
Lease Term and Discount Rate:
	Weighted-average remaining lease term (years)	5.8		6.0
	Weighted-average discount rate	6.0	%	5.9	%

No impairments of right-of-use operating leases were recorded in the years ended December 31, 2025 and 2024.

Operating lease cost reflects the lease expense resulting from amortization over the respective lease terms of our operating leases with initial lease terms greater than 12 months. Our short-term lease cost consists of expense for our operating leases with initial lease terms of 12 months or less that are not recorded on our balance sheet. The components of lease cost are as follows:

		Year ended December 31,
(in thousands)		2025		2024
Lease Cost:
Operating lease cost	Operating lease cost	$	148,255	$	134,708
Short-term lease cost	Short-term lease cost	49,392		56,477
Total Lease Cost		$	197,647	$	191,185

As of December 31, 2025, future maturities of lease liabilities for our operating leases with an initial lease term of more than 12 months were as follows:

(in thousands)
For the year ended December 31,
2026	$	145,945
2027	83,641
2028	57,991
2029	32,174
2030	26,182
Thereafter	107,145
Total lease payments	453,078
Less: Interest	(67,356)
Present Value of Operating Lease Liabilities	$	385,722