Summary Of Major Accounting Policies (Policy)	3 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation. Oceaneering International, Inc. ("Oceaneering," "we" or "us") has prepared these unaudited consolidated financial statements pursuant to instructions for quarterly reports on Form 10-Q, which we are required to file with the United States Securities and Exchange Commission (the "SEC"). These financial statements do not include all information and footnotes normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP"). These financial statements reflect all adjustments that we believe are necessary to present fairly our financial position as of March 31, 2020 and our results of operations and cash flows for the periods presented. Except as otherwise disclosed herein, all such adjustments are of a normal and recurring nature. These financial statements should be read in conjunction with the consolidated financial statements and related notes included in our annual report on Form 10-K for the year ended December 31, 2019. The results for interim periods are not necessarily indicative of annual results.
Principles of Consolidation	Principles of Consolidation. The consolidated financial statements include the accounts of Oceaneering 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 of which we own an equity interest of between 20% and 50% and as to which we have significant influence, but not control, over operations. We use the cost method for all other long-term investments. Investments in entities that we do not consolidate are reflected on our balance sheet in other noncurrent assets. All significant intercompany accounts and transactions have been eliminated.
Use Of Estimates	Use of Estimates. The preparation of financial statements in conformity with 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.
Property and Equipment	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 evaluation of goodwill, we perform a qualitative or quantitative impairment test. Under the qualitative approach, if we determine that 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 for the reporting unit. Thereafter, we 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. Our estimates of fair values for our reporting units required us to use significant unobservable inputs, classified as Level 3 fair value measurements, including assumptions related to future performance, risk-adjusted discount rates, future commodity prices and demand for our services and estimates of expected realizable value. For our cash flow projections for the three-months ended March 31, 2020, we utilized a weighted average cost of capital ranging between 12% and 15% and a terminal value based on the Gordon Growth Model assuming an expected long-term growth rate of 2%. Due to the protracted energy downturn compounded with demand destruction and insufficient control of supply levels, our customers' continued focus on cost discipline, and adverse impacts of COVID-19, we determined that impairment indicators were present in the first quarter of 2020 and we were required to perform a quantitative analysis for our Subsea Products-Service, Technology and Rentals ("ST&R"), Subsea Products-Manufactured Products, Subsea Projects, Asset Integrity and Advanced Technologies-Commercial reporting units. Based on these quantitative analyses, the fair value was determined to be less than the carrying value for each of those reporting units with the exclusion of Subsea Products-Manufactured Products. As a result, for our Subsea Products-ST&R, Subsea Projects, Asset Integrity and Advanced Technologies-Commercial reporting units, we recorded pre-tax goodwill impairment losses of $51 million, $130 million, $111 million and $11 million, respectively. For our ROV and Advanced Technologies-Government reporting units, qualitative assessments were performed; and we concluded that it was more likely than not the fair value of the reporting units were more than the carrying value of the reporting unit and, therefore, no impairment was required. In the fourth quarter of 2019, we were required to perform a quantitative analysis for our Subsea Projects and Asset Integrity reporting units. Based on these quantitative tests, we determined that the fair value for our Subsea Projects reporting unit exceeded the carrying amount and there was no impairment. For our Asset Integrity reporting unit, the fair value was less than the carrying value and, as a result, we recorded a pre-tax goodwill impairment loss of $15 million. For the remaining reporting units, qualitative assessments were performed; and we concluded that it was more likely than not the fair value of the reporting unit was more than the carrying value of the reporting unit and, therefore, no impairment was required. Besides the goodwill impairments discussed above, the changes in our reporting units' goodwill balances during the periods presented are from currency exchange rate changes. For information regarding goodwill by business segment, see Note 9-"Operations by Business Segment and Geographic Area."
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 as of the respective dates of acquisition.
Foreign Currency Translations	Foreign Currency Translation. The functional currency for several 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.
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, ranging from weekly to monthly. We use the input method to faithfully depict revenue recognition, 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. We have used the expedient available to recognize revenue when the billing corresponds to the value realized by the customer where appropriate. We account for significant fixed-price contracts, mainly relating to our Subsea Products segment, and to a lesser extent in our Subsea Projects and Advanced Technologies segments, by recognizing revenue over time using an input, cost-to-cost measurement percentage-of-completion method. We use the input cost-to-cost method to faithfully depict revenue recognition. This commonly used method allows appropriate calculation of progress on our contracts. A performance obligation is satisfied as we create a product on behalf of the customer over the life of the contract. 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 Subsea 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. We apply judgment 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, where 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. In prior years, we have recorded adjustments to earnings as a result of revisions to contract estimates; however, we did not have any material adjustments during the three months ended March 31, 2020 and 2019. There could be significant 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.
Leases	Leases. On January 1, 2019 we adopted ASU 2016-02, "Leases (Topic 842"), ("ASC 842"), which requires lessees to recognize right-of-use assets ("ROU assets") and lease liabilities for virtually all leases and updates previous accounting standards for lessors to align certain requirements of the new leases standard and the revenue recognition accounting standard. We elected to apply the transition method that allowed us to apply this update at the adoption date and adopted the package of practical expedients that permitted us to retain the identification and classification of leases made under the previously applicable accounting standards. The adoption of this ASU as of January 1, 2019 resulted in a cumulative effect adjustment of $5.9 million recorded to retained earnings, with corresponding adjustments to increase ROU assets and lease liabilities by $185 million and $191 million, respectively. The adoption of this ASU did not materially affect our net earnings and had no impact on cash flows. Comparative information with respect to prior periods has not been retrospectively restated and continues to be reported under the accounting standards in effect for those periods. 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 these 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 ASC 842, when the lease component is predominant, and (2) under the accounting standard "Revenue from Contracts with Customers" ("ASC 606"), where 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 customers sole 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 to fifteen 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 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 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 that we will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. See "Property and Equipment, Long-Lived Intangible Assets and Right-of-Use Operating Lease Assets" above for more information on determination of impairment indicators for our right-of-use assets

Summary Of Major Accounting Policies (Policy)

3 Months Ended

Mar. 31, 2020

Basis of Presentation. Oceaneering International, Inc. ("Oceaneering," "we" or "us") has prepared these unaudited consolidated financial statements pursuant to instructions for quarterly reports on Form 10-Q, which we are required to file with the United States Securities and Exchange Commission (the "SEC"). These financial statements do not include all information and footnotes normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP"). These financial statements reflect all adjustments that we believe are necessary to present fairly our financial position as of March 31, 2020 and our results of operations and cash flows for the periods presented. Except as otherwise disclosed herein, all such adjustments are of a normal and recurring nature. These financial statements should be read in conjunction with the consolidated financial statements and related notes included in our annual report on Form 10-K for the year ended December 31, 2019. The results for interim periods are not necessarily indicative of annual results.

Principles of Consolidation

Principles of Consolidation. The consolidated financial statements include the accounts of Oceaneering 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 of which we own an equity interest of between 20% and 50% and as to which we have significant influence, but not control, over operations. We use the cost method for all other long-term investments. Investments in entities that we do not consolidate are reflected on our balance sheet in other noncurrent assets. All significant intercompany accounts and transactions have been eliminated.

Use Of Estimates

Use of Estimates. The preparation of financial statements in conformity with 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.

Property and Equipment

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 evaluation of goodwill, we perform a qualitative or quantitative impairment test. Under the qualitative approach, if we determine that 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 for the reporting unit. Thereafter, we 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.

Our estimates of fair values for our reporting units required us to use significant unobservable inputs, classified as Level 3 fair value measurements, including assumptions related to future performance, risk-adjusted discount rates, future commodity prices and demand for our services and estimates of expected realizable value. For our cash flow projections for the three-months ended March 31, 2020, we utilized a weighted average cost of capital ranging between 12% and 15% and a terminal value based on the Gordon Growth Model assuming an expected long-term growth rate of 2%.

Due to the protracted energy downturn compounded with demand destruction and insufficient control of supply levels, our customers' continued focus on cost discipline, and adverse impacts of COVID-19, we determined that impairment indicators were present in the first quarter of 2020 and we were required to perform a quantitative analysis for our Subsea Products-Service, Technology and Rentals ("ST&R"), Subsea Products-Manufactured Products, Subsea Projects, Asset Integrity and Advanced Technologies-Commercial reporting units. Based on these quantitative analyses, the fair value was determined to be less than the carrying value for each of those reporting units with the exclusion of Subsea Products-Manufactured Products. As a result, for our Subsea Products-ST&R, Subsea Projects, Asset Integrity and Advanced Technologies-Commercial reporting units, we recorded pre-tax goodwill impairment losses of $51 million, $130 million, $111 million and $11 million, respectively. For our ROV and Advanced Technologies-Government reporting units, qualitative assessments were performed; and we concluded that it was more likely than not the fair value of the reporting units were more than the carrying value of the reporting unit and, therefore, no impairment was required.

In the fourth quarter of 2019, we were required to perform a quantitative analysis for our Subsea Projects and Asset Integrity reporting units. Based on these quantitative tests, we determined that the fair value for our Subsea Projects reporting unit exceeded the carrying amount and there was no impairment. For our Asset Integrity reporting unit, the fair value was less than the carrying value and, as a result, we recorded a pre-tax goodwill impairment loss of $15 million. For the remaining reporting units, qualitative assessments were performed; and we concluded that it was more likely than not the fair value of the reporting unit was more than the carrying value of the reporting unit and, therefore, no impairment was required.

Besides the goodwill impairments discussed above, the changes in our reporting units' goodwill balances during the periods presented are from currency exchange rate changes. For information regarding goodwill by business segment, see Note 9-"Operations by Business Segment and Geographic Area."

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 as of the respective dates of acquisition.

Foreign Currency Translations

Foreign Currency Translation. The functional currency for several 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.

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, ranging from weekly to monthly. We use the input method to faithfully depict revenue recognition, 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. We have used the expedient available to recognize revenue when the billing corresponds to the value realized by the customer where appropriate.

We account for significant fixed-price contracts, mainly relating to our Subsea Products segment, and to a lesser extent in our Subsea Projects and Advanced Technologies segments, by recognizing revenue over time using an input, cost-to-cost measurement percentage-of-completion method. We use the input cost-to-cost method to faithfully depict revenue recognition. This commonly used method allows appropriate calculation of progress on our contracts. A performance obligation is satisfied as we create a product on behalf of the customer over the life of the contract. 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 Subsea 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.

We apply judgment 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, where 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. In prior years, we have recorded adjustments to earnings as a result of revisions to contract estimates; however, we did not have any material adjustments during the three months ended March 31, 2020 and 2019. There could be significant 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.

Leases

Leases. On January 1, 2019 we adopted ASU 2016-02, "Leases (Topic 842"), ("ASC 842"), which requires lessees to recognize right-of-use assets ("ROU assets") and lease liabilities for virtually all leases and updates previous accounting standards for lessors to align certain requirements of the new leases standard and the revenue recognition accounting standard. We elected to apply the transition method that allowed us to apply this update at the adoption date and adopted the package of practical expedients that permitted us to retain the identification and classification of leases made under the previously applicable accounting standards. The adoption of this ASU as of January 1, 2019 resulted in a cumulative effect adjustment of $5.9 million recorded to retained earnings, with corresponding adjustments to increase ROU assets and lease liabilities by $185 million and $191 million, respectively. The adoption of this ASU did not materially affect our net earnings and had no impact on cash flows. Comparative information with respect to prior periods has not been retrospectively restated and continues to be reported under the accounting standards in effect for those periods.

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 these 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 ASC 842, when the lease component is predominant, and (2) under the accounting standard "Revenue from Contracts with Customers" ("ASC 606"), where 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 customers sole 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 to fifteen 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 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 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 that we will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term.

See "Property and Equipment, Long-Lived Intangible Assets and Right-of-Use Operating Lease Assets" above for more information on determination of impairment indicators for our right-of-use assets