Oceaneering International (OII) 10-Q 30 Apr 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	3 Months Ended
	Mar. 31, 2021	Apr. 23, 2021
Document And Entity Information [Abstract]
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	1-10945
Entity Registrant Name	OCEANEERING INTERNATIONAL INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-2628227
Entity Address, Address Line One	11911 FM 529
Entity Address, City or Town	Houston,
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77041
City Area Code	713
Local Phone Number	329-4500
Title of 12(b) Security	Common stock, par value $0.25 per share
Trading Symbol	OII
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		99,752,541
Entity Central Index Key	0000073756
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false
Document Type	10-Q

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Common Stock, Value, Issued	$ 27,709	$ 27,709
Treasury Stock, Common, Value	634,585	660,021
Current Assets:
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	442,743	452,016
Accounts receivable, net	284,480	296,214
Contract assets, net	245,347	221,997
Inventory, net	130,612	141,241
Other current assets	58,335	58,795
Total Current Assets	1,161,517	1,170,263
Property and equipment, at cost	2,448,726	2,456,602
Property and equipment, at cost	1,887,076	1,865,495
Net property and equipment	561,650	591,107
Other Assets:
Goodwill	35,065	35,016
Assets, Noncurrent, Other than Noncurrent Investments and Property, Plant and Equipment	107,829	108,250
Right-of-use operating lease assets	137,463	141,206
Assets, Noncurrent	280,357	284,472
Total Assets	2,003,524	2,045,842
Current Liabilities:
Accounts payable	92,515	94,207
Accrued liabilities	276,322	292,863
Contract liabilities	47,906	50,046
Total current liabilities	416,743	437,116
Long-term debt	804,888	805,251
Long-term operating lease liabilities	150,229	156,074
Other long-term liabilities	83,319	89,244
Commitments and contingencies
Common Stock, Shares, Outstanding	110,834,088
Common Stock, shares authorized (in shares)	360,000,000
Common Stock, par value (in dollars per share)	$ 0.25
Equity:
Additional paid-in capital	$ 168,411	192,492
Retained earnings	1,341,855	1,351,220
Accumulated other comprehensive loss	(361,108)	(359,306)
Oceaneering shareholders' equity	542,282	552,094
Noncontrolling interest	6,063	6,063
Total equity	548,345	558,157
Total Liabilities and Equity	$ 2,003,524	$ 2,045,842
Common Stock, shares issued (in shares)	11,081,546	11,525,725

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - $ / shares	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Common Stock, par value (in dollars per share)	$ 0.25
Common Stock, shares authorized (in shares)	360,000,000
Common Stock, shares issued (in shares)	11,081,546	11,525,725

Consolidated Statements Of Oper

Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Document Period End Date	Mar. 31, 2021
Revenue	$ 437,553	$ 536,668
Cost of services and products	380,896	489,916
Gross margin	56,657	46,752
Selling, general and administrative expense	42,874	55,741
Impairment of Intangible Assets, Finite-lived	0	68,763
Goodwill, Impairment Loss	0	303,005
Income (loss) from operations	13,783	(380,757)
Interest income	519	1,277
Interest expense, net of amounts capitalized	(10,407)	(12,462)
Equity in income (losses) of unconsolidated affiliates	534	1,197
Other income (expense), net	(1,453)	(7,128)
Income (loss) before income taxes	2,976	(397,873)
Provision (benefit) for income taxes	12,341	(30,275)
Net Income (Loss)	$ (9,365)	$ (367,598)
Weighted-average shares outstanding
Basic (in shares)	99,461	99,055
Diluted (in shares)	99,461	99,055
Earnings (loss) per share
Basic (in dollars per share)	$ (0.09)	$ (3.71)
Diluted (in dollars per share)	$ (0.09)	$ (3.71)

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Document Period End Date	Mar. 31, 2021
Net income (loss)	$ (9,365)	$ (367,598)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(2,856)	(70,325)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax	1,054
Other Comprehensive Income (Loss):
Total other comprehensive income (loss)	(1,802)	(70,325)
Comprehensive income (loss)	(11,167)	(437,923)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(2,856)	$ (70,325)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax	$ 1,054

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows from Operating Activities:
Net income (loss)	$ (9,365)	$ (367,598)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization, including goodwill impairment	36,471	356,196
Impairment of Intangible Assets, Finite-lived	0	68,763
Deferred income tax provision (benefit)	(1,136)	(8,405)
Net loss (gain) on sales of property and equipment	152	16
Noncash compensation	3,161	3,116
Other Noncash Income (Expense)	(2,542)	647
Increase (Decrease) in Accounts Receivable	11,616	(30,303)
Excluding the effects of acquisitions, increase (decrease) in cash from:
Inventory	10,628	8,384
Proceeds from Sale of Debt Securities, Available-for-sale	2,361	0
Other operating assets	(1,672)	(11,504)
Currency translation effect on working capital, excluding cash	(670)	(9,302)
Current liabilities	(20,373)	(102,784)
Other operating liabilities	(4,761)	(12,822)
Total adjustments to net income (loss)	7,642	335,448
Net Cash Provided by (Used in) Operating Activities	(1,723)	(32,150)
Cash Flows from Investing Activities:
Purchases of property and equipment	(10,699)	(27,229)
Distributions of capital from unconsolidated affiliates	1,195	405
Proceeds from Sale of Productive Assets	2,136	118
Net Cash Provided by (Used in) Investing Activities	(5,007)	(26,706)
Cash Flows from Financing Activities:
Other financing activities	(1,806)	(1,668)
Net Cash Provided by (Used in) Financing Activities	(1,806)	(1,668)
Effect of exchange rates on cash	(737)	(5,671)
Net Increase (Decrease) in Cash and Cash Equivalents	(9,273)	(66,195)
Cash and Cash Equivalents—Beginning of Period	452,016	373,655
Cash and Cash Equivalents—End of Period	442,743	307,460
Proceeds from Sale of Debt Securities, Available-for-sale	2,361	0
Interest Rate Swap
Excluding the effects of acquisitions, increase (decrease) in cash from:
Proceeds from Sale of Debt Securities, Available-for-sale	0	12,840
Proceeds from Sale of Debt Securities, Available-for-sale	$ 0	$ 12,840

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]Restricted Stock Units (RSUs) [Member]	Additional Paid-in Capital [Member]Restricted Stock [Member]	Treasury Stock [Member]	Treasury Stock [Member]Restricted Stock Units (RSUs) [Member]	Treasury Stock [Member]Restricted Stock [Member]	Retained Earnings [Member]	Retained Earnings [Member]Cumulative Effect, Period of Adoption, Adjustment	Currency Translation Adjustments [Member]	Oceaneering Shareholders' Equity [Member]	Oceaneering Shareholders' Equity [Member]Cumulative Effect, Period of Adoption, Adjustment	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2019	$ 1,075,409	$ 27,709	$ 207,130			$ (681,640)			$ 1,850,244		$ (334,097)	$ 1,069,346		$ 6,063
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(367,598)								(367,598)			(367,598)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(70,325)
Other Comprehensive Income (Loss), Net of Tax	(70,325)											(70,325)
Restricted Stock or Unit Expense	1,446											1,446
Restricted stock and restricted stock unit activity				$ (11,816)	$ (5,992)		$ 13,262	$ 5,992
Ending balance at Mar. 31, 2020	636,659	27,709	189,322			(662,386)			1,480,373		(404,422)	630,596		6,063
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Other	(2,273)									$ (2,273)			$ (2,273)
Right-of-use operating lease assets	141,206
Beginning balance at Dec. 31, 2020	558,157	27,709	192,492			(660,021)			1,351,220		(359,306)	552,094		6,063
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(9,365)								(9,365)			(9,365)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(2,856)
Other Comprehensive Income (Loss), Net of Tax	(1,802)											(1,802)
Restricted Stock or Unit Expense	1,355											1,355
Restricted stock and restricted stock unit activity				$ (13,642)	$ (10,439)		$ 14,997	$ 10,439
Ending balance at Mar. 31, 2021	548,345	$ 27,709	$ 168,411			$ (634,585)			$ 1,341,855		$ (361,108)	$ 542,282		$ 6,063
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Right-of-use operating lease assets	137,463
Financing Receivable, Allowance for Credit Loss	600
Interest Receivable	$ 1,300

Allowance for Credit Loss State

Allowance for Credit Loss Statement - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 548,345	$ 558,157	$ 636,659	$ 1,075,409
Financing Receivable, Allowance for Credit Loss	600
Financing Receivable, Allowance for Credit Loss	$ 600

Accounting Policies

Accounting Policies	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Allowance for Credit Losses [Text Block]	Allowances for Credit Loss—Financial Assets Measured at Amortized Costs. We identify allowances for credit loss based on future expected losses when accounts receivable, contract assets or held-to-maturity loan receivables are created rather than when losses are probable. We use the loss-rate method in developing the allowance for credit losses, which involves identifying pools of assets with similar risk characteristics, reviewing historical losses within the last five years and consideration of reasonable supportable forecasts of economic indicators. Changes in estimates, developing trends and other new information could have material effects on future evaluations. We monitor the credit quality of our accounts receivable and other financing receivable amounts by frequent customer interaction, following economic and industry trends and reviewing specific customer data. Our other receivable amounts include contract assets and held-to-maturity loans receivable, which we consider to have a low risk of loss. We are monitoring the impacts from the coronavirus (COVID-19) outbreak and volatility in the oil and natural gas markets on our customers and various counterparties. We have considered the current and expected economic and market conditions, as a result of COVID-19, in determining credit loss expense for the three-month periods ended March 31, 2021 and 2020. As of March 31, 2021, our allowance for credit losses was $1.5 million for accounts receivable and $0.6 million for other receivables. Financial assets are written off when deemed uncollectible and there is no reasonable expectation of recovering the contractual cash flows. During the three-month period ended March 31, 2021, we wrote off accounts receivable of $2.4 million that previously had been reserved. We have elected to apply the practical expedient available under Accounting Series Codification (“ASC”) 326 to exclude the accrued interest receivable balance that is included in our held-to-maturity loans receivable. The amount excluded as of March 31, 2021 was $1.3 million. Accounts receivable are considered to be past-due after the end of the contractual terms agreed to with the customer. There were no material past-due amounts that we consider uncollectible for our financial assets as of March 31, 2021. We generally do not require collateral from our customers.

Summary Of Major Accounting Pol

Summary Of Major Accounting Policies	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Allowance for Credit Losses [Text Block]	Allowances for Credit Loss—Financial Assets Measured at Amortized Costs. We identify allowances for credit loss based on future expected losses when accounts receivable, contract assets or held-to-maturity loan receivables are created rather than when losses are probable. We use the loss-rate method in developing the allowance for credit losses, which involves identifying pools of assets with similar risk characteristics, reviewing historical losses within the last five years and consideration of reasonable supportable forecasts of economic indicators. Changes in estimates, developing trends and other new information could have material effects on future evaluations. We monitor the credit quality of our accounts receivable and other financing receivable amounts by frequent customer interaction, following economic and industry trends and reviewing specific customer data. Our other receivable amounts include contract assets and held-to-maturity loans receivable, which we consider to have a low risk of loss. We are monitoring the impacts from the coronavirus (COVID-19) outbreak and volatility in the oil and natural gas markets on our customers and various counterparties. We have considered the current and expected economic and market conditions, as a result of COVID-19, in determining credit loss expense for the three-month periods ended March 31, 2021 and 2020. As of March 31, 2021, our allowance for credit losses was $1.5 million for accounts receivable and $0.6 million for other receivables. Financial assets are written off when deemed uncollectible and there is no reasonable expectation of recovering the contractual cash flows. During the three-month period ended March 31, 2021, we wrote off accounts receivable of $2.4 million that previously had been reserved. We have elected to apply the practical expedient available under Accounting Series Codification (“ASC”) 326 to exclude the accrued interest receivable balance that is included in our held-to-maturity loans receivable. The amount excluded as of March 31, 2021 was $1.3 million. Accounts receivable are considered to be past-due after the end of the contractual terms agreed to with the customer. There were no material past-due amounts that we consider uncollectible for our financial assets as of March 31, 2021. We generally do not require collateral from our customers.

Revenue

Revenue	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue	REVENUE Revenue by Category The following tables presents revenue disaggregated by business segment, geographical region, and timing of transfer of goods or services. Three Months Ended (in thousands) Mar 31, 2021 Mar 31, 2020 * Business Segment: Energy Services and Products Subsea Robotics $ 119,119 $ 139,770 Manufactured Products 86,825 166,534 Offshore Projects Group 89,234 74,254 Integrity Management & Digital Solutions 54,048 64,729 Total Energy Services and Products 349,226 445,287 Aerospace and Defense Technologies 88,327 91,381 Total $ 437,553 $ 536,668 * Recast to reflect segment changes. Three Months Ended (in thousands) Mar 31, 2021 Mar 31, 2020 Geographic Operating Areas: Foreign: Africa $ 62,792 $ 63,417 Norway 52,294 52,184 United Kingdom 43,180 60,787 Asia and Australia 37,547 45,680 Brazil 20,653 26,489 Other 20,435 24,659 Total Foreign 236,901 273,216 United States 200,652 263,452 Total $ 437,553 $ 536,668 Timing of Transfer of Goods or Services: Revenue recognized over time $ 408,173 $ 498,307 Revenue recognized at a point in time 29,380 38,361 Total $ 437,553 $ 536,668 Contract Balances Our contracts with milestone payments have, in the aggregate, a significant impact on the contract asset and the contract liability balances. Milestones are contractually agreed with customers and relate to significant events across the contract lives. Some milestones are achieved before revenue is recognized, resulting in a contract liability, while other milestones are achieved after revenue is recognized, resulting in a contract asset. The following table provides information about contract assets and contract liabilities from contracts with customers. Three months ended (in thousands) Mar 31, 2021 Mar 31, 2020 Total contract assets, beginning of period $ 221,997 $ 221,288 Revenue accrued 411,653 455,014 Amounts billed (388,303) (439,195) Total contract assets, end of period $ 245,347 $ 237,107 Total contract liabilities, beginning of period $ 50,046 $ 117,342 Deferrals of milestone payments 24,637 10,625 Recognition of revenue for goods and services (26,777) (66,038) Total contract liabilities, end of period $ 47,906 $ 61,929 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. Performance Obligations As of March 31, 2021, the aggregate amount of the transaction price allocated to remaining performance obligations that were unsatisfied (or partially unsatisfied) was $188 million. In arriving at this value, we have used two practical expedients available to us and are not disclosing amounts in relation to performance obligations: (1) that are part of contracts with an original expected duration of one year or less; or (2) on contracts where we recognize revenue in line with the billing. Of this amount, we expect to recognize revenue of $144 million over the next 12 months, and we expect to recognize substantially all of the remaining balance of $44 million within the next 24 months. Due to the nature of our service contracts in our Subsea Robotics, OPG, Integrity Management & Digital Solutions (“IMDS”) and ADTech segments, the majority of our contracts either have initial contract terms of one year or less or have customer option cancellation clauses that lead us to consider the original expected duration of one year or less. In our Manufactured Products and ADTech segments, we have long-term contracts that extend beyond one year, and these make up the majority of the performance obligations balance reported as of March 31, 2021. We also have shorter-term product contracts with an expected original duration of one year or less that have been excluded. Where appropriate, we have made estimates within the transaction price of elements of variable consideration within the contracts and constrained those amounts to a level where we consider it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. The amount of revenue recognized in the three months ended March 31, 2021 that was associated with performance obligations completed or partially completed in prior periods was not significant. As of March 31, 2021, there were no significant outstanding liability balances for refunds or returns due to the nature of our contracts and the services and products we provide. Our warranties are limited to assurance warranties that are of a standard length and are not considered to be material rights . The majority of our contracts consist of a single performance obligation. When there are multiple obligations, we look for observable evidence of stand-alone selling prices on which to base the allocation. This involves judgment as to the appropriateness of the observable evidence relating to the facts and circumstances of the contract. If we do not have observable evidence, we estimate stand-alone selling prices by taking a cost-plus-margin approach, using typical margins from the type of product or service, customer and regional geography involved. Costs to Obtain or Fulfill a Contract In line with the available practical expedient, we capitalize costs to obtain a contract when those amounts are significant and the contract is expected at inception to exceed one year in duration. Otherwise, the costs are expensed in the period when incurred. Costs to obtain a contract primarily consist of bid and proposal costs, which

Selected Balance Sheet Informat

Selected Balance Sheet Information	3 Months Ended
	Mar. 31, 2021
Balance Sheet Related Disclosures [Abstract]
Selected Balance Sheet Information	SELECTED BALANCE SHEET INFORMATION The following is information regarding selected balance sheet accounts: (in thousands) Mar 31, 2021 Dec 31, 2020 Inventory: Remotely operated vehicle parts and components $ 64,700 $ 62,788 Other inventory, primarily raw materials 65,912 78,453 Total $ 130,612 $ 141,241 Other current assets: Prepaid expenses $ 49,171 $ 48,616 Angolan bonds 9,164 10,179 Total $ 58,335 $ 58,795 Accrued liabilities: Payroll and related costs $ 106,111 $ 135,042 Accrued job costs 50,193 47,721 Income taxes payable 44,015 35,929 Current operating lease liability 18,975 18,798 Other 57,028 55,373 Total $ 276,322 $ 292,863

Debt

Debt	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Debt	DEBT Long-term debt consisted of the following: (in thousands) Mar 31, 2021 Dec 31, 2020 4.650% Senior Notes due 2024 $ 500,000 $ 500,000 6.000% Senior Notes due 2028 300,000 300,000 Interest rate swap settlements 10,224 10,870 Unamortized debt issuance costs (5,336) (5,619) Long-term debt $ 804,888 $ 805,251 In November 2014, we completed the public offering of $500 million aggregate principal amount of 4.650% Senior Notes due 2024 (the “2024 Senior Notes”). We pay interest on the 2024 Senior Notes on May 15 and November 15 of each year. The 2024 Senior Notes are scheduled to mature on November 15, 2024. In February 2018, we completed the public offering of $300 million aggregate principal amount of 6.000% Senior Notes due 2028 (the “2028 Senior Notes”). We pay interest on the 2028 Senior Notes on February 1 and August 1 of each year. The 2028 Senior Notes are scheduled to mature on February 1, 2028. We used the net proceeds from the 2028 Senior Notes to repay our term loan indebtedness described further below. We may redeem some or all of the 2024 Senior Notes and 2028 Senior Notes (collectively, the “Senior Notes”) at specified redemption prices. In October 2014, we entered into a credit agreement (as amended, the “Credit Agreement”) with a group of banks. The Credit Agreement initially provided for a $500 million five-year revolving credit facility (the “Revolving Credit Facility”). Subject to certain conditions, the aggregate commitments under the Revolving Credit Facility may be increased by up to $300 million at any time upon agreement between us and existing or additional lenders. Borrowings under the Revolving Credit Facility may be used for general corporate purposes. The Credit Agreement also provided for a $300 million term loan, which we repaid in full in February 2018, using net proceeds from the issuance of our 2028 Senior Notes referred to above, and cash on hand. In February 2018, we entered into Agreement and Amendment No. 4 to the Credit Agreement ("Amendment No. 4"). Amendment No. 4 amended the Credit Agreement to, among other things, extend the maturity of the Revolving Credit Facility to January 25, 2023 with the extending lenders, which represent 90% of the existing commitments of the lenders, such that the total commitments for the Revolving Credit Facility will be $500 million until October 25, 2021, and thereafter $450 million until January 25, 2023. As of March 31, 2021, we had no borrowings outstanding under the Revolving Credit Facility. Borrowings under the Revolving Credit Facility bear interest at an Adjusted Base Rate or the Eurodollar Rate (both as defined in the Credit Agreement), at our option, plus an applicable margin based on our Leverage Ratio (as defined in the Credit Agreement) and, at our election, based on the ratings of our senior unsecured debt by designated ratings services, thereafter to be based on such debt ratings. The applicable margin varies: (1) in the case of advances bearing interest at the Adjusted Base Rate, from 0.125% to 0.750%; and (2) in the case of advances bearing interest at the Eurodollar Rate, from 1.125% to 1.750%. The Adjusted Base Rate is the highest of (1) the per annum rate established by the administrative agent as its prime rate, (2) the federal funds rate plus 0.50% and (3) the daily one-month LIBOR plus 1%. We pay a commitment fee ranging from 0.125% to 0.300% on the unused portion of the Revolving Credit Facility, depending on our Leverage Ratio. The commitment fees are included as interest expense in our consolidated financial statements. The Credit Agreement contains various covenants that we believe are customary for agreements of this nature, including, but not limited to, restrictions on our ability and the ability of each of our subsidiaries to incur debt, grant liens, make certain investments, make distributions, merge or consolidate, sell assets and enter into certain restrictive agreements. We are also subject to a maximum adjusted total Capitalization Ratio (as defined in the Credit Agreement and which stipulates, that among other items, we exclude any impacts associated with current and prior period impairments) of 55%. The Credit Agreement includes customary events of default and associated remedies. As of March 31, 2021, we were in compliance with all the covenants set forth in the Credit Agreement. We had two interest rate swaps in place relating to a total of $200 million of the 2024 Senior Notes for the period to November 2024. The agreements swapped the fixed interest rate of 4.65% on $100 million of the 2024 Senior Notes to the floating rate of one-month LIBOR plus 2.426% and on another $100 million to one-month LIBOR plus 2.823%. In March 2020, we settled both interest rate swaps with the counterparty for cash proceeds of $13 million. The settlement resulted in a $13 million increase to our long-term debt balance that will be amortized to interest expense prospectively through the maturity date for the 2024 Senior Notes using the effective interest method. As a result, we amortized $0.6 million to interest expense for the three-month period ended March 31, 2021.

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Contingencies Disclosure	COMMITMENTS AND CONTINGENCIES Litigation. In the ordinary course of business, we are, from time to time, involved in litigation or subject to disputes, governmental investigations or claims related to our business activities, including, among other things: • performance- or warranty-related matters under our customer and supplier contracts and other business arrangements; and • workers’ compensation claims, Jones Act claims, occupational hazard claims, premises liability claims and other claims. Although we cannot predict the ultimate outcome of these matters, we believe that our ultimate liability, if any, that may result from these other actions and claims will not have a material adverse effect on our consolidated financial condition, results of operations or cash flows. However, because of the inherent uncertainty of litigation and other dispute resolution proceedings and, in some cases, the availability and amount of potentially available insurance, we can provide no assurance that the resolution of any particular claim or proceeding to which we are a party will not have a material effect on our consolidated financial condition, results of operations or cash flows for the fiscal period in which that resolution occurs. Financial Instruments and Risk Concentration. In the normal course of business, we manage risks associated with foreign exchange rates and interest rates through a variety of strategies, including the use of hedging transactions. As a matter of policy, we do not use derivative instruments unless we have an underlying exposure. Other financial instruments that potentially subject us to concentrations of credit risk are principally cash and cash equivalents and accounts receivable. The carrying values of cash and cash equivalents approximate their fair values due to the short-term maturity of the underlying instruments. Accounts receivable are generated from a broad group of customers, primarily from within the energy industry, which is our major source of revenue. Due to their short-term nature, carrying values of our accounts receivable and accounts payable approximate fair market values. We estimated the aggregate fair market value of the Senior Notes to be $779 million as of March 31, 2021, based on quoted prices. Since the market for the Senior Notes is not an active market, the fair value of the Senior Notes is classified within Level 2 in the fair value hierarchy under U.S. GAAP (inputs other than quoted prices in active markets for similar assets and liabilities that are observable or can be corroborated by observable market data for substantially the full terms for the assets or liabilities). Foreign currency gains (losses) related to the Angolan kwanza of $(1.4) million and $(1.9) million in the three-month periods ended March 31, 2021 and 2020, respectively, were primarily due to the remeasurement of our Angolan kwanza cash balances to U.S. dollars. Foreign currency gain (losses) related to the Brazilian real of $(0.1) million and $(4.0) million in the three-month periods ended March 31, 2021 and 2020, respectively, were primarily due to the remeasurement of our U.S. dollar denominated liability balances to the Brazilian real. We recorded foreign currency transaction losses related to the Angolan kwanza and Brazilian real as a component of other income (expense), net in our Consolidated Statements of Operations. Any conversion of cash balances from kwanza to U.S. dollars is controlled by the central bank in Angola. As of March 31, 2021 and December 31, 2020, we had the equivalent of approximately $3.3 million and $4.7 million, respectively, of kwanza cash balances in Angola reflected on our Consolidated Balance Sheets. To mitigate our currency exposure risk in Angola, we have used kwanza to purchase equivalent Angolan central bank (Banco Nacional de Angola) bonds. The bonds are denominated as U.S. dollar equivalents, so that, upon payment of semi-annual interest and principal upon maturity, payment is made in kwanza, equivalent to the respective U.S. dollars at the then-current exchange rate. As of March 31, 2021 and December 31, 2020, we had $9.2 million and $10 million, respectively, of Angolan bonds on our Consolidated Balance Sheets. Because we intend to sell the bonds if we are able to repatriate the proceeds, we have classified these bonds as available-for-sale securities, and they are recorded in other current assets in our Consolidated Balance Sheets. During the three-month period ended March 31, 2021, we sold a portion of these bonds for $2.4 million and recognized a gain of $0.3 million as a component of other income (expense), net in our Consolidated Statement of Operations. We estimated the fair market value of the Angolan bonds to be $9.2 million and $10 million as of March 31, 2021 and December 31, 2020, respectively, using quoted market prices. Since the market for the Angolan bonds is not an active market, the fair value of the Angolan bonds is classified within Level 2 in the fair value hierarchy under U.S. GAAP. As of March 31, 2021, we have $1.1 million in unrealized gains, net of tax, related to these bonds as a component of accumulated other comprehensive loss in our Consolidated Balance Sheets. Due to the ongoing impact of COVID-19, certain projects that were in process have been delayed in our Manufacturing Products segment. As of March 31, 2021 and December 31, 2020, we had outstanding accounts receivable and contracts assets of approximately $51 million for these projects. We continue to believe these accounts receivable and contract assets are realizable and the projects will resume.

Earnings (Loss) Per Share, Stoc

Earnings (Loss) Per Share, Stock-Based Compensation and Share Repurchase Plan	3 Months Ended
	Mar. 31, 2021
Shareholders' Equity, Earnings Per Share And Stock-Based Compensation [Abstract]
Earnings (Loss) per Share, Share-based Compensation and Share Repurchase Plan	EARNINGS (LOSS) PER SHARE, SHARE-BASED COMPENSATION AND SHARE REPURCHASE PLAN Earnings (Loss) per Share. For each period presented, the only difference between our calculated weighted-average basic and diluted number of shares outstanding is the effect of outstanding restricted stock units. In periods where we have a net loss, the effect of our outstanding restricted stock units is anti-dilutive, and therefore does not increase our diluted shares outstanding. For each period presented, our net income (loss) allocable to both common shareholders and diluted common shareholders is the same as our net income (loss) in our consolidated statements of operations. Share-Based Compensation. We have no outstanding stock options and, therefore, no share-based compensation to be recognized pursuant to stock option grants. During 2019, 2020 and through March 31, 2021, we granted restricted units of our common stock to certain of our key executives and employees. During 2019, 2020 and through March 31, 2021, our Board of Directors granted restricted common stock to our nonemployee directors. The restricted stock units granted to our key executives and key employees generally vest in full on the third anniversary of the award date, conditional on continued employment. The restricted stock unit grants can vest pro rata over three years, provided the individual meets certain age and years-of-service requirements. The shares of restricted stock we grant to our nonemployee directors vest in full on the first anniversary of the award date, conditional on continued service as a director. Each grantee of shares of restricted stock is deemed to be the record owner of those shares during the restriction period, with the right to vote and receive any dividends on those shares. The restricted stock units outstanding have no voting or dividend rights. For each of the restricted stock units granted in 2019 through March 31, 2021, at the earlier of three years after grant or at termination of employment or service, the grantee will be issued one share of our common stock for each unit vested. As of March 31, 2021 and December 31, 2020, respective totals of 2,747,341 and 1,955,346 shares of restricted stock and restricted stock units were outstanding. We estimate that share-based compensation cost not yet recognized related to shares of restricted stock or restricted stock units, based on their grant-date fair values, was $20 million as of March 31, 2021. This expense is being recognized on a graded-vesting basis over three years for awards attributable to individuals meeting certain age and years-of-service requirements, and on a straight-line basis over the applicable vesting period of one or three years for the other awards. Share Repurchase Plan. In December 2014, our Board of Directors approved a share repurchase program under which we may repurchase up to 10 million shares of our common stock on a discretionary basis. Under the program, we had repurchased 2.0 million shares for $100 million through December 31, 2015. We have not repurchased any shares under this plan since December 31, 2015. We account for the shares we hold in treasury under the cost method, at average cost.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Our tax provision is based on (1) our earnings for the period and other factors affecting the tax provision and (2) the operations of foreign branches and subsidiaries that are subject to local income and withholding taxes. Factors that affect our tax rate include our profitability levels in general and the geographical mix from the sources of our results. The effective tax rate for the three-month periods ended March 31, 2021 and 2020 was different than the U.S. federal statutory rate of 21%, primarily due to the geographical mix of operating revenue and results, changes in uncertain tax positions and other discrete items. We do not believe a discussion of the annual effective tax rate is meaningful. We continue to make an assertion to indefinitely reinvest the unrepatriated earnings of any foreign subsidiary that would incur incremental tax consequences upon the distribution of such earnings or deferred taxes related to balance sheet translation gains or losses. On March 27, 2020, the U.S. Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) was signed into law in the United States. In accordance with the recently established rules and procedures under the CARES Act, we filed a 2014 refund claim to carry back our U.S. net operating loss generated in 2019 and amended our 2012 and 2013 federal income tax returns impacted by the net operating loss carryback. Prior to the enactment of the CARES Act, such net operating losses could only be carried forward. As a result, we expect to receive combined refunds of approximately $33 million, of which we have received $5.6 million as of March 31, 2021. The remaining refunds are classified as accounts receivable, net, in our consolidated balance sheet as of March 31, 2021. We also realized a non-cash tax benefit of $8.4 million due to the carryback provision of the CARES Act recognized as a reduction in long-term liabilities. We conduct our international operations in jurisdictions that have varying laws and regulations regarding income and other taxes, some of which are subject to interpretation. We recognize the 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 have accrued a net total of $14 million and $15 million in other long-term liabilities on our balance sheet for worldwide unrecognized tax liabilities as of March 31, 2021 and December 31, 2020, respectively. We account for any applicable interest and penalties related to uncertain tax positions as a component of our provision for income taxes in our consolidated financial statements. Changes in our management's judgment related to those liabilities would affect our effective income tax rate in the periods of change. Our tax returns are subject to audit by taxing authorities in multiple jurisdictions. These audits often take years to complete and settle. The following table lists the earliest tax years open to examination by tax authorities where we have significant operations: Jurisdiction Periods United States 2014 United Kingdom 2019 Norway 2016 Angola 2013 Brazil 2016 Australia 2015 We have ongoing tax audits in various jurisdictions. The outcome of these audits may have an impact on uncertain tax positions for income tax returns subsequently filed in those jurisdictions.

Intangible Assets, Goodwill and

Intangible Assets, Goodwill and Other	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Asset Impairment Charges	IMPAIRMENTS Goodwill We did not identify any triggering events and, accordingly, no impairments of goodwill were recorded in the three-month period ended March 31, 2021. During the first quarter of 2020, due to the protracted energy downturn compounded by demand destruction resulting from the adverse impacts of the COVID-19 pandemic and insufficient control of crude oil supply levels during the quarter, as well as our customers' continued focus on cost discipline, we determined that impairment indicators were present 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 exception 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 Remotely Operated Vehicles (“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 each of those reporting units was more than the carrying value of the reporting unit and, therefore, no impairments were recorded for those reporting units. Our estimates of fair values for our reporting units determined in the first quarter of 2020 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 values. For our cash flow projections for the three-months ended March 31, 2020, we utilized a weighted-average cost of capital ranging from 11% to 15% and a terminal value based on the Gordon Growth Model, assuming an expected long-term growth rate of 2%. Our third quarter 2020 change in our operating segments resulted in one reporting unit for each of our new segments. The following table reflects goodwill impairments as recorded in the three-month period ended March 31, 2020, and allocated, based on historical cost, to the new reporting segments determined in the third quarter of 2020: Three Months Ended March 31, 2020 (in thousands) As originally recorded As recast to reflect segment changes Segment/Reporting Unit Goodwill Impairment Subsea Robotics Manufactured Products OPG IMDS Total Subsea Products/ST&R $ 51,302 $ 17,457 $ — $ 33,845 $ — $ 51,302 Subsea Projects/Subsea Projects 129,562 84,661 — 32,440 12,461 129,562 Asset Integrity/Asset Integrity 110,753 — — — 110,753 110,753 Advanced Technologies/Commercial 11,388 — 11,388 — — 11,388 Total goodwill impairment $ 303,005 $ 102,118 $ 11,388 $ 66,285 $ 123,214 $ 303,005 Aside from the goodwill impairments discussed above, the changes in our reporting units' goodwill balances during the periods presented are from currency exchange rate changes. For further information regarding goodwill by business segment, see Note 10–“Business Segment Information.” Property and Equipment and Intangible Assets We did not identify any triggering events and, accordingly, no impairments of long-lived assets were recorded in the three-month period ended March 31, 2021. During the first quarter of 2020, due to the protracted energy downturn compounded by demand destruction resulting from the adverse impacts of the COVID-19 pandemic and insufficient control of crude oil supply levels during the quarter, as well as our customers' continued focus on cost discipline, we determined that impairment indicators were present within certain of our asset groups. To measure fair value for these asset groups, we used the following approaches: • Subsea Distribution Solutions U.K. - We utilized the cost approach and considered economic obsolescence under the income approach to determine fair value of the property and equipment. • Subsea Distribution Solutions Brazil and Angola - We utilized a combination of market and cost approaches to measure fair values. • Shallow Water vessels - We utilized the cost approach and considered historical, current and anticipated dayrates and utilization to measure market value. • Renewables and Special Projects - We utilized a combination of market and cost approaches to measure fair values. • Oceaneering Entertainment Systems and Oceaneering Automated Guided Vehicles (“AGV”) Systems - We utilized a combination of market and cost approaches to measure fair value. Our estimates of fair value for these asset groups determined in the first quarter of 2020 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. Our cash flow projections utilized a weighted-average cost of capital ranging from 12% to 15% and a terminal value based on the Gordon Growth Model, assuming an expected long-term growth rate of 2%. As a result, we determined that the carrying values exceeded the estimated fair values and recorded impairments as noted below. Our third quarter 2020 change in operating segments did not result in any changes in our asset groups. The following table reflects long-lived asset impairments as recorded in the three-month period ended March 31, 2020, and assigned to the new reporting segments determined in the third quarter of 2020: Three Months Ended March 31, 2020 (in thousands) As originally recorded As recast to reflect segment changes Segment/Reporting Unit Long-lived Asset Impairments Manufactured Products OPG IMDS Total Subsea Products Subsea Distribution Solutions U.K. $ 6,543 $ 6,543 $ — $ — $ 6,543 Subsea Distribution Solutions Brazil 9,834 9,834 9,834 Subsea Distribution Solutions Angola 38,482 38,482 38,482 Subsea Projects Shallow Water vessels 3,894 3,894 3,894 Renewables and Special Projects Group 3,628 3,628 3,628 Global Data Solutions 167 167 167 Advanced Technologies Oceaneering Entertainment Systems 5,065 5,065 5,065 Oceaneering AGV Systems 1,150 1,150 1,150 Total long-lived asset impairments $ 68,763 $ 61,074 $ 7,522 $ 167 $ 68,763

Summary Of Major Accounting P_2

Summary Of Major Accounting Policies (Policy)	3 Months Ended
	Mar. 31, 2021
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, 2021 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, 2020. 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. 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. We did not record any write-downs or write-offs of inventory in the in the three-month periods ended March 31, 2021 and 2020.
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.
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 $(1.9) million and $(7.1) million of foreign currency transaction gains (losses) in the three-month periods ended March 31, 2021 and 2020, respectively, and those amounts are included as a component of other income (expense), net in our Consolidated Statement of Operations.
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 “ 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 to 15 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 that we will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term.
Comparability of Prior Year Financial Data, Policy	Recasting of Certain Prior Period Information. In the third quarter of 2020, we changed our organizational structure as part of the transformation to realign our businesses to achieve greater cost efficiencies and to bring together business units that frequently work together and promote increased synergies in bidding, project management and the use of offshore technicians. As a result, information that our chief operating decision maker regularly reviews changed. Therefore, for the three-month period ended March 31, 2021, we are reporting our financial results consistent with our newly realigned operating segments and have recast certain prior period amounts to conform to the way we now manage our businesses and monitor segment performance as described in Note 3–“Revenue” and Note 10–“Business Segment Information.” We also changed our reporting units to realign with the changes in our operating segments and reassessed impairments for long-lived assets and goodwill as described in Note 4–“Impairments.”
Revenue	Revenue Recognition. All 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. 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, mainly relating to 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 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 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. 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, 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. 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, 2021 and 2020. 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.
New Accounting Pronouncements, Policy	Recently Issued Accounting Standards . In March 2020, the Financial Accounting Standards Board issued ASU No. 2020-04, “ Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting,” which provides temporary optional expedients and exceptions to existing guidance on applying contract modifications and hedge accounting to facilitate the market transition from existing reference rates, such as the London Interbank Offered Rate (“LIBOR”), which is scheduled to be phased out in June 2023, to alternate rates such as the Secured Overnight Financing Rate (“SOFR”). This ASU was effective upon issuance and can be applied

Allowance for Credit Losses Not

Allowance for Credit Losses Notes (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Policies Credit Losses [Abstract]
Allowance for Credit Losses [Text Block]	Allowances for Credit Loss—Financial Assets Measured at Amortized Costs. We identify allowances for credit loss based on future expected losses when accounts receivable, contract assets or held-to-maturity loan receivables are created rather than when losses are probable. We use the loss-rate method in developing the allowance for credit losses, which involves identifying pools of assets with similar risk characteristics, reviewing historical losses within the last five years and consideration of reasonable supportable forecasts of economic indicators. Changes in estimates, developing trends and other new information could have material effects on future evaluations. We monitor the credit quality of our accounts receivable and other financing receivable amounts by frequent customer interaction, following economic and industry trends and reviewing specific customer data. Our other receivable amounts include contract assets and held-to-maturity loans receivable, which we consider to have a low risk of loss. We are monitoring the impacts from the coronavirus (COVID-19) outbreak and volatility in the oil and natural gas markets on our customers and various counterparties. We have considered the current and expected economic and market conditions, as a result of COVID-19, in determining credit loss expense for the three-month periods ended March 31, 2021 and 2020. As of March 31, 2021, our allowance for credit losses was $1.5 million for accounts receivable and $0.6 million for other receivables. Financial assets are written off when deemed uncollectible and there is no reasonable expectation of recovering the contractual cash flows. During the three-month period ended March 31, 2021, we wrote off accounts receivable of $2.4 million that previously had been reserved. We have elected to apply the practical expedient available under Accounting Series Codification (“ASC”) 326 to exclude the accrued interest receivable balance that is included in our held-to-maturity loans receivable. The amount excluded as of March 31, 2021 was $1.3 million. Accounts receivable are considered to be past-due after the end of the contractual terms agreed to with the customer. There were no material past-due amounts that we consider uncollectible for our financial assets as of March 31, 2021. We generally do not require collateral from our customers.

Accounting Standards Updated (P

Accounting Standards Updated (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Changes and Error Corrections [Abstract]
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	Recently Adopted Accounting Standards . On January 1, 2021, we adopted Accounting Standards Update (“ASU”) No. 2019-12, “ Simplifying the Accounting for Income Taxes” (“ASU 2019-12”), which simplifies the accounting for income taxes, eliminates certain exceptions within Accounting Standards Codification 740 (“ASC 740”), “ Income Taxe s,” and clarifies certain aspects of the current guidance to promote consistency among reporting entities. Most amendments within the standard are required to be applied on a prospective basis, while certain amendments must be applied on a retrospective or modified retrospective basis. Our adoption of ASU 2019-12 on January 1, 2021, did not have a material impact on our consolidated financial statements.

Summary Of Major Accounting P_3

Summary Of Major Accounting Policies Long-lived Assets (Tables)	3 Months Ended
	Mar. 31, 2021	Sep. 30, 2020
Accounting Policies [Abstract]
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]	Property and Equipment, Long-Lived Intangible Assets and Right-of-Use Operating Lease Assets. We provide for depreciation of property and equipment on the straight-line method over estimated useful lives. 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 included as an adjustment to cost of services and products. We capitalize interest on assets where the construction period is anticipated to be more than three months. We did not capitalize interest in the three-month periods ended March 31, 2021 and 2020. We do not allocate general administrative costs to capital projects. 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 through the use of 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. For additional information regarding write-downs and write-offs of property and equipment, long-lived intangible assets and right-of-use operating lease assets in the three-month period ended March 31, 2020, see Note 4—“Impairments” and Note 10—“Business Segment Information.” We did not identify indicators of impairment for property and equipment, long-lived intangible assets and right-of-use operating lease assets for the three-month period ended March 31, 2021. 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.	Three Months Ended March 31, 2020 (in thousands) As originally recorded As recast to reflect segment changes Segment/Reporting Unit Long-lived Asset Impairments Manufactured Products OPG IMDS Total Subsea Products Subsea Distribution Solutions U.K. $ 6,543 $ 6,543 $ — $ — $ 6,543 Subsea Distribution Solutions Brazil 9,834 9,834 9,834 Subsea Distribution Solutions Angola 38,482 38,482 38,482 Subsea Projects Shallow Water vessels 3,894 3,894 3,894 Renewables and Special Projects Group 3,628 3,628 3,628 Global Data Solutions 167 167 167 Advanced Technologies Oceaneering Entertainment Systems 5,065 5,065 5,065 Oceaneering AGV Systems 1,150 1,150 1,150 Total long-lived asset impairments $ 68,763 $ 61,074 $ 7,522 $ 167 $ 68,763

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue from External Customers by Products and Services	Three Months Ended (in thousands) Mar 31, 2021 Mar 31, 2020 * Business Segment: Energy Services and Products Subsea Robotics $ 119,119 $ 139,770 Manufactured Products 86,825 166,534 Offshore Projects Group 89,234 74,254 Integrity Management & Digital Solutions 54,048 64,729 Total Energy Services and Products 349,226 445,287 Aerospace and Defense Technologies 88,327 91,381 Total $ 437,553 $ 536,668 * Recast to reflect segment changes. Three Months Ended (in thousands) Mar 31, 2021 Mar 31, 2020 Geographic Operating Areas: Foreign: Africa $ 62,792 $ 63,417 Norway 52,294 52,184 United Kingdom 43,180 60,787 Asia and Australia 37,547 45,680 Brazil 20,653 26,489 Other 20,435 24,659 Total Foreign 236,901 273,216 United States 200,652 263,452 Total $ 437,553 $ 536,668 Timing of Transfer of Goods or Services: Revenue recognized over time $ 408,173 $ 498,307 Revenue recognized at a point in time 29,380 38,361 Total $ 437,553 $ 536,668
Contract with Customer, Asset and Liability [Table Text Block]	The following table provides information about contract assets and contract liabilities from contracts with customers. Three months ended (in thousands) Mar 31, 2021 Mar 31, 2020 Total contract assets, beginning of period $ 221,997 $ 221,288 Revenue accrued 411,653 455,014 Amounts billed (388,303) (439,195) Total contract assets, end of period $ 245,347 $ 237,107 Total contract liabilities, beginning of period $ 50,046 $ 117,342 Deferrals of milestone payments 24,637 10,625 Recognition of revenue for goods and services (26,777) (66,038) Total contract liabilities, end of period $ 47,906 $ 61,929

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Schedule of Debt	Long-term debt consisted of the following: (in thousands) Mar 31, 2021 Dec 31, 2020 4.650% Senior Notes due 2024 $ 500,000 $ 500,000 6.000% Senior Notes due 2028 300,000 300,000 Interest rate swap settlements 10,224 10,870 Unamortized debt issuance costs (5,336) (5,619) Long-term debt $ 804,888 $ 805,251

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Summary of Income Tax Examinations	The following table lists the earliest tax years open to examination by tax authorities where we have significant operations: Jurisdiction Periods United States 2014 United Kingdom 2019 Norway 2016 Angola 2013 Brazil 2016 Australia 2015

Business Segment Information (T

Business Segment Information (Tables)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Segment Reporting, Measurement Disclosures [Abstract]
Financial Data By Business Segment	The table that follows presents revenue, income (loss) from operations and depreciation and amortization expense by business segment: Three Months Ended (in thousands) Mar 31, 2021 Mar 31, 2020 * Dec 31, 2020 Revenue Energy Services and Products Subsea Robotics $ 119,119 $ 139,770 $ 114,711 Manufactured Products 86,825 166,534 99,899 Offshore Projects Group 89,234 74,254 67,821 Integrity Management & Digital Solutions 54,048 64,729 54,307 Total Energy Services and Products 349,226 445,287 336,738 Aerospace and Defense Technologies 88,327 91,381 87,524 Total $ 437,553 $ 536,668 $ 424,262 Income (Loss) from Operations Energy Services and Products Subsea Robotics $ 14,619 $ (94,083) $ 14,477 Manufactured Products 2,753 (66,138) 12,218 Offshore Projects Group 8,813 (79,323) (9,940) Integrity Management & Digital Solutions 2,474 (121,535) 892 Total Energy Services and Products 28,659 (361,079) 17,647 Aerospace and Defense Technologies 16,839 12,971 16,525 Unallocated Expenses (31,715) (32,649) (33,692) Total $ 13,783 $ (380,757) $ 480 Depreciation and Amortization, including Goodwill Impairment Energy Services and Products Subsea Robotics $ 22,952 $ 139,187 $ 23,210 Manufactured Products 3,227 15,964 3,193 Offshore Projects Group 7,125 74,907 16,979 Integrity Management & Digital Solutions 1,124 124,343 1,255 Total Energy Services and Products 34,428 354,401 44,637 Aerospace and Defense Technologies 1,276 687 667 Unallocated Expenses 767 1,108 1,146 Total $ 36,471 $ 356,196 $ 46,450 * Recast to reflect segment changes.
Adjustments Table		During the three-month period ended December 31, 2020, we recorded adjustments attributable to each of our reporting segments as follows: For the Three Months Ended December 31, 2020 (in thousands) Subsea Robotics Manufactured Products OPG IMDS ADTech Unallocated Expenses Total Adjustments for the effects of: Long-lived assets impairments — $ — $ 1,304 $ 378 $ — $ — $ 1,682 Long-lived assets write-offs — — 9,401 170 — — 9,571 Other 221 (3,489) 643 422 27 — (2,176) Total of adjustments $ 221 $ (3,489) $ 11,348 $ 970 $ 27 $ — $ 9,077	During the three-month period ended March 31, 2020, we recorded adjustments attributable to each of our reporting segments as follows: For the Three Months Ended March 31, 2020 (in thousands) Subsea Robotics Manufactured Products OPG IMDS ADTech Unallocated Expenses Total Adjustments for the effects of: Long-lived assets impairments $ — $ 61,074 $ 7,522 $ 167 $ — $ — $ 68,763 Long-lived assets write-offs 7,328 — — — — — 7,328 Goodwill impairment 102,118 11,388 66,285 123,214 — — 303,005 Other 919 1,984 1,216 2,231 — 280 6,630 Total of adjustments $ 110,365 $ 74,446 $ 75,023 $ 125,612 $ — $ 280 $ 385,726

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2021
Accounting Policies Credit Losses [Abstract]
Allowance for Credit Losses [Text Block]	Allowances for Credit Loss—Financial Assets Measured at Amortized Costs. We identify allowances for credit loss based on future expected losses when accounts receivable, contract assets or held-to-maturity loan receivables are created rather than when losses are probable. We use the loss-rate method in developing the allowance for credit losses, which involves identifying pools of assets with similar risk characteristics, reviewing historical losses within the last five years and consideration of reasonable supportable forecasts of economic indicators. Changes in estimates, developing trends and other new information could have material effects on future evaluations. We monitor the credit quality of our accounts receivable and other financing receivable amounts by frequent customer interaction, following economic and industry trends and reviewing specific customer data. Our other receivable amounts include contract assets and held-to-maturity loans receivable, which we consider to have a low risk of loss. We are monitoring the impacts from the coronavirus (COVID-19) outbreak and volatility in the oil and natural gas markets on our customers and various counterparties. We have considered the current and expected economic and market conditions, as a result of COVID-19, in determining credit loss expense for the three-month periods ended March 31, 2021 and 2020. As of March 31, 2021, our allowance for credit losses was $1.5 million for accounts receivable and $0.6 million for other receivables. Financial assets are written off when deemed uncollectible and there is no reasonable expectation of recovering the contractual cash flows. During the three-month period ended March 31, 2021, we wrote off accounts receivable of $2.4 million that previously had been reserved. We have elected to apply the practical expedient available under Accounting Series Codification (“ASC”) 326 to exclude the accrued interest receivable balance that is included in our held-to-maturity loans receivable. The amount excluded as of March 31, 2021 was $1.3 million. Accounts receivable are considered to be past-due after the end of the contractual terms agreed to with the customer. There were no material past-due amounts that we consider uncollectible for our financial assets as of March 31, 2021. We generally do not require collateral from our customers.

Intangible Assets, Goodwill a_2

Intangible Assets, Goodwill and Other (Tables)	3 Months Ended
	Mar. 31, 2021	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]	Property and Equipment, Long-Lived Intangible Assets and Right-of-Use Operating Lease Assets. We provide for depreciation of property and equipment on the straight-line method over estimated useful lives. 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 included as an adjustment to cost of services and products. We capitalize interest on assets where the construction period is anticipated to be more than three months. We did not capitalize interest in the three-month periods ended March 31, 2021 and 2020. We do not allocate general administrative costs to capital projects. 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 through the use of 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. For additional information regarding write-downs and write-offs of property and equipment, long-lived intangible assets and right-of-use operating lease assets in the three-month period ended March 31, 2020, see Note 4—“Impairments” and Note 10—“Business Segment Information.” We did not identify indicators of impairment for property and equipment, long-lived intangible assets and right-of-use operating lease assets for the three-month period ended March 31, 2021. 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.	Three Months Ended March 31, 2020 (in thousands) As originally recorded As recast to reflect segment changes Segment/Reporting Unit Long-lived Asset Impairments Manufactured Products OPG IMDS Total Subsea Products Subsea Distribution Solutions U.K. $ 6,543 $ 6,543 $ — $ — $ 6,543 Subsea Distribution Solutions Brazil 9,834 9,834 9,834 Subsea Distribution Solutions Angola 38,482 38,482 38,482 Subsea Projects Shallow Water vessels 3,894 3,894 3,894 Renewables and Special Projects Group 3,628 3,628 3,628 Global Data Solutions 167 167 167 Advanced Technologies Oceaneering Entertainment Systems 5,065 5,065 5,065 Oceaneering AGV Systems 1,150 1,150 1,150 Total long-lived asset impairments $ 68,763 $ 61,074 $ 7,522 $ 167 $ 68,763
Schedule of Intangible Assets and Goodwill		The following table reflects goodwill impairments as recorded in the three-month period ended March 31, 2020, and allocated, based on historical cost, to the new reporting segments determined in the third quarter of 2020: Three Months Ended March 31, 2020 (in thousands) As originally recorded As recast to reflect segment changes Segment/Reporting Unit Goodwill Impairment Subsea Robotics Manufactured Products OPG IMDS Total Subsea Products/ST&R $ 51,302 $ 17,457 $ — $ 33,845 $ — $ 51,302 Subsea Projects/Subsea Projects 129,562 84,661 — 32,440 12,461 129,562 Asset Integrity/Asset Integrity 110,753 — — — 110,753 110,753 Advanced Technologies/Commercial 11,388 — 11,388 — — 11,388 Total goodwill impairment $ 303,005 $ 102,118 $ 11,388 $ 66,285 $ 123,214 $ 303,005

Accounting Policies (Details)

Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss	$ 600
Interest Receivable	1,300
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	548,345	$ 636,659	$ 558,157	$ 1,075,409
Interest Receivable	1,300
Financing Receivable, Allowance for Credit Loss	600
Accounts and Financing Receivable, Allowance for Credit Loss	1,500
Foreign Currency Transaction Gain (Loss), before Tax	(1,900)	$ (7,100)
Accounts Receivable [Member]
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	2,400
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 2,400

Summary Of Major Accounting P_4

Summary Of Major Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Property, Plant and Equipment [Line Items]
Impairment property plant equipment			$ 68,763
Impairment of Long-Lived Assets Held-for-use		$ 1,682	68,763
Right-of-use operating lease assets	$ 137,463	$ 141,206
Goodwill, Impairment Loss	0		303,005
Financing Receivable, Allowance for Credit Loss	600
Interest Receivable	1,300
Accounts Receivable [Member]
Property, Plant and Equipment [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	2,400
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 2,400
Maximum [Member]
Property, Plant and Equipment [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Minimum [Member]
Property, Plant and Equipment [Line Items]
Threshold for consolidation, percentage	50.00%
Equity Method Investment, Ownership Percentage	20.00%
Shallow Water [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment			3,894
Oceaneering Entertainment System [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment			5,065
Ecosse [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment			3,628
Oceaneering AGV System [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment			1,150
SDS Rosyth [Member]
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets Held-for-use			6,543
Global Data Solution [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment			167
SDS Brazil [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment			9,834
Subsea Products Angola [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment			$ 38,482
Property Subject to Operating Lease [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Operating Leases, Operating Lease Term	15 years

Summary Of Major Accounting P_5

Summary Of Major Accounting Policies Goodwill Impairment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 0	$ 303,005
Subsea Products [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss		51,302
Subsea Projects [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss		129,562
Asset Integrity [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss		110,753
Advanced Technologies [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss		$ 11,388

Summary Of Major Accounting P_6

Summary Of Major Accounting Policies Long-lived asset impairments (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2020USD ($)	Mar. 31, 2020USD ($)units
Impaired Long-Lived Assets Held and Used [Line Items]
Write-off Equipment and Intangibles	$ 9,600	$ 7,300
Impairment property plant equipment		68,763
Impairment of Long-Lived Assets Held-for-use	$ 1,682	$ 68,763
Minimum [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Alternative Investment, Measurement Input | units		0.11
Maximum [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Alternative Investment, Measurement Input | units		0.15
Weighted Average [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Alternative Investment, Measurement Input | units		0.12
Measurement Input, Long-term Revenue Growth Rate [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Alternative Investment, Measurement Input | units		0.02
Oceaneering AGV System [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment property plant equipment		$ 1,150
Oceaneering Entertainment System [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment property plant equipment		5,065
Global Data Solution [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment property plant equipment		167
Ecosse [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment property plant equipment		3,628
Shallow Water [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment property plant equipment		3,894
Subsea Products Angola [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment property plant equipment		38,482
SDS Brazil [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment property plant equipment		9,834
SDS Rosyth [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Long-Lived Assets Held-for-use		$ 6,543

Summary Of Major Accounting P_7

Summary Of Major Accounting Policies Allowance for credit losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 600
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	548,345	$ 558,157	$ 636,659	$ 1,075,409
Interest Receivable	1,300
Accounts Receivable [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 2,400

Summary Of Major Accounting P_8

Summary Of Major Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Accounting Policies [Abstract]
Foreign Currency Transaction Gain (Loss), before Tax	$ (1,900)	$ (7,100)
Right-of-use operating lease assets	$ 137,463		$ 141,206

Revenue - Disaggregation of Rev

Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 437,553	$ 424,262	$ 536,668
Brazil [Member]
Segment Reporting Information [Line Items]
Revenues	20,653		26,489
Non-US [Member]
Segment Reporting Information [Line Items]
Revenues	$ 236,901		$ 273,216

Revenue - Revenue by Geographic

Revenue - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Revenue by Geographic Area [Line Items]
Revenues	$ 437,553	$ 424,262	$ 536,668
Africa [Member]
Revenue by Geographic Area [Line Items]
Revenues	62,792		63,417
United Kingdom [Member]
Revenue by Geographic Area [Line Items]
Revenues	43,180		60,787
Norway [Member]
Revenue by Geographic Area [Line Items]
Revenues	52,294		52,184
Asia Pacific [Member]
Revenue by Geographic Area [Line Items]
Revenues	37,547		45,680
Brazil [Member]
Revenue by Geographic Area [Line Items]
Revenues	20,653		26,489
Other Geographical [Member]
Revenue by Geographic Area [Line Items]
Revenues	20,435		24,659
Non-US [Member]
Revenue by Geographic Area [Line Items]
Revenues	236,901		273,216
UNITED STATES
Revenue by Geographic Area [Line Items]
Revenues	$ 200,652		$ 263,452

Revenue - Revenue by Timing of

Revenue - Revenue by Timing of Transfer of Goods or Services (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Deferred Revenue Arrangement [Line Items]
Revenues	$ 437,553	$ 424,262	$ 536,668
Energy Services and Products Member
Deferred Revenue Arrangement [Line Items]
Revenues	349,226	$ 336,738	445,287
Transferred at Point in Time [Member]
Deferred Revenue Arrangement [Line Items]
Revenues	29,380		38,361
Transferred over Time [Member]
Deferred Revenue Arrangement [Line Items]
Revenues	$ 408,173		$ 498,307

Revenue - Contract balances (De

Revenue - Contract balances (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract assets, net	$ 245,347	$ 237,107	$ 221,997	$ 221,288
Deferred Revenue, Revenue Recognized	411,653	455,014
Billings - Contract Assets	(388,303)	(439,195)
Revenue recognized	(26,777)	(66,038)
Deferrals of customer payments	24,637	10,625
Capitalized Contract Cost, Amortization	(1,000)	(1,900)
Contract liabilities	$ 47,906	$ 61,929	$ 50,046	$ 117,342

Revenue - Performance obligatio

Revenue - Performance obligation (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Revenue from Contract with Customer [Abstract]
Price allocated to remaining performance obligations	$ 188,000
Revenue recognition for remaining performance obligations	144,000
Revenue Recognition for Remaining Performance Obligations in next 24 months	$ 44,000

Revenue - Costs to obtain or fu

Revenue - Costs to obtain or fulfill a contract (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Capitalized Contract Cost, Net	$ 8,100		$ 8,300
Capitalized Contract Cost, Amortization	$ (1,000)	$ (1,900)

Selected Balance Sheet Inform_2

Selected Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Inventory [Line Items]
Liability for Uncertainty in Income Taxes, Noncurrent	$ 14,000	$ 15,000
Inventory:
Remotely operated vehicle parts and components	65,912	78,453
Other inventory, primarily raw materials	64,700	62,788
Total	130,612	141,241
Other current assets:
Prepaid expenses	49,171	48,616
Angolan bonds	9,164	10,179
Total	58,335	58,795
Accrued liabilities:
Payroll and related costs	106,111	135,042
Accounts Payable, Other, Current	50,193	47,721
Income taxes payable	44,015	35,929
Current operating lease liability	18,975	18,798
Other	57,028	55,373
Total	$ 276,322	$ 292,863

Debt - Schedule of Long-Term De

Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Document Period End Date	Mar. 31, 2021
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	$ 10,224
Unamortized debt issuance costs	(5,336)	$ (5,619)
Long-term Debt	$ 804,888	$ 805,251

Debt - Additional Information (

Debt - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Oct. 31, 2014	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2018	Dec. 31, 2014	Dec. 31, 2020	Feb. 28, 2018	Nov. 30, 2014
Line of Credit Facility [Line Items]
Document Period End Date		Mar. 31, 2021
Maximum capitalization ratio		55.00%
Interest rate swap principal			$ 200,000,000
Derivative, Variable Interest Rate			2.823%
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Adjustment			$ 13,000,000
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Accumulated Amortization		$ 600,000
Payments of financing costs					$ 3,000,000
Minimum [Member]
Line of Credit Facility [Line Items]
Commitment fee percentage		0.125%
Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fee percentage		0.30%
Senior Notes due 2024 [Member]
Line of Credit Facility [Line Items]
Senior notes		$ 500,000,000				$ 500,000,000		$ 500,000,000
Interest rate, stated percentage								4.65%
Derivative Liability, Notional Amount			$ 100,000,000
Payments of debt issuance costs					$ 6,900,000
Senior Notes due 2024 [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Derivative, Variable Interest Rate			2.426%
Senior Notes due 2028 [Member]
Line of Credit Facility [Line Items]
Senior notes		$ 300,000,000				$ 300,000,000	$ 300,000,000
Interest rate, stated percentage							6.00%
Payments of debt issuance costs				$ 4,200,000
Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 500,000,000
Debt instrument, term	5 years
Available additional borrowing capacity	$ 300,000,000
Face amount	$ 300,000,000
Percent of commitments affected by amendment							90.00%
Line of Credit [Member] | October 25, 2021 [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity							$ 500,000,000
Line of Credit [Member] | January 25, 2023 [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity							$ 450,000,000
Credit Agreement [Member] | Applicable Margin [Member] | Minimum [Member] | Adjusted Base Rate Advances [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.125%
Credit Agreement [Member] | Applicable Margin [Member] | Minimum [Member] | Eurodollar Advances [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.125%
Credit Agreement [Member] | Applicable Margin [Member] | Maximum [Member] | Adjusted Base Rate Advances [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.75%
Credit Agreement [Member] | Applicable Margin [Member] | Maximum [Member] | Eurodollar Advances [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.75%
Credit Agreement [Member] | Adjusted Base Rate [Member] | Minimum [Member] | Adjusted Base Rate Advances [Member] | Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.50%
Credit Agreement [Member] | Adjusted Base Rate [Member] | Minimum [Member] | Adjusted Base Rate Advances [Member] | Eurodollar Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.00%

Commitments And Contingencies -

Commitments And Contingencies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Loss Contingencies [Line Items]
Notes payable, fair value disclosure	$ 779,000
Interest rate swap principal		$ 200,000
Derivative, Variable Interest Rate		2.823%
Foreign Currency Transaction Gain (Loss), before Tax	(1,900)	$ (7,100)
Proceeds from Sale of Debt Securities, Available-for-sale	2,361	0
Investments, fair value disclosure	9,200		$ 10,000
Debt Securities, Available-for-sale, Realized Gain	300
Debt Securities, Available-for-sale, Unrealized Gain	1,100
Accounts Receivable And Contract Assets Contingency	51,000
Angolan bonds	9,164		10,179
Bonds
Loss Contingencies [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale	2,400
Angolan bonds			10,000
Brazil, Brazil Real
Loss Contingencies [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	(100)	(4,000)
Angola, Kwanza [Member]
Loss Contingencies [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	(1,400)	1,900
Cash and cash equivalents	$ 3,300		$ 4,700
Senior Notes due 2024 [Member]
Loss Contingencies [Line Items]
Derivative Liability, Notional Amount		$ 100,000
Senior Notes due 2024 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Derivative, Variable Interest Rate		2.426%

Earnings (Loss) Per Share, St_2

Earnings (Loss) Per Share, Stock-Based Compensation and Share Repurchase Plan (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2015	Dec. 31, 2020	Dec. 31, 2014
Shareholders' Equity, Earnings Per Share And Stock-Based Compensation [Line Items]
Number outstanding (in shares)	2,747,341		1,955,346
Number of shares authorized to be repurchased (in shares)				10,000,000
Total number of shares repurchased to date (in shares)		2,000,000
Treasury Stock, Value, Acquired, Cost Method		$ 100
Restricted Stock Units (RSUs) [Member]
Shareholders' Equity, Earnings Per Share And Stock-Based Compensation [Line Items]
Compensation cost not yet recognized	$ 20,000,000
Restricted Stock Units (RSUs) [Member] | Maximum [Member]
Shareholders' Equity, Earnings Per Share And Stock-Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award	three years
Award vesting period	3 years

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Document Period End Date	Mar. 31, 2021
Unrecognized Tax Benefits/Expense, Probability Threshold of Realizing for Tax Benefits/Expense Recognition, Minimum Percentage	50.00%
Proceeds from Income Tax Refunds		$ 5.6
Liability for Uncertainty in Income Taxes, Noncurrent	$ 14,000,000	$ 15,000,000
Income Taxes Receivable	33
Noncash Income Tax Benefit	$ 8.4

Income Taxes - Summary Of Earli

Income Taxes - Summary Of Earliest Tax Years Open To Examination (Details)	3 Months Ended
	Mar. 31, 2021
United States [Member]
Income Tax Examination [Line Items]
Earliest tax years open to examination by tax authorities	2014
United Kingdom [Member]
Income Tax Examination [Line Items]
Earliest tax years open to examination by tax authorities	2019
Norway [Member]
Income Tax Examination [Line Items]
Earliest tax years open to examination by tax authorities	2016
Angola [Member]
Income Tax Examination [Line Items]
Earliest tax years open to examination by tax authorities	2013
Brazil [Member]
Income Tax Examination [Line Items]
Earliest tax years open to examination by tax authorities	2016
AUSTRALIA
Income Tax Examination [Line Items]
Earliest tax years open to examination by tax authorities	2015

Business Segment Information -

Business Segment Information - Financial Data By Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Segment Reporting Information [Line Items]
Goodwill	$ 35,065	$ 35,016
Write-off Equipment and Intangibles		9,600	$ 7,300
Goodwill, Impairment Loss	$ 0		303,005
Document Period End Date	Mar. 31, 2021
Other adjustments to Income from continuing operations	$ 1,308	(2,176)	6,630
Total adjustments to Income from continuing operations	1,308	9,077	385,726
Impairment property plant equipment			68,763
Depreciation	35,000	46,000	43,000
Revenue	437,553	424,262	536,668
Income (Loss) from Operations	13,783	480	(380,757)
Depreciation and amortization, including goodwill impairment	36,471	46,450	356,196
Amortization of Intangible Assets	1,300	1,000	2,600
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss		9,571	7,328
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization, including goodwill impairment	36,471	46,450	356,196
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss		9,571	7,328
Goodwill, Impairment Loss	0		303,005
Other adjustments to Income from continuing operations	1,308	(2,176)	6,630
Total adjustments to Income from continuing operations	1,308	9,077	385,726
Depreciation	35,000	46,000	43,000
Amortization of Intangible Assets	1,300	1,000	2,600
Impairment of Long-Lived Assets Held-for-use		1,682	68,763
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	2,003,524	2,045,842
Property, Plant and Equipment, Net	561,650	591,107
Goodwill	35,065	35,016
Income (Loss) from Operations	13,783	480	(380,757)
Advanced Technologies [Member]
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss			11,388
Segment Reporting, Other Significant Reconciling Item [Line Items]
Goodwill, Impairment Loss			11,388
Subsea Robotics Member
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss			102,118
Other adjustments to Income from continuing operations	395	221	919
Total adjustments to Income from continuing operations	395	221	110,365
Revenue	119,119	114,711	139,770
Income (Loss) from Operations	14,619	14,477	(94,083)
Depreciation and amortization, including goodwill impairment	22,952	23,210	139,187
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss			7,328
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization, including goodwill impairment	22,952	23,210	139,187
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss			7,328
Goodwill, Impairment Loss			102,118
Other adjustments to Income from continuing operations	395	221	919
Total adjustments to Income from continuing operations	395	221	110,365
Segment Reporting, Asset Reconciling Item [Line Items]
Income (Loss) from Operations	14,619	14,477	(94,083)
Manufactured Products Member
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss			11,388
Other adjustments to Income from continuing operations	537	(3,489)	1,984
Total adjustments to Income from continuing operations	537	(3,489)	74,446
Revenue	86,825	99,899	166,534
Income (Loss) from Operations	2,753	12,218	(66,138)
Depreciation and amortization, including goodwill impairment	3,227	3,193	15,964
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization, including goodwill impairment	3,227	3,193	15,964
Goodwill, Impairment Loss			11,388
Other adjustments to Income from continuing operations	537	(3,489)	1,984
Total adjustments to Income from continuing operations	537	(3,489)	74,446
Impairment of Long-Lived Assets Held-for-use			61,074
Segment Reporting, Asset Reconciling Item [Line Items]
Income (Loss) from Operations	2,753	12,218	(66,138)
Offshore Projects Group
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss			66,285
Other adjustments to Income from continuing operations	149	643	1,216
Total adjustments to Income from continuing operations	149	11,348	75,023
Revenue	89,234	67,821	74,254
Income (Loss) from Operations	8,813	(9,940)	(79,323)
Depreciation and amortization, including goodwill impairment	7,125	16,979	74,907
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss		9,401
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization, including goodwill impairment	7,125	16,979	74,907
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss		9,401
Goodwill, Impairment Loss			66,285
Other adjustments to Income from continuing operations	149	643	1,216
Total adjustments to Income from continuing operations	149	11,348	75,023
Impairment of Long-Lived Assets Held-for-use		1,304	7,522
Segment Reporting, Asset Reconciling Item [Line Items]
Income (Loss) from Operations	8,813	(9,940)	(79,323)
Integrity Managements & Digital Solutions Member
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss			123,214
Other adjustments to Income from continuing operations	217	422	2,231
Total adjustments to Income from continuing operations	217	970	125,612
Revenue	54,048	54,307	64,729
Income (Loss) from Operations	2,474	892	(121,535)
Depreciation and amortization, including goodwill impairment	1,124	1,255	124,343
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss		170
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization, including goodwill impairment	1,124	1,255	124,343
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss		170
Goodwill, Impairment Loss			123,214
Other adjustments to Income from continuing operations	217	422	2,231
Total adjustments to Income from continuing operations	217	970	125,612
Impairment of Long-Lived Assets Held-for-use		378	167
Segment Reporting, Asset Reconciling Item [Line Items]
Income (Loss) from Operations	2,474	892	(121,535)
Aerospace and Defense Technologies Member
Segment Reporting Information [Line Items]
Other adjustments to Income from continuing operations	10	27
Total adjustments to Income from continuing operations	10	27	0
Revenue	88,327	87,524	91,381
Income (Loss) from Operations	16,839	16,525	12,971
Depreciation and amortization, including goodwill impairment	1,276	667	687
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization, including goodwill impairment	1,276	667	687
Other adjustments to Income from continuing operations	10	27
Total adjustments to Income from continuing operations	10	27	0
Segment Reporting, Asset Reconciling Item [Line Items]
Income (Loss) from Operations	16,839	16,525	12,971
Energy Services and Products Member
Segment Reporting Information [Line Items]
Revenue	349,226	336,738	445,287
Income (Loss) from Operations	28,659	17,647	(361,079)
Depreciation and amortization, including goodwill impairment	34,428	44,637	354,401
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization, including goodwill impairment	34,428	44,637	354,401
Segment Reporting, Asset Reconciling Item [Line Items]
Income (Loss) from Operations	28,659	17,647	(361,079)
Unallocated Expenses [Member]
Segment Reporting Information [Line Items]
Total adjustments to Income from continuing operations		0
Income (Loss) from Operations	(31,715)	(33,692)	(32,649)
Depreciation and amortization, including goodwill impairment	767	1,146	1,108
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization, including goodwill impairment	767	1,146	1,108
Total adjustments to Income from continuing operations		0
Segment Reporting, Asset Reconciling Item [Line Items]
Income (Loss) from Operations	$ (31,715)	$ (33,692)	(32,649)
Unallocated Expense Member
Segment Reporting Information [Line Items]
Other adjustments to Income from continuing operations			280
Total adjustments to Income from continuing operations			280
Segment Reporting, Other Significant Reconciling Item [Line Items]
Other adjustments to Income from continuing operations			280
Total adjustments to Income from continuing operations			$ 280

Allowance for Credit Losses (De

Allowance for Credit Losses (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Interest Receivable	$ 1,300
Financing Receivable, Allowance for Credit Loss	600
Financing Receivable, Allowance for Credit Loss	600
Accounts Receivable [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 2,400

Intangible Assets, Goodwill a_3

Intangible Assets, Goodwill and Other (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Mar. 31, 2020USD ($)units
Finite-Lived Intangible Assets [Line Items]
Impairment property plant equipment			$ 68,763
Impairment of Long-Lived Assets Held-for-use		$ 1,682	68,763
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 0		303,005
SDS Rosyth [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use			6,543
SDS Brazil [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment property plant equipment			9,834
Subsea Products Angola [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment property plant equipment			38,482
Shallow Water [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment property plant equipment			3,894
Ecosse [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment property plant equipment			3,628
Global Data Solution [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment property plant equipment			167
Oceaneering Entertainment System [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment property plant equipment			5,065
Oceaneering AGV System [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment property plant equipment			1,150
Manufactured Products Member
Finite-Lived Intangible Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use			61,074
Offshore Projects Group
Finite-Lived Intangible Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use			7,522
Integrity Managements & Digital Solutions Member
Finite-Lived Intangible Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use			$ 167
Weighted Average [Member]
Finite-Lived Intangible Assets [Line Items]
Alternative Investment, Measurement Input | units			0.12
Goodwill [Line Items]
Alternative Investment, Measurement Input | units			0.12
Measurement Input, Long-term Revenue Growth Rate [Member]
Finite-Lived Intangible Assets [Line Items]
Alternative Investment, Measurement Input | units			0.02
Goodwill [Line Items]
Alternative Investment, Measurement Input | units			0.02
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Alternative Investment, Measurement Input | units			0.11
Goodwill [Line Items]
Alternative Investment, Measurement Input | units			0.11
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Alternative Investment, Measurement Input | units			0.15
Goodwill [Line Items]
Alternative Investment, Measurement Input | units			0.15
Manufactured Products Member
Finite-Lived Intangible Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use			$ 61,074
Goodwill [Line Items]
Goodwill, Impairment Loss			11,388
Offshore Projects Group
Finite-Lived Intangible Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use		1,304	7,522
Goodwill [Line Items]
Goodwill, Impairment Loss			66,285
Integrity Managements & Digital Solutions Member
Finite-Lived Intangible Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use		$ 378	167
Goodwill [Line Items]
Goodwill, Impairment Loss			123,214
Subsea Products [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss			51,302
Subsea Projects [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss			129,562
Asset Integrity [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss			110,753
Subsea Robotics Member
Goodwill [Line Items]
Goodwill, Impairment Loss			102,118
Advanced Technologies [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss			$ 11,388