Summary Of Major Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jan. 01, 2020	Dec. 31, 2019	Jan. 01, 2019
Property, Plant and Equipment [Line Items]
Impairment property plant equipment		$ 68,763,000
Impairment of Long-Lived Assets Held-for-use	$ 0	68,763,000		$ 68,763,000	$ 0
Present Value of Lease Liabilities								$ 191,000,000
Right-of-use operating lease assets	139,715,000			139,715,000			$ 163,238,000	$ 185,000,000
Goodwill, Impairment Loss	40,875,000	303,005,000	$ 0	343,880,000	0
Interest costs capitalized	0		$ 1,400,000	0	$ 3,400,000
Accounts Receivable, Allowance for Credit Loss						$ 2,300,000	$ 7,500,000
Interest Receivable	1,600,000			1,600,000
Accounts Receivable [Member]
Property, Plant and Equipment [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff				5,300,000
Financing Receivable, Allowance for Credit Loss	$ 9,200,000			9,200,000
Financing Receivable, Allowance for Credit Loss, Writeoff				$ 5,300,000
Maximum [Member]
Property, Plant and Equipment [Line Items]
Equity Method Investment, Ownership Percentage	50.00%			50.00%
Minimum [Member]
Property, Plant and Equipment [Line Items]
Threshold for consolidation, percentage	50.00%			50.00%
Equity Method Investment, Ownership Percentage	20.00%			20.00%
Shallow Water [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment		3,894,000
Oceaneering Entertainment System [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment		5,065,000
Ecosse [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment		3,628,000
Oceaneering AGV System [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment		1,150,000
SDS Rosyth [Member]
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets Held-for-use		6,543,000
Global Data Solution [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment		167,000
SDS Brazil [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment		9,834,000
Subsea Products Angola [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment		$ 38,482,000
Property Subject to Operating Lease [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Operating Leases, Operating Lease Term				15 years