Summary Of Major Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jan. 01, 2020	Jan. 01, 2019
Property, Plant and Equipment [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets							$ (2,273,000)	$ (5,860,000)
Right-of-use asset impairment		$ 16,708,000
Impairment property plant equipment		51,578,000
Intangible Assets Impairments		477,000
Impairment of Long-Lived Assets Held-for-use	$ 0	68,763,000				$ 0
Present Value of Lease Liabilities								191,000,000
Right-of-use operating lease assets	144,933,000		$ 163,238,000		$ 144,933,000			185,000,000
Goodwill, Impairment Loss	0		$ 15,000,000	$ 0	303,005,000	0
Interest costs capitalized	$ 0			$ 1,400,000	$ 0	$ 3,400,000
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%
Retained Earnings [Member]
Property, Plant and Equipment [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets								(5,860,000)
Accounting Standards Update 2016-02 [Member] | Retained Earnings [Member]
Property, Plant and Equipment [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets								$ 5,900,000
Shallow Water [Member]
Property, Plant and Equipment [Line Items]
Right-of-use asset impairment					$ 0
Impairment property plant equipment		3,894,000
Intangible Assets Impairments		0
Impairment of Long-Lived Assets Held-for-use		3,894,000
Oceaneering Entertainment System [Member]
Property, Plant and Equipment [Line Items]
Right-of-use asset impairment		3,472,000
Impairment property plant equipment		1,593,000
Impairment of Long-Lived Assets Held-for-use		5,065,000
Ecosse [Member]
Property, Plant and Equipment [Line Items]
Right-of-use asset impairment					$ 0
Impairment property plant equipment		3,628,000
Intangible Assets Impairments		0
Impairment of Long-Lived Assets Held-for-use		3,628,000
Oceaneering AGV System [Member]
Property, Plant and Equipment [Line Items]
Right-of-use asset impairment		695,000
Impairment property plant equipment		145,000
Intangible Assets Impairments		310,000
Impairment of Long-Lived Assets Held-for-use		1,150,000
SDS Rosyth [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment		6,543,000
Impairment of Long-Lived Assets Held-for-use		6,543,000
Global Data Solution [Member]
Property, Plant and Equipment [Line Items]
Intangible Assets Impairments		167,000
Impairment of Long-Lived Assets Held-for-use		167,000
SDS Brazil [Member]
Property, Plant and Equipment [Line Items]
Impairment property plant equipment		9,834,000
Impairment of Long-Lived Assets Held-for-use		9,834,000
Subsea Products Angola [Member]
Property, Plant and Equipment [Line Items]
Right-of-use asset impairment		12,541,000
Impairment property plant equipment		25,941,000
Impairment of Long-Lived Assets Held-for-use		$ 38,482,000
Property Subject to Operating Lease [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Operating Leases, Operating Lease Term					15 years