Revenue Performance Obligations (Details) $ in Millions	Dec. 31, 2018 USD ($)
Revenue [Abstract]
Revenue, Remaining Performance Obligation	$ 292
Revenue Recognition for Remaining Performance Obligations	$ 229

Revenue to be recognized for the remaining performance obligations over next 12 months

No definition available.

Name:	oii_RevenueRecognitionforRemainingPerformanceObligations
Namespace Prefix:	oii_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant