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Operations by Business Segment and Geographic Area - Narrative (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Segment Reporting, Disclosure of Major Customers 0.1824775925 0.1766497243 0.129500281
Equity Method Investment, Significant Property, Plant and Equipment Owned by Equity Method Investee 75.00%oii_EquityMethodInvestmentSignificantPropertyPlantAndEquipmentOwnedByEquityMethodInvestee    
Medusa Spar LLC Investment [Member]      
Segment Reporting Information [Line Items]      
Equity Method Investment, Ownership Percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= oii_MedusaSparLlcInvestmentMember		    
Equity Method Investment, Significant Property, Plant and Equipment Owned by Equity Method Investee 75.00%oii_EquityMethodInvestmentSignificantPropertyPlantAndEquipmentOwnedByEquityMethodInvestee
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= oii_MedusaSparLlcInvestmentMember		    
Sales [Member] | Customer Concentration Risk [Member]      
Segment Reporting Information [Line Items]      
Major Customer Above Benchmark Threshold, Number 1oii_MajorCustomerAboveBenchmarkThresholdNumber
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember		 1oii_MajorCustomerAboveBenchmarkThresholdNumber
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember		 1oii_MajorCustomerAboveBenchmarkThresholdNumber
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember