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Summary Of Major Accounting Policies - Principles of Consolidation And Repurchases (Details)
Mar. 31, 2015
Minimum [Member]  
Schedule of Equity Method Investments [Line Items]  
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Percentage 50.00%oii_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestThreholdForConsolidationPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Equity Method Investment, Ownership Interest Threshold For Consolidation, Percentage 20.00%oii_EquityMethodInvestmentOwnershipInterestThresholdForConsolidationPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]  
Schedule of Equity Method Investments [Line Items]  
Equity Method Investment, Ownership Interest Threshold For Consolidation, Percentage 50.00%oii_EquityMethodInvestmentOwnershipInterestThresholdForConsolidationPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember