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Commitments And Contingencies - Narrative (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Loss Contingencies [Line Items]      
Loans Payable to Bank $ 250,000,000us-gaap_LoansPayableToBank $ 250,000,000us-gaap_LoansPayableToBank  
Cash Flow Hedge Derivative Instrument Assets at Fair Value 3,100,000us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue    
Line of Credit Facility, Amount Outstanding 0us-gaap_LineOfCredit 0us-gaap_LineOfCredit  
Brazil [Member] | Collectibility of Receivables [Member]      
Loss Contingencies [Line Items]      
Accounts Receivable, Gross, Current     $ 3,300,000us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_CollectibilityOfReceivablesMember
/ us-gaap_MajorCustomersAxis
= oii_BrazilMember