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Commitments And Contingencies - Narrative (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Loss Contingencies [Line Items]    
Letters of Credit Outstanding, Amount $ 70,000,000us-gaap_LettersOfCreditOutstandingAmount $ 45,000,000us-gaap_LettersOfCreditOutstandingAmount
Allowance for Doubtful Accounts Receivable, Current 137,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 2,298,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Collectibility of Receivables [Member] | Brazil [Member]    
Loss Contingencies [Line Items]    
Accounts receivable, overdue   4,100,000us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_CollectibilityOfReceivablesMember
/ us-gaap_MajorCustomersAxis
= oii_BrazilMember
Allowance for Doubtful Accounts Receivable, Current   $ 3,300,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_CollectibilityOfReceivablesMember
/ us-gaap_MajorCustomersAxis
= oii_BrazilMember