Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 304,512	$ 430,714
Accounts receivable, net of allowances for doubtful accounts	774,905us-gaap_AccountsReceivableNetCurrent	778,372us-gaap_AccountsReceivableNetCurrent
Inventory	379,836us-gaap_InventoryNet	375,588us-gaap_InventoryNet
Other current assets	150,458us-gaap_OtherAssetsCurrent	128,876us-gaap_OtherAssetsCurrent
Total Current Assets	1,609,711us-gaap_AssetsCurrent	1,713,550us-gaap_AssetsCurrent
Property and Equipment, at cost	2,653,250us-gaap_PropertyPlantAndEquipmentGross	2,660,788us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation	1,380,840	1,354,966
Net Property and Equipment	1,272,410us-gaap_PropertyPlantAndEquipmentNet	1,305,822us-gaap_PropertyPlantAndEquipmentNet
Other Assets:
Goodwill	314,799us-gaap_Goodwill	331,474us-gaap_Goodwill
Investments in unconsolidated affiliates	31,310us-gaap_EquityMethodInvestments	32,624us-gaap_EquityMethodInvestments
Other non-current assets	125,713us-gaap_OtherAssetsNoncurrent	128,231us-gaap_OtherAssetsNoncurrent
Total Other Assets	471,822oii_TotalOtherAssets	492,329oii_TotalOtherAssets
Total Assets	3,353,943us-gaap_Assets	3,511,701us-gaap_Assets
Current Liabilities:
Accounts payable	121,087us-gaap_AccountsPayableCurrent	123,688us-gaap_AccountsPayableCurrent
Accrued liabilities	431,131us-gaap_AccruedLiabilitiesCurrent	490,260us-gaap_AccruedLiabilitiesCurrent
Income taxes payable	49,624us-gaap_AccruedIncomeTaxesCurrent	65,189us-gaap_AccruedIncomeTaxesCurrent
Total Current Liabilities	601,842us-gaap_LiabilitiesCurrent	679,137us-gaap_LiabilitiesCurrent
Long-term Debt	750,000us-gaap_LongTermDebtNoncurrent	750,000us-gaap_LongTermDebtNoncurrent
Other Long-term Liabilities	418,429us-gaap_OtherLiabilitiesNoncurrent	424,944us-gaap_OtherLiabilitiesNoncurrent
Commitments and Contingencies
Stockholders' Equity:
Common Stock	27,709us-gaap_CommonStockValue	27,709us-gaap_CommonStockValue
Additional paid-in capital	216,258	229,640
Treasury stock, at cost	(699,457)us-gaap_TreasuryStockValue	(656,917)us-gaap_TreasuryStockValue
Retained earnings	2,282,771	2,240,229
Accumulated other comprehensive income	(243,609)	(183,041)
Total Shareholders' Equity	1,583,672us-gaap_StockholdersEquity	1,657,620us-gaap_StockholdersEquity
Total Liabilities and Sharesholders' Equity	$ 3,353,943	$ 3,511,701

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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