2.4.0.8117 - Disclosure - Subsequent Event - Additional Information (Detail)truefalsefalse1false falsefalseeol_PE23789---1310-Q0005_STD_181_20130630_0http://www.sec.gov/CIK0000727538duration2013-01-01T00:00:002013-06-30T00:00:001true 1us-gaap_SubsequentEventsAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Subsequent Events [Abstract]2false 2aoip_AssetDivestitureByAffiliateDateOfDivestitureAgreementaoip_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse002013-07-18falsefalsetruexbrli:dateItemTypedateAsset divestiture by affiliate date of divestiture agreement.No definition available.false0Date of definitive agreement3false 2aoip_AssetDivestitureByAffiliatePlannedDivestitureActivitiesDescriptionaoip_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00On July 18, 2013, Apache, the Partnership's Managing Partner, announced it had entered into a definitive agreement to sell its Gulf of Mexico Shelf operations and properties to Fieldwood Energy LLC (Fieldwood), an affiliate of Riverstone Holdings. The effective date of the sale is July 1, 2013, and the transaction is expected to close on September 30, 2013, subject to customary regulatory approvals and other closing conditions.falsefalsefalsexbrli:stringItemTypestringAsset divestiture by affiliate planned divestiture activities description.No definition available.false0Subsequent event descriptionfalseSubsequent Event - Additional Information (Detail)UnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.apachecorp.com/taxonomy/role/DisclosureSubsequentEventAdditionalInformation13