SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES | Apache Offshore Investment Partnership, a Delaware general partnership (the Investment Partnership), was formed on October 31, 1983, consisting of Apache Corporation, a Delaware corporation (Apache or the Managing Partner), as Managing Partner and public investors (the Investing Partners). The Investment Partnership invested its entire capital in Apache Offshore Petroleum Limited Partnership, a Delaware limited partnership (the Operating Partnership). The primary business of the Investment Partnership is to serve as the sole limited partner of the Operating Partnership. The accompanying financial statements include the accounts of both the Investment Partnership and the Operating Partnership. The term “Partnership,” as used herein, refers to the Investment Partnership or the Operating Partnership, as the case may be. These financial statements have been prepared by the Partnership, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). They reflect all adjustments that are, in the opinion of management, necessary for a fair statement of the results for the interim periods, on a basis consistent with the annual audited financial statements. Certain information, accounting policies, and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP) have been omitted pursuant to such rules and regulations, although the Partnership believes that the disclosures are adequate to make the information presented not misleading. These financial statements should be read in conjunction with the Partnership’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019 , which contains a summary of the Partnership’s significant accounting policies and other disclosures. As of June 30, 2020 , the Partnership’s significant accounting policies are consistent with those discussed in Note 2 of its consolidated financial statements contained in the Annual Report on Form 10-K for the fiscal year ended December 31, 2019 . Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates with regard to these financial statements include the estimate of proved oil and gas reserve quantities and the related present value of estimated future net cash flows therefrom and the assessment of asset retirement obligations. Actual results could differ from those estimates. Oil and Gas Property The Partnership follows the full-cost method of accounting for its oil and gas property. Under this method of accounting, all costs incurred for both successful and unsuccessful exploration and development activities, and oil and gas property acquisitions are capitalized. The net book value of oil and gas properties may not exceed a calculated “ceiling.” The ceiling limitation is the estimated future net cash flows from proved oil and gas reserves, discounted at 10 percent per annum. Estimated future net cash flows are calculated using end-of-period costs and an unweighted arithmetic average of commodity prices in effect on the first day of each of the previous 12 months, held flat for the life of the production, except where prices are defined by contractual arrangements. For a discussion of the calculation of estimated future net cash flows, please refer to Note 10—Supplemental Oil and Gas Disclosures (Unaudited) to the consolidated financial statements contained in the Partnership’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019 . Any excess of the net book value of proved oil and gas properties over the ceiling is charged to expense and reflected as “Additional depreciation, depletion and amortization” in the accompanying statement of consolidated operations. Such limitations are tested quarterly. The Partnership had no write-downs of the carrying value of its proved oil and gas properties during the first six months of 2020 and 2019 . Revenue Recognition There have been no significant changes to the Partnership’s contracts with customers during the six months ended June 30, 2020 . The Partnership generates revenue from its contracts with customers from the sale of its crude oil, natural gas, and NGL production volumes. Under these short-term commodity sales contracts, the physical delivery of each unit of quantity represents a single, distinct performance obligation on behalf of the Partnership. Contract prices are determined based on market-indexed prices, adjusted for quality, transportation, and other market-reflective differentials. Revenue is measured by allocating an entirely variable market price to each performance obligation and recognized at a point in time when control is transferred to the customer. The Partnership considers a variety of facts and circumstances in assessing the point of control transfer, including but not limited to whether the purchaser can direct the use of the hydrocarbons, the transfer of significant risks and rewards, and the Partnership’s right to payment. Control typically transfers to customers upon the physical delivery at specified locations within each contract and the transfer of title. The table below presents revenues from contracts with customers disaggregated by product type for the quarters and six months ended June 30, 2020 and 2019 : For the Quarter Ended June 30, For the Six Months Ended June 30, 2020 2019 2020 2019 Oil $ 78,665 $ 272,263 $ 283,133 $ 535,146 Gas 12,958 22,297 34,416 53,858 NGLs 1,448 7,467 7,016 12,534 Total Oil and Gas Revenue $ 93,071 $ 302,027 $ 324,565 $ 601,538 In accordance with the provisions of Accounting Standards Codification 606, variable market prices for each short-term commodity sale are allocated entirely to each performance obligation as the terms of payment relate specifically to the Partnership’s efforts to satisfy its obligations. As such, the Partnership has elected the practical expedients available under the standard to not disclose the aggregate transaction price allocated to unsatisfied, or partially unsatisfied, performance obligations as of the end of the reporting period. Payment terms under all contracts with customers are typically due and received within a short-term period of one year or less, after physical delivery of the product or service has been rendered. The Partnership records trade accounts receivable for its unconditional rights to consideration arising under sales contracts with customers. The carrying value of such receivables represents estimated net realizable value. The Partnership routinely assesses the collectability of all material trade and other receivables. The Partnership accrues a reserve on a receivable when, based on the judgment of management, it is probable that a receivable will not be collected and the amount of any reserve may be reasonably estimated. As of June 30, 2020 , the carrying amounts of trade accounts receivables approximate fair value because of the short-term nature of these instruments. Receivables from contracts with customers totaled $66,913 and $108,693 as of June 30, 2020 and December 31, 2019 , respectively. The Partnership had no allowance for doubtful accounts recorded for any comparative period presented. |