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STATEMENT OF CONSOLIDATED OPERATIONS (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
REVENUES:
Oil and gas sales	$ 231,494	$ 299,511
Interest income	18,072	27,858
Total Revenues	249,566	327,369
EXPENSES:
Depreciation, depletion and amortization	64,388	71,013
Asset retirement obligation accretion	11,836	19,451
Lease operating expenses	107,896	115,607
Gathering and transportation costs	4,969	4,770
Administrative	82,134	82,134
Total Expenses	271,223	292,975
NET INCOME (LOSS)	(21,657)	34,394
NET INCOME (LOSS) ALLOCATED TO:
Managing Partner	3,796	15,516
Investing Partners	(25,453)	18,878
NET INCOME (LOSS)	$ (21,657)	$ 34,394
NET INCOMEL(OSS) PER INVESTING PARTNER UNIT (in USD per share)	$ (25)	$ 18
WEIGHTED AVERAGE INVESTING PARTNER UNITS OUTSTANDING (in shares)	1,021.5	1,021.5

CONSOLIDATED BALANCE SHEET (Unaudited) (Parenthetical) - shares	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Investing Partners, units outstanding	1,021.5	1,021.5

RECEIVABLE FROM / PAYABLE TO APACHE CORPORATION	3 Months Ended
RECEIVABLE FROM / PAYABLE TO APACHE CORPORATION	Mar. 31, 2020
Related Party Transactions [Abstract]
RECEIVABLE FROM / PAYABLE TO APACHE CORPORATION	RECEIVABLE FROM / PAYABLE TO APACHE CORPORATION The receivable from/payable to Apache represents the net result of the Investing Partners’ revenue received and expenditures paid in the current month. Generally, cash in this amount will be paid by Apache to the Partnership or transferred to Apache in the month after the Partnership’s transactions are processed and the net results of operations are determined.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Accounting Policies [Abstract]
Impairment of oil and gas properties	$ 0	$ 0
Disaggregation of Revenue [Line Items]
Oil and gas sales	231,494	299,511
Receivables from contracts with customers	62,920		$ 108,693
Allowance for doubtful accounts	0		$ 0
Oil
Disaggregation of Revenue [Line Items]
Oil and gas sales	204,469	262,883
Gas
Disaggregation of Revenue [Line Items]
Oil and gas sales	21,457	31,561
NGLs
Disaggregation of Revenue [Line Items]
Oil and gas sales	$ 5,568	$ 5,067

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

3 Months Ended

Mar. 31, 2020

Accounting Policies [Abstract]

Disaggregation of Revenue

For the three month periods ended March 31, 2020 and 2019, revenues from customers totaled $231,494 and $299,511, respectively, which is disaggregated by product type in the table below:



	For the Three Months Ended March 31,
	2020		2019
Oil	$	204,469	$	262,883
Gas	21,457		31,561
NGLs	5,568		5,067
Total Oil and Gas Revenue	$	231,494	$	299,511

ASSET RETIREMENT OBLIGATIONS (Tables)

3 Months Ended

Mar. 31, 2020

Asset Retirement Obligation Disclosure [Abstract]

Changes to Partnership's Asset Retirement Obligation Liability

The following table describes the changes to the Partnership’s asset retirement obligation liability for the first three months of 2020:



Asset retirement obligation at December 31, 2019	$	1,421,282
Accretion expense	11,836
Liabilities settled	(216,682		)
Revisions in estimated liabilities	235,720
Asset retirement obligation at March 31, 2020	1,452,156
Less current portion	(634,931		)
Asset retirement obligation, long-term	$	817,225

Cover	3 Months Ended
Cover	Mar. 31, 2020 shares
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	0-13546
Entity Registrant Name	APACHE OFFSHORE INVESTMENT PARTNERSHIP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	41-1464066
Entity Address, Address Line One	One Post Oak Central, 2000 Post Oak Boulevard, Suite 100
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77056-4400
City Area Code	713
Local Phone Number	296-6000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Emerging Growth Company	false
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	1,022
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Central Index Key	0000727538
Current Fiscal Year End Date	--12-31

STATEMENT OF CONSOLIDATED CASH FLOWS (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (21,657)	$ 34,394
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	64,388	71,013
Asset retirement obligation accretion	11,836	19,451
Changes in operating assets and liabilities:
Accrued receivables	45,773	6,448
Receivable from/payable to Apache Corporation	(1,538)	543
Accrued operating expenses	0	(14,414)
Asset retirement obligations	(293,092)	(127,416)
Net cash used in operating activities	(194,290)	(9,981)
CASH FLOWS FROM FINANCING ACTIVITIES:
Contributions from (distributions to) Managing Partner	12,855	(5,066)
Net cash provided by (used in) financing activities	12,855	(5,066)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(181,435)	(15,047)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	5,020,432	5,103,336
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 4,838,997	$ 5,088,289

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

3 Months Ended

Mar. 31, 2020

Accounting Policies [Abstract]

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.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

As of March 31, 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 three months of 2020 and 2019.

Revenue Recognition

There have been no significant changes to the Partnership’s contracts with customers during the three months ended March 31, 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.

For the three month periods ended March 31, 2020 and 2019, revenues from customers totaled $231,494 and $299,511, respectively, which is disaggregated by product type in the table below:



	For the Three Months Ended March 31,
	2020		2019
Oil	$	204,469	$	262,883
Gas	21,457		31,561
NGLs	5,568		5,067
Total Oil and Gas Revenue	$	231,494	$	299,511

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 March 31, 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 $62,920 and $108,693 as of March 31, 2020 and December 31, 2019, respectively. The Partnership had no allowance for doubtful accounts recorded for any comparative period presented.

NOTICE OF WITHDRAWAL AND RIGHT OF PRESENTMENT (Details)	Mar. 22, 2019
Partners' Capital [Abstract]
Notice of intention to withdrawal, notice period	120 days

ASSET RETIREMENT OBLIGATIONS (Detail) - USD ($)	3 Months Ended
ASSET RETIREMENT OBLIGATIONS (Detail) - USD ($)	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligation, beginning balance	$ 1,421,282
Accretion expense	11,836	$ 19,451
Liabilities settled	(216,682)
Revisions in estimated liabilities	235,720
Asset retirement obligation, ending balance	1,452,156
Less current portion	(634,931)		$ (614,493)
Asset retirement obligation, long-term	$ 817,225		$ 806,789

CONSOLIDATED BALANCE SHEET (Unaudited) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 4,838,997	$ 5,020,432
Accrued revenues receivable	62,920	108,693
Total Current Assets	4,901,917	5,129,125
OIL AND GAS PROPERTIES, on the basis of full cost accounting:
Proved properties	195,637,115	195,401,395
Less – Accumulated depreciation, depletion and amortization	191,523,603	191,459,215
Total oil and gas properties, on the basis of full cost accounting	4,113,512	3,942,180
Total Assets	9,015,429	9,071,305
CURRENT LIABILITIES:
Payable to Apache Corporation	6,051	7,589
Asset retirement obligation	634,931	614,493
Accrued operating expenses	77,000	77,000
Accrued development costs	0	76,410
Total Current Liabilities	717,982	775,492
ASSET RETIREMENT OBLIGATION	817,225	806,789
PARTNERS’ CAPITAL:
Managing Partner	508,259	491,608
Investing Partners (1,021.5 units outstanding)	6,971,963	6,997,416
Total Partners' Capital	7,480,222	7,489,024
Total liabilities and partners' capital	$ 9,015,429	$ 9,071,305

ASSET RETIREMENT OBLIGATIONS

3 Months Ended

Mar. 31, 2020

Asset Retirement Obligation Disclosure [Abstract]

ASSET RETIREMENT OBLIGATIONS

The following table describes the changes to the Partnership’s asset retirement obligation liability for the first three months of 2020:



Asset retirement obligation at December 31, 2019	$	1,421,282
Accretion expense	11,836
Liabilities settled	(216,682		)
Revisions in estimated liabilities	235,720
Asset retirement obligation at March 31, 2020	1,452,156
Less current portion	(634,931		)
Asset retirement obligation, long-term	$	817,225

Liabilities settled during the period relate to well abandonment activities at Ship Shoal 258/259. Estimated liabilities on this field were revised upward by an additional $235,720 during the period as a result of weather delays and unplanned infrastructure requirements to support the abandonment activities.

NOTICE OF WITHDRAWAL AND RIGHT OF PRESENTMENT	3 Months Ended
NOTICE OF WITHDRAWAL AND RIGHT OF PRESENTMENT	Mar. 31, 2020
Partners' Capital [Abstract]
NOTICE OF WITHDRAWAL AND RIGHT OF PRESENTMENT	NOTICE OF WITHDRAWAL AND RIGHT OF PRESENTMENT On March 22, 2019, Apache, as the Managing Partner of the Investment Partnership, gave notice of its intention to withdraw as Managing Partner of the Investment Partnership. The notice described the withdrawal process and certain notice periods required by that process. No party assumed the role of Managing Partner within the 120-day notice period specified by the notice of intention to withdraw. Consequently, Apache will oversee the process of winding up and liquidating the business and affairs of the Investment Partnership. Apache has not made a decision as to when it will complete the process to withdraw as Managing Partner. On April 26, 2019, the Managing Partner determined that, during the withdrawal and dissolution process, it would be inconsistent with the Managing Partner’s fiduciary duties to purchase (or to cause the Investment Partnership to purchase) outstanding units of partnership interests (Units) from the holders thereof pursuant to the right of presentment provided for in Sections 6.9 through 6.14 of the Partnership Agreement of the Investment Partnership (the Partnership Agreement). As a result of this determination by the Managing Partner, pursuant to Section 6.12 of the Partnership Agreement, the right of presentment has been terminated and Sections 6.9 through 6.14 have “become null and void and of no further force or effect” as provided in Section 6.12. The Investment Partnership has not made a repurchase under the right of presentment since 2008.

STATEMENT OF CONSOLIDATED CHANGES IN PARTNERS’ CAPITAL (Unaudited) Statement - USD ($)	Total	Investing Partners	Managing Partner
BALANCE BEGINNING at Dec. 31, 2018	$ 7,501,267	$ 7,037,081	$ 464,186
Managing Partner [Line Items]
Distributions	(5,066)	0	(5,066)
Net income	34,394	18,878	15,516
BALANCE ENDING at Mar. 31, 2019	7,530,595	7,055,959	474,636
BALANCE BEGINNING at Dec. 31, 2019	7,489,024	6,997,416	491,608
Managing Partner [Line Items]
Contributions	12,855	0	12,855
Net income	(21,657)	(25,453)	3,796
BALANCE ENDING at Mar. 31, 2020	$ 7,480,222	$ 6,971,963	$ 508,259

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

FAIR VALUE MEASUREMENTS	3 Months Ended
FAIR VALUE MEASUREMENTS	Mar. 31, 2020
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS Certain assets and liabilities are reported at fair value on a recurring basis in the Partnership’s consolidated balance sheet. As of March 31, 2020 and December 31, 2019, the carrying amounts of the Partnership’s current assets and current liabilities approximated fair value because of the short-term nature or maturity of these instruments. The Partnership did not use derivative financial instruments or otherwise engage in hedging activities during the three months ended March 31, 2020 and 2019.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Mar. 31, 2020
Accounting Policies [Abstract]
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.
Revenue Recognition	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. There have been no significant changes to the Partnership’s contracts with customers during the three months ended March 31, 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.