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Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 31, 2016 shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Trading Symbol	AOIP
Entity Registrant Name	APACHE OFFSHORE INVESTMENT PARTNERSHIP
Entity Central Index Key	0000727538
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding	1,022

Statement of Consolidated Operations - USD ($)	3 Months Ended
Statement of Consolidated Operations - USD ($)	Mar. 31, 2016	Mar. 31, 2015
REVENUES:
Oil and gas sales	$ 313,852	$ 482,163
Interest income	1,030	0
Total Revenues	314,882	482,163
EXPENSES:
Depreciation, depletion and amortization	1,407,970	105,338
Asset retirement obligation accretion	19,482	32,031
Lease operating expenses	159,571	254,334
Gathering and transportation costs	47,938	29,231
Administrative	87,000	92,500
Total Expenses	1,721,961	513,434
Net income (loss)	(1,407,079)	(31,271)
NET INCOME (LOSS) ALLOCATED TO:
Managing Partner	(2,765)	14,627
Investing Partners	(1,404,314)	(45,898)
Net income (loss)	$ (1,407,079)	$ (31,271)
NET INCOME (LOSS) PER INVESTING PARTNER UNIT (in USD per share)	$ (1,375)	$ (45)
WEIGHTED AVERAGE INVESTING PARTNER UNITS OUTSTANDING (in shares)	1,021.5	1,021.5
Recurring
EXPENSES:
Depreciation, depletion and amortization	$ 136,085	$ 105,338
Additional
EXPENSES:
Depreciation, depletion and amortization	$ 1,271,885	$ 0

Statement of Consolidated Cash Flows - USD ($)	3 Months Ended
Statement of Consolidated Cash Flows - USD ($)	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (1,407,079)	$ (31,271)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	1,407,970	105,338
Asset retirement obligation accretion	19,482	32,031
Changes in operating assets and liabilities:
(Increase) decrease in accrued receivables	(31,959)	59,896
Increase (decrease) in receivable from/payable to Apache Corporation	38,505	8,201
Increase (decrease) in accrued operating expenses	(76,812)	(17,424)
Increase (decrease) in asset retirement obligations	(228,118)	0
Net cash (used in) provided by operating activities	(278,011)	156,771
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to oil and gas properties	0	(12,284)
Net cash used in investing activities	0	(12,284)
CASH FLOWS FROM FINANCING ACTIVITIES:
Contributions from Managing Partner	40,697	0
Distributions to Managing Partner	0	(29,585)
Net cash provided by (used in) financing activities	40,697	(29,585)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(237,314)	114,902
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	5,246,452	5,275,503
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 5,009,138	$ 5,390,405

Consolidated Balance Sheet - USD ($)	Mar. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 5,009,138	$ 5,246,452
Accrued revenues receivable	179,807	147,848
Total Current Assets	5,188,945	5,394,300
OIL AND GAS PROPERTIES, on the basis of full cost accounting:
Proved properties	195,037,054	195,037,054
Less – Accumulated depreciation, depletion and amortization	(188,664,367)	(187,256,397)
Total oil and gas properties, on the basis of full cost accounting	6,372,687	7,780,657
Total Assets	11,561,632	13,174,957
CURRENT LIABILITIES:
Payable to Apache Corporation	53,312	14,807
Current asset retirement obligation	524,166	524,166
Other payables	84,249	84,249
Accrued operating expenses	152,752	229,564
Accrued development costs	75,018	303,136
Total Current Liabilities	889,497	1,155,922
ASSET RETIREMENT OBLIGATION	1,347,429	1,327,947
PARTNERS' CAPITAL:
Managing Partner	444,811	406,879
Investing Partners (1,021.5 units outstanding)	8,879,895	10,284,209
Total Partners' Capital	9,324,706	10,691,088
Total liabilities and partners' capital	$ 11,561,632	$ 13,174,957

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES As of March 31, 2016, 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, 2015. 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 to the consolidated financial statements contained in the Partnership’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015. 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. In the first quarter of 2016, the Partnership recorded a $1,271,885 non-cash write-down of the carrying value of its proved oil and gas properties. New Pronouncements Issued But Not Yet Adopted In May 2014, the Financial Accounting Standards Board (FASB) and the International Accounting Standards Board (IASB) issued a joint revenue recognition standard, ASU 2014-09. The new standard removes inconsistencies in existing standards, changes the way companies recognize revenue from contracts with customers, and increases disclosure requirements. The guidance requires companies to recognize revenue to depict the transfer of goods or services to customers in amounts that reflect the consideration to which the company expects to be entitled in exchange for those goods or services. In July 2015, the FASB announced a delay in the effective date of the revenue standard by one year. The deferral results in the new revenue standard becoming effective for annual and interim periods beginning after December 15, 2017. In March 2016, the FASB issued ASU 2016-08, which provides further clarification on the principal versus agent evaluation. The standard is required to be adopted using either the full retrospective approach, with all prior periods presented adjusted, or the modified retrospective approach, with a cumulative adjustment to retained earnings on the opening balance sheet. The Partnership is currently evaluating the level of effort needed to implement the standard, the impact of adopting this standard on its consolidated financial statements, and whether to use the full retrospective approach or the modified retrospective approach.

Fair Value Measurements	3 Months Ended
Fair Value Measurements	Mar. 31, 2016
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, 2016, and December 31, 2015, 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, 2016, and 2015.

- 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, 2016
Accounting Policies [Abstract]
Use of Estimates	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	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 to the consolidated financial statements contained in the Partnership’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015. 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.
New Pronouncements Issued But Not Yet Adopted	New Pronouncements Issued But Not Yet Adopted In May 2014, the Financial Accounting Standards Board (FASB) and the International Accounting Standards Board (IASB) issued a joint revenue recognition standard, ASU 2014-09. The new standard removes inconsistencies in existing standards, changes the way companies recognize revenue from contracts with customers, and increases disclosure requirements. The guidance requires companies to recognize revenue to depict the transfer of goods or services to customers in amounts that reflect the consideration to which the company expects to be entitled in exchange for those goods or services. In July 2015, the FASB announced a delay in the effective date of the revenue standard by one year. The deferral results in the new revenue standard becoming effective for annual and interim periods beginning after December 15, 2017. In March 2016, the FASB issued ASU 2016-08, which provides further clarification on the principal versus agent evaluation. The standard is required to be adopted using either the full retrospective approach, with all prior periods presented adjusted, or the modified retrospective approach, with a cumulative adjustment to retained earnings on the opening balance sheet. The Partnership is currently evaluating the level of effort needed to implement the standard, the impact of adopting this standard on its consolidated financial statements, and whether to use the full retrospective approach or the modified retrospective approach.

Asset Retirement Obligations - Changes to Partnership's Asset Retirement Obligation Liability (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligation at December 31, 2015	$ 1,852,113
Accretion expense	19,482	$ 32,031
Asset retirement obligation at March 31, 2016	1,871,595
Less current portion	(524,166)		$ (524,166)
Asset retirement obligation, long-term	$ 1,347,429		$ 1,327,947

Receivable from / Payable to Apache Corporation	3 Months Ended
Receivable from / Payable to Apache Corporation	Mar. 31, 2016
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.

Right of Presentment	3 Months Ended
Right of Presentment	Mar. 31, 2016
Equity [Abstract]
Right of Presentment	RIGHT OF PRESENTMENT As provided in the Partnership Agreement, as amended (the “Amended Partnership Agreement”), a first right of presentment valuation was computed during the first quarter of 2016. The per-unit value was determined to be $6,057 based on the valuation date of December 31, 2015. The Partnership did not repurchase any Investing Partner Units (Units) during the first three months of 2016, and is not expected to purchase any Units in the first half of 2016. The per-unit right of presentment value computed during the first quarter of 2015 was determined to be $9,765 based on the valuation date of December 31, 2014. The Partnership did not repurchase any Units during the first three months of 2015. Pursuant to the Amended Partnership Agreement, the Partnership has no obligation to purchase any Units presented to the extent it determines that it has insufficient funds for such purchases.

Summary of Significant Accounting Policies (Details)	3 Months Ended
Summary of Significant Accounting Policies (Details)	Mar. 31, 2016 USD ($)
Accounting Policies [Abstract]
Impairment of oil and gas properties	$ 1,271,885

Right of Presentment - Additional Information (Detail) - USD ($)	Mar. 31, 2016	Mar. 31, 2015
Equity [Abstract]
Investing partner units value per unit	$ 6,057	$ 9,765

Consolidated Balance Sheet (Parenthetical) - shares	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Investing Partners, units outstanding	1,021.5	1,021.5