Organization, Consolidation and Presentation of Financial Statements	6 Months Ended
Jun. 30, 2011
Organization, Consolidation and Presentation of Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block]	Note A – Basis of Presentation The accompanying unaudited consolidated financial statements of Angeles Partners XII (the "Partnership" or "Registrant") have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 8-03 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of Angeles Realty Corporation II (the "Managing General Partner" or “ARC II”), all adjustments (consisting of normal recurring items) considered necessary for a fair presentation have been included. Operating results for the three and six month periods ended June 30, 2011 are not necessarily indicative of the results that may be expected for the fiscal year ending December 31, 2011. The consolidated balance sheet at December 31, 2010 has been derived from the audited financial statements at that date but does not include all of the information and disclosures required by generally accepted accounting principles for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in the Partnership's Annual Report on Form 10-K for the fiscal year ended December 31, 2010. The Managing General Partner is a wholly owned subsidiary of Apartment Investment and Management Company ("Aimco"), a publicly traded real estate investment trust. The Partnership’s management evaluated subsequent events through the time this Quarterly Report on Form 10-Q was filed. Organization: On November 24, 2010, the Partnership changed its domicile from California to Delaware by merging with and into Angeles Partners XII, LP, a Delaware limited partnership, with the Delaware partnership as the surviving entity in the merger. The merger was undertaken pursuant to an Agreement and Plan of Merger, dated as of November 24, 2010, by and between the California partnership and the Delaware partnership. All references herein to the Partnership shall mean Angeles Partners XII, a California limited partnership, for all periods prior to November 24, 2010 and Angeles Partners XII, LP, a Delaware limited partnership, for all periods from and after November 24, 2010. Under the merger agreement, each unit of limited partnership interest in the California partnership was converted into an identical unit of limited partnership interest in the Delaware partnership and the general partnership interest in the California partnership previously held by the general partner was converted into a general partnership interest in the Delaware partnership. All interests in the Delaware partnership outstanding immediately prior to the merger were cancelled in the merger. The voting and other rights of the limited partners provided for in the partnership agreement were not changed as a result of the merger. In the merger, the partnership agreement of the California partnership was adopted as the partnership agreement of the Delaware partnership, with the following changes: (i) references therein to the California Uniform Limited Partnership Act were amended to refer to the Delaware Revised Uniform Limited Partnership Act; (ii) a description of the merger was added; (iii) the name of the partnership was changed to “Angeles Partners XII, LP” and (iv) a provision was added that gives the managing general partner authority to establish different designated series of limited partnership interests that have separate rights with respect to specified partnership property, and profits and losses associated with such specified property. On July 28, 2011, the Partnership entered into an agreement and plan of merger (the “Merger Agreement”) with AIMCO Properties, L.P., a Delaware limited partnership, and AIMCO AP XII Merger Sub LLC, a Delaware limited liability company of which AIMCO Properties, L.P. is the sole member (the “Merger Subsidiary”), pursuant to which the Merger Subsidiary will be merged with and into the Partnership, with the Partnership as the surviving entity. In the merger, each unit of limited partnership interest (each, a “Unit”) of the Partnership outstanding immediately prior to the consummation of the merger (other than Units held by limited partners who perfect their appraisal rights pursuant to the Merger Agreement) will be converted into the right to receive, at the election of the limited partner, either (i) $526.71 in cash (the “Cash Consideration”) or (ii) a number of partnership common units of AIMCO Properties, L.P. calculated by dividing $526.71 by the average closing price of Aimco common stock, as reported on the New York Stock Exchange, over the ten consecutive trading days ending on the second trading day immediately prior to the effective time of the merger. However, if AIMCO Properties, L.P. determines that the law of the state or other jurisdiction in which a limited partner resides would prohibit the issuance of partnership common units of AIMCO Properties, L.P. in that state or other jurisdiction (or that registration or qualification in that state or jurisdiction would be prohibitively costly), then such limited partner will only be entitled to receive the Cash Consideration for each Unit. Those limited partners who do not make an election will be deemed to have elected to receive the Cash Consideration. After the merger, AIMCO Properties, L.P.’s membership interest in the Merger Subsidiary will be converted into Units of the Partnership. As a result, after the merger, AIMCO Properties, L.P. will be the sole limited partner of the Partnership, holding all outstanding Units. ARC II will continue to be the managing general partner of the Partnership after the merger, and AIMCO Angeles GP, LLC will continue to be the non-managing general partner of the Partnership after the merger. The Partnership’s partnership agreement in effect immediately prior to the merger will remain unchanged after the merger. Completion of the merger is subject to certain conditions, including approval by a majority in interest of the limited partners holding Units. As of June 30, 2011 and December 31, 2010, the Partnership had issued and outstanding 44,718 Units, and AIMCO Properties, L.P. and its affiliates owned 33,750 of those Units, or approximately 75.47% of the number of outstanding Units. AIMCO Properties, L.P. and its affiliates have indicated that they intend to take action by written consent to approve the merger.

Organization, Consolidation and Presentation of Financial Statements

6 Months Ended

Jun. 30, 2011

Organization, Consolidation and Presentation of Financial Statements

Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block]

Note A – Basis of Presentation

The accompanying unaudited consolidated financial statements of Angeles Partners XII (the "Partnership" or "Registrant") have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 8-03 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of Angeles Realty Corporation II (the "Managing General Partner" or “ARC II”), all adjustments (consisting of normal recurring items) considered necessary for a fair presentation have been included. Operating results for the three and six month periods ended June 30, 2011 are not necessarily indicative of the results that may be expected for the fiscal year ending December 31, 2011. The consolidated balance sheet at December 31, 2010 has been derived from the audited financial statements at that date but does not include all of the information and disclosures required by generally accepted accounting principles for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in the Partnership's Annual Report on Form 10-K for the fiscal year ended December 31, 2010. The Managing General Partner is a wholly owned subsidiary of Apartment Investment and Management Company ("Aimco"), a publicly traded real estate investment trust.

The Partnership’s management evaluated subsequent events through the time this Quarterly Report on Form 10-Q was filed.

Organization: On November 24, 2010, the Partnership changed its domicile from California to Delaware by merging with and into Angeles Partners XII, LP, a Delaware limited partnership, with the Delaware partnership as the surviving entity in the merger. The merger was undertaken pursuant to an Agreement and Plan of Merger, dated as of November 24, 2010, by and between the California partnership and the Delaware partnership. All references herein to the Partnership shall mean Angeles Partners XII, a California limited partnership, for all periods prior to November 24, 2010 and Angeles Partners XII, LP, a Delaware limited partnership, for all periods from and after November 24, 2010.

Under the merger agreement, each unit of limited partnership interest in the California partnership was converted into an identical unit of limited partnership interest in the Delaware partnership and the general partnership interest in the California partnership previously held by the general partner was converted into a general partnership interest in the Delaware partnership. All interests in the Delaware partnership outstanding immediately prior to the merger were cancelled in the merger.

The voting and other rights of the limited partners provided for in the partnership agreement were not changed as a result of the merger. In the merger, the partnership agreement of the California partnership was adopted as the partnership agreement of the Delaware partnership, with the following changes: (i) references therein to the California Uniform Limited Partnership Act were amended to refer to the Delaware Revised Uniform Limited Partnership Act; (ii) a description of the merger was added; (iii) the name of the partnership was changed to “Angeles Partners XII, LP” and (iv) a provision was added that gives the managing general partner authority to establish different designated series of limited partnership interests that have separate rights with respect to specified partnership property, and profits and losses associated with such specified property.

On July 28, 2011, the Partnership entered into an agreement and plan of merger (the “Merger Agreement”) with AIMCO Properties, L.P., a Delaware limited partnership, and AIMCO AP XII Merger Sub LLC, a Delaware limited liability company of which AIMCO Properties, L.P. is the sole member (the “Merger Subsidiary”), pursuant to which the Merger Subsidiary will be merged with and into the Partnership, with the Partnership as the surviving entity.

In the merger, each unit of limited partnership interest (each, a “Unit”) of the Partnership outstanding immediately prior to the consummation of the merger (other than Units held by limited partners who perfect their appraisal rights pursuant to the Merger Agreement) will be converted into the right to receive, at the election of the limited partner, either (i) $526.71 in cash (the “Cash Consideration”) or (ii) a number of partnership common units of AIMCO Properties, L.P. calculated by dividing $526.71 by the average closing price of Aimco common stock, as reported on the New York Stock Exchange, over the ten consecutive trading days ending on the second trading day immediately prior to the effective time of the merger. However, if AIMCO Properties, L.P. determines that the law of the state or other jurisdiction in which a limited partner resides would prohibit the issuance of partnership common units of AIMCO Properties, L.P. in that state or other jurisdiction (or that registration or qualification in that state or jurisdiction would be prohibitively costly), then such limited partner will only be entitled to receive the Cash Consideration for each Unit. Those limited partners who do not make an election will be deemed to have elected to receive the Cash Consideration.

After the merger, AIMCO Properties, L.P.’s membership interest in the Merger Subsidiary will be converted into Units of the Partnership. As a result, after the merger, AIMCO Properties, L.P. will be the sole limited partner of the Partnership, holding all outstanding Units. ARC II will continue to be the managing general partner of the Partnership after the merger, and AIMCO Angeles GP, LLC will continue to be the non-managing general partner of the Partnership after the merger. The Partnership’s partnership agreement in effect immediately prior to the merger will remain unchanged after the merger.

Completion of the merger is subject to certain conditions, including approval by a majority in interest of the limited partners holding Units. As of June 30, 2011 and December 31, 2010, the Partnership had issued and outstanding 44,718 Units, and AIMCO Properties, L.P. and its affiliates owned 33,750 of those Units, or approximately 75.47% of the number of outstanding Units. AIMCO Properties, L.P. and its affiliates have indicated that they intend to take action by written consent to approve the merger.

- Definition

The entire disclosure for the organization, consolidation and basis of presentation of financial statements disclosure, and significant accounting policies of the reporting entity. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

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