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Significant accounting policies (Policies) | 12 Months Ended
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Dec. 31, 2012
Accounting Policies [Abstract] |
Basis of Accounting [Policy Text Block] | Basis of Presentation – The accompanying consolidated financial statements include our accounts and those of our consolidated subsidiaries. All intercompany amounts have been eliminated. Our financial statements are prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”), which requires us 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 periods. Actual results could differ from those estimates. Certain prior year balances have been reclassified in order to conform to current year presentation.
Recently Issued Accounting Literature [Policy Text Block] | Recently Issued Accounting Literature – In May 2011, the Financial Accounting Standards Board (“FASB”) issued Update No. 2011-04, Fair Value Measurements (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs (“ASU No. 2011-04”). ASU No. 2011-04 provides a uniform framework for fair value measurements and related disclosures between GAAP and International Financial Reporting Standards (“IFRS”) and requires additional disclosures, including: (i) quantitative information about unobservable inputs used, a description of the valuation processes used, and a qualitative discussion about the sensitivity of the measurements to changes in the unobservable inputs, for Level 3 fair value measurements; (ii) fair value of financial instruments not measured at fair value but for which disclosure of fair value is required, based on their levels in the fair value hierarchy; and (iii) transfers between Level 1 and Level 2 of the fair value hierarchy. The adoption of this update on January 1, 2012, did not have a material impact on our consolidated financial statements, but resulted in additional fair value meas urement disclosures (see Note 8 - Fair Value Measurements). In June 2011, the FASB issued Update No. 2011-05, Comprehensive Income (Topic 220): Presentation of Comprehensive Income (“ASU No. 2011-05”). ASU No. 2011-05 requires the presentation of net income and other comprehensive income in one continuous statement or in two separate but consecutive statements. The adoption of this update on January 1, 2012, resulted in the presentation of comprehensive i ncome as a separate financial statement.
Real Estate [Policy Text Block] | Real Estate – Real estate is carried at cost, net of accumulated depreciation and amortization. Maintenance and repairs are expensed as incurred. Depreciation requires an estimate by management of the useful life of each property and improvement as well as an allocation of the costs associated with a property to its various components. If we do not allocate these costs appropriately or incorrectly estimate the useful lives of our real estate, depreciation expense may be misstated. As real estate is undergoing development activities, all property operating expenses directly associated with and attributable to, the development and construction of a project, including interest expense, are capitalized to the cost of the real property to the extent that we believe such costs are recoverable through the value of the property. The capitalization period begins when development activities are underway and ends when the project is substantially complete. General and administrative costs are expensed as incurred. Depreciation is provided on a straight-line basis over estimated useful lives, which range from 5 to 40 years. Tenant allowances are amortized on a straight-line basis over the lives of the related leases, which approximate the useful lives of the assets. Our properties and related intangible assets, including properties to be developed in the future, are individually reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. An impairment exists when the carrying amount of an asset exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset. Estimates of future cash flows are based on our current plans, intended holding periods and available market information at the time the analyses are prepared. For our development properties, estimates of future cash flows also include all future expenditures necessary to develop the asset, including interest payments that will be capitalized as part of the cost of the asset. An impairment loss is recognized only if the carrying amount of the asset is not recoverable and is measured based on the excess of the property's carrying amount over its estimated fair value. If our estimates of future cash flows, anticipated holding periods, or fair values change, based on market conditions or otherwise, our evaluation of impairment charges may be different and such differences could be material to our consolidated financial statements. Estimates of future cash flows are subjective and are based, in part, on assumptions regarding future occupancy, rental rates and capital requirements that could differ materially from actual results. Plans to hold properties over longer periods decrease the likelihood of recording impairment losses.
Cash and Cash Equivalents [Policy Text Block] | Cash and Cash Equivalents – Cash and cash equivalents consist of highly liquid investments with original maturities of three months or less and are carried at cost, which approximates fair value, due to their short-term maturities. The majority of our cash and cash equivalents consist of (i) deposits at major commercial banks, which may at times exceed the Federal Deposit Insurance Corporation limit, (ii) money market funds, which invest in obligations of the United States government and (iii) certificates of deposit placed through an account registry service (“CDARS”). To date we have not experienced any losses on our invested cash.
Short-term Investments [Policy Text Block] | Short-term Investments – Short-term investments consist of CDARS with original maturities greater than three but less than six months. These investments are FDIC insured and classified as available-for-sale. Marketable Securities – Our marketable securities consist of common shares of The Macerich Company (NYSE: MAC) (“Macerich”), which are classified as available-for-sale. Available-for-sale securities are presented at fair value on our consolidated balance sheet. Unrealized gains and losses resulting from the mark-to-market of these securities are included in “other comprehensive income” and are recognized in earnings only upon the sale of the securities. We evaluate our marketable securities for impairment at the end of each reporting period. If investments have unrealized losses, we evaluate the underlying cause of the decline in value and the estimated recovery period, as well as the severity and duration of the decline. In our evaluation, we consider our ability and intent to hold our investment for a reasonable period of time sufficient for us to recover our cost basis, as well as the near-term prospects for the investment in relation to the severity and duration of the decline.
Restricted Cash [Policy Text Block] | Restricted Cash – Restricted cash primarily consists of cash held in a non-interest bearing escrow account in connection with our Rego Park I 100% cash collateralized mortgage, as well as security deposits and other cash escrowed under loan agreements for debt service, real estate taxes, property insurance and capital improvements.
Allowance for Doubtful Accounts [Policy Text Block] | Allowance for Doubtful Accounts – We periodically evaluate the collectibility of amounts due from tenants, including the receivable arising from the straight-lining of rents, and maintain an allowance for doubtful accounts ($2,219,000 and $1,039,000 as of December 31, 2012 and 2011, respectively) for the estimated losses resulting from the inability of tenants to make required payments under the lease agreements. We exercise judgment in establishing these allowances and consider payment history and current credit status in developing these estimates.
Deferred Charges [Policy Text Block] | Deferred Charges – Direct financing costs are deferred and amortized over the terms of the related agreements as a component of interest and debt expense. Direct costs related to leasing activities are capitalized and amortized on a straight-line basis over the lives of the related leases. All other deferred charges are amortized on a straight-line basis, which approximates the effective interest rate method, in accordance with the terms of the agreements to which they relate.
Revenue Recognition [Policy Text Block] | Revenue Recognition – We have the following revenue sources and revenue recognition policies: Base Rent – revenue arising from tenant leases. These rents are recognized over the non-cancelable term of the related leases on a straight-line basis, which includes the effects of rent steps and free rent abatements under the leases. We commence rental revenue recognition when the tenant takes possession of the leased space and the leased space is substantially ready for its intended use. In addition, in circumstances where we provide a tenant improvement allowance for improvements that are owned by the tenant, we recognize the allowance as a reduction of rental revenue on a straight-line basis over the term of the lease. Percentage Rent – revenue arising from retail tenant leases that is contingent upon the sales of tenants exceeding defined thresholds. These rents are recognized only after the contingency has been removed (i.e., when tenant sales threshold s have been achieved). Expense Reimbursements – revenue arising from tenant leases which provide for the recovery of all or a portion of the operating expenses and real estate taxes of the respective properties. This revenue is accrued in the same periods as the expenses are incurred. Parking Income – revenue arising from the rental of parking space at our properties. This income is recognized as cash is received.
Income Taxes [Policy Text Block] | Income Taxes – We operate in a manner intended to enable us to continue to qualify as a Real Estate Investment Trust (“REIT”) under Sections 856 – 860 of the Internal Revenue Code of 1986, as amended (the “Code”). In order to maintain our qualification as a REIT under the Code, we must distribute at least 90% of our taxable income to stockholders each year. We distribute to our stockholders 100% of our taxable income and therefore, no provision for Federal income taxes is required. If we fail to distribute the required amount of income to our stockholders, or fail to meet other REIT requirements, we may fail to qualify as a REIT, which may result in substantial adverse tax consequences. The following table reconciles our net inco me to estimated taxable income for the years ended December 31, 2012, 2011 and 2010.
| (Unaudited and in thousands) | Years Ended December 31, |  |
|  |  | 2012 |  | 2011 |  | 2010 |  |
| Net income attributable to Alexander’s | $ | 674,387 |  | $ | 79,423 |  | $ | 66,429 |  |
| Additional tax gain on sale of the Kings Plaza Regional |  |  |  |  |  |  |  |  |  |
|  | Shopping Center |  | 23,928 |  |  | - |  |  | - |  |
| Straight-line rent adjustments |  | (4,475) |  |  | (12,609) |  |  | (15,182) |  |
| Depreciation and amortization timing differences |  | 910 |  |  | 1,263 |  |  | 602 |  |
| Interest expense |  | 29 |  |  | (2,425) |  |  | - |  |
| Reversal of liability for income taxes |  | - |  |  | - |  |  | (3,162) |  |
| Other |  | 4,396 |  |  | (3,429) |  |  | 6,245 |  |
| Taxable income before net operating loss ("NOL") |  | 699,175 |  |  | 62,223 |  |  | 54,932 |  |
| NOL carried forward |  | - |  |  | - |  |  | (16,939) |  |
| Estimated taxable income | $ | 699,175 |  | $ | 62,223 |  | $ | 37,993 |  |
At December 31, 2012, the net basis of our assets and liabilities for tax purposes are approximately $184,806,000 lower than the amount reported for financial statement purposes.
Income Per Share [Policy Text Block] | Income Per Share – Basic income per share is computed based on weighted average shares of common stock (including deferred stock units) outstanding during the period. Diluted income per share is computed based on the weighted average shares of common stock (including deferred stock units) outstanding during the period, and assumes all potentially dilutive securities were converted into common stock at the earliest date possible. There were no potentially dilutive securities outstanding during the years ended December 31, 2012, 2011 and 2010.

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- Definition Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). + References No definition available. + Details
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- Definition Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 203 -Paragraph 02-03 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 8, 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Technical Practice Aid (TPA) -Number 2110 -Paragraph 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4273-108586 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2122427 + Details
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- Definition Entity's cash and cash equivalents accounting policy with respect to restricted balances. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2122427 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4273-108586 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 203 -Paragraph 02-03 + Details
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- Definition Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 6, 8-16, 60 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2144384 + Details
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- Definition Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.B.Q1) -URI http://asc.fasb.org/extlink&oid=6600647&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 22 -Paragraph 8, 12, 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18823-107790 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18726-107790 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section B -Paragraph Question 1 + Details
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