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Consolidated Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Assets    
Allowance for doubtful accounts (in US dollars) $ 1,359us-gaap_AllowanceForDoubtfulAccountsReceivable $ 1,544us-gaap_AllowanceForDoubtfulAccountsReceivable
Unamortized leasing fees to Vornado (in US dollars) 33,483alx_UnamortizedLeasingFeesToRelatedParty 33,974alx_UnamortizedLeasingFeesToRelatedParty
Deferred debt issuance costs, accumulated amortization (in US dollars) $ 11,895us-gaap_AccumulatedAmortizationDeferredFinanceCosts $ 11,295us-gaap_AccumulatedAmortizationDeferredFinanceCosts
Statement [Line Items]    
Preferred stock: par value per share (in dollars per share) $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock: authorized shares 3,000,000us-gaap_PreferredStockSharesAuthorized 3,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock: issued shares 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock: outstanding shares 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock: par value per share (in dollars per share) $ 1.00us-gaap_CommonStockParOrStatedValuePerShare $ 1.00us-gaap_CommonStockParOrStatedValuePerShare
Common stock: authorized shares 10,000,000us-gaap_CommonStockSharesAuthorized 10,000,000us-gaap_CommonStockSharesAuthorized
Common stock: issued shares 5,173,450us-gaap_CommonStockSharesIssued 5,173,450us-gaap_CommonStockSharesIssued
Common stock: outstanding shares 5,106,196us-gaap_CommonStockSharesOutstanding 5,106,196us-gaap_CommonStockSharesOutstanding
Treasury stock: shares 67,254us-gaap_TreasuryStockShares 67,254us-gaap_TreasuryStockShares