Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2018
Jan. 31, 2019
Jun. 30, 2018
Document And Entity Information [Abstract]   
Entity Registrant NameALEXANDERS INC  
Entity Central Index Key0000003499  
Document Type10-K  
Document Period End DateDec. 31, 2018  
Document Fiscal Year Focus2018  
Document Fiscal Period FocusFY  
Amendment Flagfalse  
Current Fiscal Year End Date--12-31  
Entity Filer CategoryLarge Accelerated Filer  
Entity Common Stock, Shares Outstanding 5,107,290 
Entity Public Float  $ 810,094,000
Entity Emerging Growth Companyfalse  
Entity Small Businessfalse  
Entity Well-known Seasoned IssuerYes  
Entity Voluntary FilersNo  
Entity Current Reporting StatusYes  
Trading Symbolalx  
Entity Shell Companyfalse  

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