Document And Entity Information
9 Months Ended
Sep. 30, 2011
Oct. 24, 2011
Document And Entity Information [Abstract]  
Entity Registrant NameMACK CALI REALTY CORP 
Document Type10-Q 
Amendment Flagfalse 
Document Period End DateSep. 30, 2011
Entity Central Index Key0000924901 
Current Fiscal Year End Date--12-31 
Entity Filer CategoryLarge Accelerated Filer 
Entity Common Stock, Shares Outstanding 87,143,067
Document Fiscal Year Focus2011 
Document Fiscal Period FocusQ3