Annual report pursuant to Section 13 and 15(d)

Cover

v3.20.1
Cover - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 24, 2020
Jun. 30, 2019
Entity Information [Line Items]      
Document Type 10-K/A    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019    
Current Fiscal Year End Date --12-31    
Entity File Number 1-13274    
Entity Registrant Name MACK-CALI REALTY CORPORATION    
Entity Central Index Key 0000924901    
Entity Tax Identification Number 22-3305147    
Entity Incorporation, State or Country Code MD    
Entity Address, Address Line One Harborside 3    
Entity Address, Address Line Two 210 Hudson St.    
Entity Address, Address Line Three Ste. 400    
Entity Address, City or Town Jersey City    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 07311    
City Area Code 732    
Local Phone Number 590-1010    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol CLI    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 2,102,611,115
Entity Common Stock, Shares Outstanding   90,595,470  
Mack-Cali Realty LP [Member]      
Entity Information [Line Items]      
Document Type 10-K/A    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019    
Current Fiscal Year End Date --12-31    
Entity File Number 333-57103    
Entity Registrant Name MACK-CALI REALTY, L.P.    
Entity Central Index Key 0001067063    
Entity Tax Identification Number 22-3315804    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One Harborside 3    
Entity Address, Address Line Two 210 Hudson St.    
Entity Address, Address Line Three Ste. 400    
Entity Address, City or Town Jersey City    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 07311    
City Area Code 732    
Local Phone Number 590-1010    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false