Quarterly report pursuant to Section 13 or 15(d)

Recent Transactions (Consolidation) (Narrative) (Details)

v3.7.0.1
Recent Transactions (Consolidation) (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Feb. 03, 2017
Mar. 31, 2017
Mar. 31, 2016
Feb. 02, 2017
Dec. 31, 2016
Real Estate Properties [Line Items]          
Acquisition cost   $ 6,625 $ 7,225    
Consolidated joint ventures, total real estate assets   211,300     $ 201,900
Mack-Cali Realty LP [Member]          
Real Estate Properties [Line Items]          
Acquisition cost   $ 6,625 $ 7,225    
Mack-Cali Realty LP [Member] | Series A Units [Member]          
Real Estate Properties [Line Items]          
Preferred units shares issued 42,800        
Percentage of interest in venture 37.50%        
Preferred unit annual rate 3.50%        
Preferred units aggregate amount $ 42,800        
Plaza VIII & IX Associates, L.L.C. [Member]          
Real Estate Properties [Line Items]          
Percentage of interest in venture       50.00%  
Percentage of additional interest acquired 12.50%        
Acquisition cost $ 14,300        
Consolidated joint ventures, total real estate assets $ 60,600