Annual report pursuant to Section 13 and 15(d)

Noncontrolling Interests In Subsidiaries (Narrative) (Details)

v3.6.0.2
Noncontrolling Interests In Subsidiaries (Narrative) (Details)
 12 Months Ended
Feb. 03, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
property
shares
Dec. 31, 2015
Noncontrolling Interest [Line Items]      
Expiration period   10 years  
Number of common shares received upon redemption of common units   1  
Rebalance of ownership percentage | $   $ 1,400,000  
Percentage of noncontrolling interest   10.50% 10.50%
Participation Rights [Member]      
Noncontrolling Interest [Line Items]      
Number of properties | property   3  
Excess net cash flow remaining after the distribution to the Company   50.00%  
Internal rate of return   10.00%  
Subsequent Event [Member]      
Noncontrolling Interest [Line Items]      
Percentage of interest in venture 100.00%    
Mack-Cali Realty LP [Member] | Subsequent Event [Member] | Preferred Units [Member]      
Noncontrolling Interest [Line Items]      
Preferred units shares issued 42,800    
Preferred unit annual rate 3.50%    
Percentage of interest in venture 37.50%    
Preferred unit in operating partnership | $ $ 1,000    
Convertible preferred units 28.15    
Shares converted to common units 1,204,820    
Expiration period 5 years    
Future Developments [Member] | Participation Rights [Member]      
Noncontrolling Interest [Line Items]      
Number of properties | property   1