Quarterly report pursuant to Section 13 or 15(d)

Noncontrolling Interests In Subsidiaries (Narrative) (Details)

v3.7.0.1
Noncontrolling Interests In Subsidiaries (Narrative) (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2017
USD ($)
property
shares
Dec. 31, 2016
Noncontrolling Interest [Line Items]    
Number of common shares received upon redemption of common units | shares 1  
Rebalance of ownership percentage $ 2.9  
Percentage of noncontrolling interest 10.40% 10.50%
Cash consideration $ 2.0  
Issuance of common units | shares 99,412  
Common unit value $ 2.8  
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%  
150 Main St [Member]    
Noncontrolling Interest [Line Items]    
Cash consideration $ 2.0  
Issuance of common units | shares 99,412  
Common unit value $ 2.8  
Mack-Cali Realty LP [Member]    
Noncontrolling Interest [Line Items]    
Cash consideration $ 2.0  
Issuance of common units | shares 99,412  
Common unit value $ 2.8  
Future Developments [Member] | Participation Rights [Member]    
Noncontrolling Interest [Line Items]    
Number of properties | property 1