Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of General Partner Capital) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of General Partner Capital) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Investment Company, Financial Highlights [Line Items]        
Balance     $ 1,398,817  
Common stock distributions       $ (1,480)
Redeemable noncontrolling interests $ (6,471) $ (6,471) (12,942) (12,942)
Redemption of common units (410)   (10,869) (2,141)
Directors' deferred compensation plan 66 57 138 139
Cancellation of common stock, value     (118)  
Other comprehensive income (loss)       (16)
Balance 1,335,226   1,335,226  
General Partner Common Unitholders [Member]        
Investment Company, Financial Highlights [Line Items]        
Balance 1,406,823 1,434,143 1,398,817 1,493,699
Net income (loss) available to common shareholders (72,079) (34,887) (64,456) (74,811)
Common stock distributions       (18,119)
Redeemable noncontrolling interests (1,550) (2,236) (3,341) (5,040)
Redemption of common units for common stock 2,716   2,716  
Shares issued under Dividend Reinvestment and Stock Purchase Plan 11 11 29 30
Directors' deferred compensation plan 66 57 138 139
Stock compensation 1,239 334 1,885 764
Cancellation of common stock, value     (118)  
Other comprehensive income (loss)       18
Rebalancing of ownership percent between parent and subsidiaries (2,000) 1,611 (444) 2,353
Balance $ 1,335,226 $ 1,399,033 $ 1,335,226 $ 1,399,033