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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Investment Company, Financial Highlights [Line Items]        
Balance     $ 1,493,699  
Common unit distributions   $ (2,361) (1,480) $ (4,057)
Redeemable noncontrolling interests $ (6,471) (5,006) (12,942) (9,673)
Redemption of common units for common stock    
Redemption of common units, value     (2,141) (6,630)
Directors' deferred compensation plan 57 27 139 157
Other comprehensive income (loss)   (4,624) (16) (9,075)
Balance 1,399,033   1,399,033  
General Partner Common Unitholders [Member]        
Investment Company, Financial Highlights [Line Items]        
Balance 1,434,143 1,704,018 1,493,699 1,486,658
Net income (loss) available to common shareholders 34,887 22,054 74,811 (222,441)
Common unit distributions   (18,111) (18,119) (36,176)
Redeemable noncontrolling interests (2,236) (16,759) (5,040) (19,911)
Change in noncontrolling interests in consolidated joint ventures       (1,958)
Redemption of common units for common stock   623   705
Redemption of common units, value       (1,665)
Shares issued under Dividend Reinvestment and Stock Purchase Plan 11 11 30 21
Directors' deferred compensation plan 57 27 139 157
Stock compensation 334 218 764 483
Cancellation of unvested LTIP units       2,819
Other comprehensive income (loss)   (4,164) 18 (8,202)
Rebalancing of ownership percentage between parent and subsidiaries 1,611 1,778 2,353 215
Balance $ 1,399,033 $ 1,645,587 $ 1,399,033 $ 1,645,587