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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Investment Company, Financial Highlights [Line Items]        
Balance     $ 1,493,699  
Common unit distributions   $ (2,360) (3,509) $ (6,417)
Redeemable noncontrolling interests $ (6,471) (6,471) (19,413) (16,144)
Redemption of common units for common stock    
Redemption of common units, value (29) (65) (2,170) (6,695)
Directors' deferred compensation plan 76 81 215 238
Other comprehensive income (loss) (878) (16) (9,953)
Balance 1,336,120   1,336,120  
General Partner Common Unitholders [Member]        
Investment Company, Financial Highlights [Line Items]        
Balance 1,399,033 1,645,587 1,493,699 1,486,658
Net income (loss) available to common shareholders 42,208 55,928 117,019 (166,513)
Common unit distributions (18,142) (18,106) (36,261) (54,282)
Redeemable noncontrolling interests (2,167) (3,025) (7,207) (22,936)
Change in noncontrolling interests in consolidated joint ventures       (1,958)
Redemption of common units for common stock       705
Redemption of common units, value       (1,665)
Shares issued under Dividend Reinvestment and Stock Purchase Plan 9 10 39 31
Directors' deferred compensation plan 76 81 215 238
Stock compensation 394 7 1,158 490
Cancellation of unvested LTIP units       2,819
Other comprehensive income (loss)   (791) 18 (8,993)
Rebalancing of ownership percentage between parent and subsidiaries (875) 1,426 1,478 1,641
Balance $ 1,336,120 $ 1,569,261 $ 1,336,120 $ 1,569,261