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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Investment Company, Financial Highlights [Line Items]        
Balance     $ 1,398,817  
Redeemable noncontrolling interests $ (6,471) $ (6,471) (19,413) $ (19,413)
Redemption of common units (295) (29) (11,164) (2,170)
Directors' deferred compensation plan 91 76 229 215
Cancellation of common stock, value     (118)  
Other comprehensive income (loss)       (16)
Balance 1,308,025   1,308,025  
General Partner Common Unitholders [Member]        
Investment Company, Financial Highlights [Line Items]        
Balance 1,335,226 1,399,033 1,398,817 1,493,699
Net income (loss) available to common shareholders (28,314) (42,208) (92,770) (117,019)
Redeemable noncontrolling interests (1,562) (2,167) (4,903) (7,207)
Redemption of common units for common stock     2,716  
Shares issued under Dividend Reinvestment and Stock Purchase Plan 4 9 33 39
Directors' deferred compensation plan 91 76 229 215
Stock compensation 1,632 394 3,517 1,158
Cancellation of common stock, value     (118)  
Other comprehensive income (loss)       18
Rebalancing of ownership percent between parent and subsidiaries 948 (875) 504 1,478
Balance $ 1,308,025 $ 1,336,120 $ 1,308,025 $ 1,336,120