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
Mar. 31, 2021
Mar. 31, 2020
Investment Company, Financial Highlights [Line Items]    
Balance $ 1,398,817  
Common stock distributions   $ (2,270)
Redeemable noncontrolling interests (6,471) (6,471)
Redemption of common units (10,459) (2,141)
Directors' deferred compensation plan 72 82
Cancellation of common stock, value (118)  
Other comprehensive income (loss)   (16)
Balance 1,406,823  
General Partner Common Unitholders [Member]    
Investment Company, Financial Highlights [Line Items]    
Balance 1,398,817 1,493,699
Net income (loss) available to common shareholders 7,623 (39,924)
Common stock distributions   (18,119)
Redeemable noncontrolling interests (1,791) (2,804)
Shares issued under Dividend Reinvestment and Stock Purchase Plan 18 19
Directors' deferred compensation plan 72 82
Stock compensation 646 430
Cancellation of common stock, value (118)  
Other comprehensive income (loss)   18
Rebalancing of ownership percent between parent and subsidiaries 1,556 742
Balance $ 1,406,823 $ 1,434,143