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, 2020
Mar. 31, 2019
Investment Company, Financial Highlights [Line Items]    
Balance $ 1,493,699  
Issuance of limited partner common units   $ 7,460
Common unit distributions (2,270) (1,696)
Redeemable noncontrolling interests (6,471) (4,667)
Redemption of common units for common stock (2,141)  
Redemption of common units, value   (6,630)
Directors' deferred compensation plan 82 130
Other comprehensive income (loss) (16) (4,451)
Balance 1,434,143  
General Partner Common Unitholders [Member]    
Investment Company, Financial Highlights [Line Items]    
Balance 1,493,699 1,486,658
Net income (loss) 39,924 (244,495)
Common unit distributions (18,119) (18,065)
Redeemable noncontrolling interests (2,804) (3,152)
Change in noncontrolling interests in consolidated joint ventures   (1,958)
Redemption of common units for common stock   82
Redemption of common units, value   (1,665)
Shares issued under Dividend Reinvestment and Stock Purchase Plan 19 10
Directors' deferred compensation plan 82 130
Stock compensation 430 265
Cancellation of unvested LTIP units   2,819
Other comprehensive income (loss) 18 (4,038)
Rebalancing of ownership percentage between parent and subsidiaries 742 (1,563)
Balance $ 1,434,143 $ 1,704,018