Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share Tables - Diluted Computation Of EPS) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share Tables - Diluted Computation Of EPS) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Stockholders Equity [Line Items]        
Net income (loss) from continuing operations available to common shareholders $ (30,593) $ (75,270) $ (133,498) $ (156,860)
Add (deduct): Noncontrolling interests in Operating Partnership (2,884) (7,769) (12,858) (15,859)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests in the Operating Partnership unitholders (155) (230) (489) (763)
Income (loss) from continuing operations for diluted earnings per share (33,632) (83,269) (146,845) (173,482)
Income (loss) from discontinued operations for diluted earnings per share 789 34,178 39,408 36,103
Net income (loss) available for diluted earnings per share $ (32,843) $ (49,091) $ (107,437) $ (137,379)
Weighted average common shares 99,975 100,307 99,870 100,235
Income (loss) from continuing operations available to common shareholders $ (0.34) $ (0.83) $ (1.47) $ (1.73)
Income (loss) from discontinued operations available to common shareholders 0.01 0.34 0.39 0.36
Net income (loss) available to common shareholders $ (0.33) $ (0.49) $ (1.08) $ (1.37)
Mack-Cali Realty LP [Member]        
Stockholders Equity [Line Items]        
Net income (loss) from continuing operations available to common shareholders $ (33,632) $ (83,269) $ (146,845) $ (173,482)
Income (loss) from discontinued operations for diluted earnings per share 789 34,178 39,408 36,103
Net income (loss) available for diluted earnings per share $ (32,843) $ (49,091) $ (107,437) $ (137,379)
Weighted average common unit 99,975 100,307 99,870 100,235
Income (loss) from continuing operations available to common shareholders $ (0.34) $ (0.83) $ (1.47) $ (1.73)
Income (loss) from discontinued operations available to common shareholders 0.01 0.34 0.39 0.36
Net income (loss) available to common shareholders $ (0.33) $ (0.49) $ (1.08) $ (1.37)