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 - Basic 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 - Basic 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]        
Income (loss) from continuing operations $ (26,581) $ (75,296) $ (125,710) $ (147,999)
Add (deduct): Noncontrolling interests in consolidated joint ventures 1,137 895 3,670 1,900
Add (deduct): Noncontrolling interests in Operating Partnership 2,884 7,769 12,858 15,859
Add (deduct): Redeemable noncontrolling interests (6,471) (6,471) (19,413) (19,413)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders (1,562) (2,167) (4,903) (7,207)
Income (loss) from continuing operations available to common shareholders (30,593) (75,270) (133,498) (156,860)
Income (loss) from discontinued operations available to common shareholders 717 30,895 35,825 32,634
Net income (loss) available to common shareholders for basic earnings per share $ (29,876) $ (44,375) $ (97,673) $ (124,226)
Weighted average common shares 90,941 90,671 90,803 90,639
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]        
Income (loss) from continuing operations $ (26,581) $ (75,296) $ (125,710) $ (147,999)
Add (deduct): Noncontrolling interests in consolidated joint ventures 1,137 895 3,670 1,900
Add (deduct): Redeemable noncontrolling interests (6,471) (6,471) (19,413) (19,413)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders (1,717) (2,397) (5,392) (7,970)
Income (loss) from continuing operations available to common shareholders (33,632) (83,269) (146,845) (173,482)
Income (loss) from discontinued operations available to common shareholders 789 34,178 39,408 36,103
Net income (loss) available to common shareholders for basic earnings per share $ (32,843) $ (49,091) $ (107,437) $ (137,379)
Weighted average common units 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)