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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Stockolders Equity [Line Items]        
Net income (loss) from continuing operations available to common shareholders $ (45,986) $ (40,750) $ (83,510) $ 193,202
Add (deduct): Noncontrolling interests in Operating Partnership (4,626) (2,647) (8,292) 24,196
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests in Operating Partnership unitholders (237) (1,850) (533) (2,207)
Income (loss) from continuing operations for diluted earnings per share (50,849) (45,247) (92,335) 215,191
Income (loss) from discontinued operations for diluted earnings per share 9,800 2,150 4,047 10,378
Net income (loss) available for diluted earnings per share $ (41,049) $ (43,097) $ (88,288) $ 225,569
Weighted average common shares 100,213 100,523 100,198 100,825
Income (loss) from continuing operations available to common shareholders $ (0.51) $ (0.45) $ (0.92) $ 2.14
Income (loss) from discontinued operations available to common shareholders 0.10 0.02 0.04 0.10
Net income (loss) available to common shareholders $ (0.41) $ (0.43) $ (0.88) $ 2.24
Mack-Cali Realty LP [Member]        
Stockolders Equity [Line Items]        
Net income (loss) from continuing operations available to common shareholders $ (50,849) $ (45,247) $ (92,335) $ 215,191
Income (loss) from discontinued operations for diluted earnings per share 9,800 2,150 4,047 10,378
Net income (loss) available for diluted earnings per share $ (41,049) $ (43,097) $ (88,288) $ 225,569
Weighted average common unit 100,213 100,523 100,198 100,825
Income (loss) from continuing operations available to common shareholders $ (0.51) $ (0.45) $ (0.92) $ 2.14
Income (loss) from discontinued operations available to common shareholders 0.10 0.02 0.04 0.10
Net income (loss) available to common shareholders $ (0.41) $ (0.43) $ (0.88) $ 2.24