Annual report pursuant to Section 13 and 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
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stockholders Equity [Line Items]                      
Net income (loss) from continuing operations available to common shareholders                 $ (137,246,000) $ 184,504,000 $ 51,509,000
Add (deduct): Noncontrolling interests in Operating Partnership                 (13,279,000) 23,720,000 7,127,000
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests in Operating Partnership unitholders                 (1,254,000) (2,855,000) (1,296,000)
Income (loss) from continuing operations for diluted earnings per share                 (151,779,000) 205,369,000 57,340,000
Income (loss) from discontinued operations for diluted earnings per share                 81,925,000 (108,984,000) 23,577,000
Net income (loss) available for diluted earnings per share                 $ (69,854,000) $ 96,385,000 $ 80,917,000
Weighted average common shares                 100,260 100,689 100,724
Income (loss) from continuing operations available to common shareholders $ 0.22 $ (0.83) $ (0.50) $ (0.40) $ 0.51 $ (0.63) $ (0.44) $ 2.58 $ (1.51) $ 2.04 $ 0.57
Income (loss) from discontinued operations available to common shareholders 0.45 0.34 0.09 (0.07) (1.15) (0.02) 0.01 0.08 0.81 (1.09) 0.23
Net income (loss) available to common shareholders 0.67 (0.49) (0.41) (0.47) (0.64) (0.65) (0.43) 2.66 $ (0.70) $ 0.95 $ 0.80
Mack-Cali Realty LP [Member]                      
Stockholders Equity [Line Items]                      
Income (loss) from continuing operations for diluted earnings per share                 $ (151,779,000) $ 205,369,000 $ 57,340,000
Income (loss) from discontinued operations for diluted earnings per share                 81,925,000 (108,984,000) 23,577,000
Net income (loss) available for diluted earnings per share                 $ (69,854,000) $ 96,385,000 $ 80,917,000
Weighted average common unit                 100,260 100,689 100,724
Income (loss) from continuing operations available to common shareholders 0.22 (0.83) (0.50) (0.40) 0.51 (0.63) (0.44) 2.58 $ (1.51) $ 2.04 $ 0.57
Income (loss) from discontinued operations available to common shareholders 0.45 0.34 0.09 (0.07) (1.15) (0.02) 0.01 0.08 0.81 (1.09) 0.23
Net income (loss) available to common shareholders $ 0.67 $ (0.49) $ (0.41) $ (0.47) $ (0.64) $ (0.65) $ (0.43) $ 2.66 $ (0.70) $ 0.95 $ 0.80