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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stockolders Equity [Line Items]                      
Net income (loss) from continuing operations available to common shareholders                 $ 184,273,000 $ 49,213,000 $ (15,274,000)
Net income available to common shareholders                 252,554,000 80,267,000 10,840,000
Add (deduct): Noncontrolling interests in Operating Partnership                 23,685,000 6,866,000 341,000
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests in Operating Partnership unitholders                 (2,855,000) (1,296,000) (2,074,000)
Income (loss) from continuing operations for diluted earnings per share                 205,103,000 54,783,000 (17,007,000)
Income from discontinued operations for diluted earnings per share                 (108,718,000) 26,134,000 22,878,000
Net income (loss) available for diluted earnings per share                 $ 96,385,000 $ 80,917,000 $ 5,871,000
Weighted average common shares                 100,689 100,724 100,703
Income (loss) from continuing operations available to common shareholders $ 0.53 $ (0.64) $ (0.45) $ 2.58 $ 0.37 $ (0.12) $ (0.13) $ 0.42 $ 2.03 $ 0.54 $ (0.17)
Income from discontinued operations available to common shareholders (1.17) (0.01) 0.02 0.08 0.08 0.07 0.08 0.03 (1.08) 0.26 0.23
Net income (loss) available to common shareholders (0.64) (0.65) (0.43) 2.66 0.45 (0.05) (0.05) 0.45 $ 0.95 $ 0.80 $ 0.06
Mack-Cali Realty LP [Member]                      
Stockolders Equity [Line Items]                      
Net income available to common shareholders                 $ 252,554,000 $ 80,267,000  
Income (loss) from continuing operations for diluted earnings per share                 205,103,000 54,783,000 $ (17,007,000)
Income from discontinued operations for diluted earnings per share                 (108,718,000) 26,134,000 22,878,000
Net income (loss) available for diluted earnings per share                 $ 96,385,000 $ 80,917,000 $ 5,871,000
Weighted average common unit                 100,689 100,724 100,703
Income (loss) from continuing operations available to common shareholders 0.53 (0.64) (0.45) 2.58 0.37 (0.12) (0.13) 0.42 $ 2.03 $ 0.54 $ (0.17)
Income from discontinued operations available to common shareholders (1.17) (0.01) 0.02 0.08 0.08 0.07 0.08 0.03 (1.08) 0.26 0.23
Net income (loss) available to common shareholders $ (0.64) $ (0.65) $ (0.43) $ 2.66 $ 0.45 $ (0.05) $ (0.05) $ 0.45 $ 0.95 $ 0.80 $ 0.06