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 - 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 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)                 $ 252,554 $ 80,267 $ 10,840
Add (deduct): Noncontrolling interests in consolidated joint ventures                 3,904 1,216 1,018
Add (deduct): Noncontrolling interests in Operating Partnership                 (23,685) (6,866) (341)
Add (deduct): Redeemable noncontrolling interests                 (22,615) (13,979) (8,840)
Add (deduct): Redeemable noncontrolling interest                 (22,615) (13,979) (8,840)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders                 (25,885) (11,425) (17,951)
Income (loss) from continuing operations available to common shareholders                 184,273 49,213 (15,274)
Income from discontinued operations available to common shareholders                 (98,297) 23,473 20,508
Net income (loss) available to common shareholders for basic earnings per share                 $ 85,976 $ 72,686 $ 5,234
Weighted average common shares                 90,557 90,388 90,005
Income (loss) from continuing operations available to common shareholders $ 0.53 $ (0.64) $ (0.45) $ 2.59 $ 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 available to common unitholders (0.64) (0.65) (0.43) 2.67 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 (loss)                 $ 252,554 $ 80,267 $ 10,840
Add (deduct): Noncontrolling interests in consolidated joint ventures                 3,904 1,216 1,018
Add (deduct): Redeemable noncontrolling interests                 (22,615) (13,979) (8,840)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders                 (28,740) (12,721) (20,025)
Income (loss) from continuing operations available to common shareholders                 205,103 54,783 (17,007)
Income from discontinued operations available to common shareholders                 (108,718) 26,134 22,878
Net income (loss) available to common shareholders for basic earnings per share                 $ 96,385 $ 80,917 $ 5,871
Weighted average common units                 100,520 100,634 100,410
Income (loss) from continuing operations available to common shareholders 0.53 (0.64) (0.45) 2.59 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 available to common unitholders $ (0.64) $ (0.65) $ (0.43) $ 2.67 $ 0.45 $ (0.05) $ (0.05) $ 0.45 $ 0.95 $ 0.80 $ 0.06