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, 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]                      
Income (loss) from continuing operations                 $ (115,523) $ 252,820 $ 82,824
Add (deduct): Noncontrolling interests in consolidated joint ventures                 2,695 3,904 1,216
Add (deduct): Noncontrolling interests in Operating Partnership                 13,279 (23,720) (7,127)
Add (deduct): Redeemable noncontrolling interests                 (25,883) (22,615) (13,979)
Add (deduct): Redeemable noncontrolling interest                 (25,883) (22,615) (13,979)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders                 (11,814) (25,885) (11,425)
Income (loss) from continuing operations available to common shareholders                 (137,246) 184,504 51,509
Income (loss) from discontinued operations available to common shareholders                 74,045 (98,528) 21,177
Net income (loss) available to common shareholders for basic earnings per share                 $ (63,201) $ 85,976 $ 72,686
Weighted average common shares                 90,648 90,557 90,388
Income (loss) from continuing operations available to common shareholders $ 0.22 $ (0.83) $ (0.50) $ (0.40) $ 0.51 $ (0.63) $ (0.44) $ 2.59 $ (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) 2.67 $ (0.70) $ 0.95 $ 0.80
Mack-Cali Realty LP [Member]                      
Stockholders Equity [Line Items]                      
Income (loss) from continuing operations                 $ (115,523) $ 252,820 $ 82,824
Add (deduct): Noncontrolling interests in consolidated joint ventures                 2,695 3,904 1,216
Add (deduct): Redeemable noncontrolling interests                 (25,883) (22,615) (13,979)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders                 (13,068) (28,740) (12,721)
Income (loss) from continuing operations available to common shareholders                 (151,779) 205,369 57,340
Income (loss) from discontinued operations available to common shareholders                 81,925 (108,984) 23,577
Net income (loss) available to common shareholders for basic earnings per share                 $ (69,854) $ 96,385 $ 80,917
Weighted average common units                 100,260 100,520 100,634
Income (loss) from continuing operations available to common shareholders 0.22 (0.83) (0.50) (0.40) 0.51 (0.63) (0.44) 2.59 $ (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) $ 2.67 $ (0.70) $ 0.95 $ 0.80