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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Stockolders Equity [Line Items]        
Net income (loss) from continuing operations available to common shareholders $ (76,253) $ (57,550) $ (159,763) $ 135,652
Add (deduct): Noncontrolling interests in Operating Partnership (7,874) (6,005) (16,166) 18,191
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests in Operating Partnership unitholders (230) (334) (763) (2,541)
Income (loss) from continuing operations for diluted earnings per share (84,357) (63,889) (176,692) 151,302
Income (loss) from discontinued operations for diluted earnings per share 35,266 (1,557) 39,313 8,821
Net income (loss) available for diluted earnings per share $ (49,091) $ (65,446) $ (137,379) $ 160,123
Weighted average common shares 100,307 100,560 100,235 100,802
Income (loss) from continuing operations available to common shareholders $ (0.84) $ (0.63) $ (1.76) $ 1.50
Income (loss) from discontinued operations available to common shareholders 0.35 (0.02) 0.39 0.09
Net income (loss) available to common shareholders $ (0.49) $ (0.65) $ (1.37) $ 1.59
Mack-Cali Realty LP [Member]        
Stockolders Equity [Line Items]        
Net income (loss) from continuing operations available to common shareholders $ (84,357) $ (63,889) $ (176,692) $ 151,302
Income (loss) from discontinued operations for diluted earnings per share 35,266 (1,557) 39,313 8,821
Net income (loss) available for diluted earnings per share $ (49,091) $ (65,446) $ (137,379) $ 160,123
Weighted average common unit 100,307 100,560 100,235 100,802
Income (loss) from continuing operations available to common shareholders $ (0.84) $ (0.63) $ (1.76) $ 1.50
Income (loss) from discontinued operations available to common shareholders 0.35 (0.02) 0.39 0.09
Net income (loss) available to common shareholders $ (0.49) $ (0.65) $ (1.37) $ 1.59