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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Stockolders Equity [Line Items]        
Net income (loss) available to common shareholders for basic earnings per share $ (58,953) $ (4,144) $ 143,577 $ 31,508
Add (deduct): Noncontrolling interests in Operating Partnership (6,159) (167) 19,087 4,574
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests in Operating Partnership unitholders (334) (302) (2,541) (999)
Net income (loss) available for diluted earnings per share $ (65,446) $ (4,613) $ 160,123 $ 35,083
Weighted average common shares 100,560 100,712 100,802 100,684
Net income (loss) available to common shareholders $ (0.65) $ (0.05) $ 1.59 $ 0.35
Mack-Cali Realty LP [Member]        
Stockolders Equity [Line Items]        
Net income (loss) available to common shareholders for basic earnings per share $ (65,446) $ (4,613) $ 160,123 $ 35,083
Net income (loss) available for diluted earnings per share $ (65,446) $ (4,613) $ 160,123 $ 35,083
Weighted average common unit 100,560 100,712 100,802 100,684
Net income (loss) available to common shareholders $ (0.65) $ (0.05) $ 1.59 $ 0.35