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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Stockolders Equity [Line Items]        
Net income (loss) available to common shareholders for basic earnings per share $ (4,144) $ 35,326 $ 31,508 $ 5,464
Add (deduct): Noncontrolling interest in Operating Partnership (167) 4,413 4,574 2,412
Add (deduct): Redeemable noncontrolling interest (3,785) (2,683) (9,573) (6,157)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests in Operating Partnership unitholders (302) (316) (999) (1,748)
Net income available for diluted earnings per share $ (4,613) $ 39,423 $ 35,083 $ 6,128
Weighted average common shares 100,712 100,727 100,684 100,701
Net income (loss) available to common shareholders $ (0.05) $ 0.39 $ 0.35 $ 0.06
Mack-Cali Realty LP [Member]        
Stockolders Equity [Line Items]        
Net income (loss) available to common shareholders for basic earnings per share $ (4,613) $ 39,423 $ 35,083 $ 6,128
Add (deduct): Redeemable noncontrolling interest (3,785) (2,683) (9,573) (6,157)
Net income available for diluted earnings per share $ (4,613) $ 39,423 $ 35,083 $ 6,128
Weighted average common unit 100,712 100,727 100,684 100,701
Net income (loss) available to common shareholders $ (0.05) $ 0.39 $ 0.35 $ 0.06