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
Mar. 31, 2018
Mar. 31, 2017
Stockolders Equity [Line Items]    
Net income available to common shareholders for basic earnings per share $ 40,282 $ 10,019
Add (deduct): Noncontrolling interest in Operating Partnership 4,883 2,295
Add (deduct): Redeemable noncontrolling interest (2,799) (792)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests in Operating Partnership unitholders (313) (1,138)
Net income available for diluted earnings per share $ 44,852 $ 11,176
Weighted average common shares 100,604 100,637
Net income available to common shareholders $ 0.45 $ 0.11
Mack-Cali Realty LP [Member]    
Stockolders Equity [Line Items]    
Net income available to common shareholders for basic earnings per share $ 44,852 $ 11,176
Add (deduct): Redeemable noncontrolling interest (2,799) (792)
Net income available for diluted earnings per share $ 44,852 $ 11,176
Weighted average common unit 100,604 100,637
Net income available to common shareholders $ 0.45 $ 0.11