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, 2019
Mar. 31, 2018
Stockolders Equity [Line Items]    
Net income available to common shareholders for basic earnings per share $ 241,343 $ 40,282
Add (deduct): Noncontrolling interests in Operating Partnership 27,680 4,883
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests in Operating Partnership unitholders (357) (313)
Net income available for diluted earnings per share $ 268,666 $ 44,852
Weighted average common shares 100,943 100,604
Net income (loss) available to common shareholders $ 2.66 $ 0.45
Mack-Cali Realty LP [Member]    
Stockolders Equity [Line Items]    
Net income available to common shareholders for basic earnings per share $ 268,666 $ 44,852
Net income available for diluted earnings per share $ 268,666 $ 44,852
Weighted average common unit 100,943 100,604
Net income (loss) available to common shareholders $ 2.66 $ 0.45