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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Stockolders Equity [Line Items]        
Net income (loss) available to common shareholders for basic earnings per share $ (38,813) $ (4,630) $ 202,530 $ 35,652
Add (deduct): Noncontrolling interests in Operating Partnership (2,434) (142) 25,246 4,741
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests in Operating Partnership unitholders (1,850) (384) (2,207) (697)
Net income available for diluted earnings per share $ (43,097) $ (5,156) $ 225,569 $ 39,696
Weighted average common shares 100,523 100,598 100,825 100,607
Net income (loss) available to common shareholders $ (0.43) $ (0.05) $ 2.24 $ 0.39
Mack-Cali Realty LP [Member]        
Stockolders Equity [Line Items]        
Net income (loss) available to common shareholders for basic earnings per share $ (43,097) $ (5,156) $ 225,569 $ 39,696
Net income available for diluted earnings per share $ (43,097) $ (5,156) $ 225,569 $ 39,696
Weighted average common unit 100,523 100,598 100,825 100,607
Net income (loss) available to common shareholders $ (0.43) $ (0.05) $ 2.24 $ 0.39