Annual report pursuant to Section 13 and 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 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stockolders Equity [Line Items]                      
Net income (loss) available to common shareholders for basic earnings per share                 $ 5,234 $ 117,224 $ (125,752)
Add (deduct): Noncontrolling interest in Operating Partnership                 2,711 13,721 (15,256)
Deduct: Redeemable noncontrolling interest                 (8,840)    
Deduct: Redemption value adjustment of redeemable noncontrolling interest in Operating Partnership                 (2,074)    
Net income (loss) for diluted earnings per share                 $ 5,871 $ 130,945 $ (141,008)
Weighted average common shares                 100,703 100,498 100,222
Net income (loss) available to common shareholders $ (0.01) $ 0.39 $ (0.44) $ 0.11 $ 0.17 $ (0.10) $ 0.54 $ 0.69 $ 0.06 $ 1.30 $ (1.41)
Mack-Cali Realty LP [Member]                      
Stockolders Equity [Line Items]                      
Net income (loss) available to common shareholders for basic earnings per share                 $ 5,871 $ 130,945 $ (141,008)
Deduct: Redeemable noncontrolling interest                 $ (8,840)    
Weighted average common unit                 100,703 100,498 100,222
Net income (loss) available to common shareholders $ (0.01) $ 0.39 $ (0.44) $ 0.11 $ 0.17 $ (0.10) $ 0.54 $ 0.69 $ 0.06 $ 1.30 $ (1.41)