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 - Basic Computation Of EPS) (Details)

v3.8.0.1
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share Tables - Basic 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)                 $ 33,718 $ 130,294 $ (142,052)
Add: Noncontrolling interest in consolidated joint ventures                 1,018 651 1,044
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 interests                 (17,951)    
Net income (loss) available to common shareholders for basic earnings per share                 $ 5,234 $ 117,224 $ (125,752)
Weighted average common shares                 90,005 89,746 89,291
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 $ 1.31 $ (1.41)
Mack-Cali Realty LP [Member]                      
Stockolders Equity [Line Items]                      
Net income (loss)                 $ 33,718 $ 130,294 $ (142,052)
Add: Noncontrolling interest in consolidated joint ventures                 1,018 651 1,044
Deduct: Redeemable noncontrolling interest                 (8,840)    
Deduct: Redemption value adjustment of redeemable noncontrolling interests                 (20,025)    
Net income (loss) available to common shareholders for basic earnings per share                 $ 5,871 $ 130,945 $ (141,008)
Weighted average common units                 100,410 100,245 100,222
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 $ 1.31 $ (1.41)