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 - Basic 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 - Basic Computation Of EPS) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Stockolders Equity [Line Items]        
Net income (loss) $ (56,021) $ 1,689 $ 199,244 $ 53,878
Add (deduct): Noncontrolling interests in consolidated joint ventures 405 451 2,500 576
Add (deduct): Noncontrolling interests in Operating Partnership 6,159 167 (19,087) (4,574)
Add (deduct): Redeemable noncontrolling interests (6,471) (3,785) (16,144) (9,573)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders (3,025) (2,666) (22,936) (8,799)
Net income (loss) available to common shareholders for basic earnings per share $ (58,953) $ (4,144) $ 143,577 $ 31,508
Weighted average common shares 90,584 90,468 90,539 90,355
Net income (loss) available to common shareholders $ (0.65) $ (0.05) $ 1.59 $ 0.35
Mack-Cali Realty LP [Member]        
Stockolders Equity [Line Items]        
Net income (loss) $ (56,021) $ 1,689 $ 199,244 $ 53,878
Add (deduct): Noncontrolling interests in consolidated joint ventures 405 451 2,500 576
Add (deduct): Redeemable noncontrolling interests (6,471) (3,785) (16,144) (9,573)
Add (deduct): Redemption value adjustment of redeemable noncontrolling interests attributable to common shareholders (3,359) (2,968) (25,477) (9,798)
Net income (loss) available to common shareholders for basic earnings per share $ (65,446) $ (4,613) $ 160,123 $ 35,083
Weighted average common units 100,560 100,712 100,607 100,606
Net income (loss) available to common shareholders $ (0.65) $ (0.05) $ 1.59 $ 0.35