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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stockolders Equity [Line Items]        
Net income (loss) $ 44,703 $ (9,605) $ 28,307 $ 113,530
Add (deduct): Noncontrolling interest in consolidated joint ventures 447 65 865 460
Add (deduct): Noncontrolling interest in Operating Partnership (4,413) 999 (2,412) (11,947)
Deduct: Redeemable noncontrolling interest (2,683)   (6,157)  
Deduct: Redemption value adjustment of redeemable noncontrolling interests (2,728)   (15,139)  
Net income (loss) available to common shareholders for basic earnings per share $ 35,326 $ (8,541) $ 5,464 $ 102,043
Weighted average common shares 90,023 89,755 89,997 89,739
Net income (loss) available to common shareholders $ 0.39 $ (0.10) $ 0.06 $ 1.14
Mack-Cali Realty LP [Member]        
Stockolders Equity [Line Items]        
Net income (loss) $ 44,703 $ (9,605) $ 28,307 $ 113,530
Add (deduct): Noncontrolling interest in consolidated joint ventures 447 65 865 460
Deduct: Redeemable noncontrolling interest (2,683)   (6,157)  
Deduct: Redemption value adjustment of redeemable noncontrolling interests (3,044)   (16,887)  
Net income (loss) available to common shareholders for basic earnings per share $ 39,423 $ (9,540) $ 6,128 $ 113,990
Weighted average common units 100,462 100,253 100,391 100,241
Net income (loss) available to common shareholders $ 0.39 $ (0.10) $ 0.06 $ 1.14