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)

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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 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net income (loss)                 $ 130,294 $ (142,052) $ 31,391
Add: Noncontrolling interest in consolidated joint ventures $ 191 $ 65 $ (311) $ 706 $ 462 $ (281) $ 373 $ 490 651 1,044 778
Add (deduct): Noncontrolling interest in Operating Partnership (1,774) 999 (5,662) (7,284) 3,795 15,530 (4,383) 314 (13,721) 15,256 (3,602)
Net income (loss) available to common shareholders $ 15,181 $ (8,541) $ 48,393 $ 62,191 $ (31,718) $ (126,892) $ 35,379 $ (2,521) $ 117,224 $ (125,752) $ 28,567
Weighted average common shares                 89,746 89,291 88,727
Net income (loss) available to common shareholders $ 0.17 $ (0.10) $ 0.54 $ 0.69 $ (0.35) $ (1.42) $ 0.40 $ (0.03) $ 1.31 $ (1.41) $ 0.32
Mack-Cali Realty LP [Member]                      
Net income (loss)                 $ 130,294 $ (142,052) $ 31,391
Add: Noncontrolling interest in consolidated joint ventures $ 191 $ 65 $ (311) $ 706 $ 462 $ (281) $ 373 $ 490 651 1,044 778
Net income (loss) available to common shareholders $ 16,955 $ (9,540) $ 54,055 $ 69,475 $ (35,513) $ (142,422) $ 39,762 $ (2,835) $ 130,945 $ (141,008) $ 32,169
Weighted average common units                 100,245 100,222 99,999
Net income (loss) available to common shareholders $ 0.17 $ (0.10) $ 0.54 $ 0.69 $ (0.35) $ (1.42) $ 0.40 $ (0.03) $ 1.31 $ (1.41) $ 0.32