Annual report pursuant to Section 13 and 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Earnings Per Share Tables - Diluted Computation Of EPS) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]                      
Income (loss) from continuing operations attributable to common shareholders                 $ (125,752) $ 28,567 $ (77,028)
Add (deduct): Noncontrolling interest in Operating Partnership $ (3,795) $ (15,530) $ 4,383 $ (314) $ (1,152) $ 248 $ 6,514 $ (2,008) (15,256) 3,602 (10,459)
Income (loss) from continuing operations for diluted earnings per share                 (141,008) 32,169 (87,487)
Income from discontinued operations for diluted earnings per share                     70,628
Net income (loss) for diluted earnings per share                 $ (141,008) $ 32,169 $ (16,859)
Weighted average common shares                 100,222 100,041 99,785
Income (loss) from continuing operations available to common shareholders                 $ (1.41) $ 0.32 $ (0.88)
Income from discontinued operations available to common shareholders                     0.71
Net income (loss) available to common shareholders $ (0.35) $ (1.42) $ 0.40 $ (0.03) $ (0.10) $ 0.02 $ 0.58 $ (0.17) $ (1.41) $ 0.32 $ (0.17)