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 $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]                      
Income from continuing operations available to common shareholders                 $ 40,932 $ 66,560 $ 54,831
Add: Noncontrolling interest in Operating Partnership (536) 1,803 1,426 2,986 2,185 2,903 2,405 2,415 5,679 9,908 9,102
Income from continuing operations for diluted earnings per share                 46,611 76,468 63,933
Income (loss) from discontinued operations for diluted earnings per share (6,121) 1,454 (203) 4,858 1,207 873 1,204 301 (12) 3,585 (2,232)
Net income available to common shareholders                 $ 46,599 $ 80,053 $ 61,701
Weighted average common shares                 99,996 98,962 92,477
Income from continuing operations available to common shareholders $ (0.05) $ 0.15 $ 0.11 $ 0.24 $ 0.17 $ 0.23 $ 0.19 $ 0.19 $ 0.47 $ 0.77 $ 0.69
Income (loss) from discontinued operations available to common shareholders $ (0.06) $ 0.01   $ 0.05 $ 0.01 $ 0.01 $ 0.01     $ 0.04 $ (0.02)
Net income available to common shareholders $ (0.11) $ 0.16 $ 0.11 $ 0.29 $ 0.18 $ 0.24 $ 0.20 $ 0.19 $ 0.47 $ 0.81 $ 0.67