Quarterly report pursuant to Section 13 or 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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]        
Net income (loss) available to common shareholders $ (126,892) $ 1,982 $ (94,034) $ 37,807
Add (deduct): Noncontrolling interest in Operating Partnership (15,530) 248 (11,461) 4,754
Net income (loss) for diluted earnings per share $ (142,422) $ 2,230 $ (105,495) $ 42,561
Weighted average common shares 100,172 100,052 100,236 100,014
Net income available to common unitholders $ (1.42) $ 0.02 $ (1.05) $ 0.43