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
Mar. 31, 2015
Mar. 31, 2014
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]    
Net loss available to common shareholders $ (2,521) $ (15,298)
Add (deduct): Noncontrolling interest in Operating Partnership (314) (2,008)
Net loss for diluted earnings per share $ (2,835) $ (17,306)
Weighted average common shares 100,266 99,876
Net loss available to common unitholders $ (0.03) $ (0.17)