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 $)
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)us-gaap_NetIncomeLoss $ (15,298)us-gaap_NetIncomeLoss
Add (deduct): Noncontrolling interest in Operating Partnership (314)us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable (2,008)us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable
Net loss for diluted earnings per share $ (2,835)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (17,306)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted average common shares 100,266us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 99,876us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net loss available to common unitholders $ (0.03)us-gaap_EarningsPerShareDiluted $ (0.17)us-gaap_EarningsPerShareDiluted