Annual report pursuant to Section 13 and 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Reconciliation Of Shares Used In Basic EPS Calculation To Shares Used In Diluted EPS Calculation) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Reconciliation Of Shares Used In Basic EPS Calculation To Shares Used In Diluted EPS Calculation) (Details)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]      
Basic EPS shares 88,727us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 87,762us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 87,742us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Add: Operating Partnership - common units 11,272cli_CommonUnits 12,023cli_CommonUnits 12,180cli_CommonUnits
Restricted Stock Awards 42cli_RestrictedStockAwardsShares   74cli_RestrictedStockAwardsShares
Diluted EPS Shares 100,041us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 99,785us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 99,996us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding