Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Stock Compensation) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Stock Compensation) (Narrative) (Details) (USD $)
9 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Maximum [Member]
Sep. 30, 2012
Minimum [Member]
Sep. 30, 2012
Restricted Stock [Member]
Sep. 30, 2011
Restricted Stock [Member]
Sep. 30, 2012
Ratified Restricted Stock Awards [Member]
Maximum [Member]
Sep. 30, 2012
Ratified Restricted Stock Awards [Member]
Minimum [Member]
Sep. 30, 2012
Total Stockholder Return Based Awards [Member]
Jan. 31, 2013
Scenario, Forecast [Member]
Ratified Restricted Stock Awards [Member]
Jan. 31, 2013
Scenario, Forecast [Member]
Total Stockholder Return Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted Stock Award vesting period     7 years 1 year     7 years 5 years 5 years    
Unvested restricted stock outstanding 105,843 187,447     105,843 157,681          
Restricted stock awards unvested shares outstanding performance contingent         40,877            
Awards issued                   319,667 5,160
Value of common stock received upon vesting of awards                 $ 1,000