Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Deferred Retirement Compensation Arrangements) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Deferred Retirement Compensation Arrangements) (Narrative) (Details) (USD $)
9 Months Ended
Sep. 30, 2012
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
Price per unit used to determine annual contribution amount $ 30.00
Period upon which stock units become payable following a triggering event 30 days
Messr Hersh [Member]
 
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
Amount of annual employer contribution to deferred retirement compensation $ 500,000
Messr Lefkowitz [Member]
 
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
Amount of annual employer contribution to deferred retirement compensation 160,000
Messr Thomas [Member]
 
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]  
Amount of annual employer contribution to deferred retirement compensation $ 100,000