Annual report pursuant to Section 13 and 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Deferred Stock Compensation Plan For Directors) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Deferred Stock Compensation Plan For Directors) (Narrative) (Details)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]      
Deferred stock units earned 14,886 12,563 15,082
Deferred stock units outstanding 98,009 84,236  
Maximum percentage of retainer fee that directors may defer 100.00%