Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Share Repurchase Program And Dividend Reinvestment And Stock Purchase Plan) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Share Repurchase Program And Dividend Reinvestment And Stock Purchase Plan) (Narrative) (Details) (USD $)
 9 Months Ended
Sep. 30, 2013
Mack Cali Realty Corporation Stockholders Equity [Line Items]  
Maximum percentage of outstanding share owned by REIT 50.00%
Date share repurchase program was initiated September 2012
Capacity of share repurchase program $ 150,000,000
Shares purchased and retired 394,625
Aggregate cost of stock repurchased 11,000,000
Capacity available for additional repurchase of outstanding common stock 139,000,000
Dividend Reinvestment And Stock Purchase Plan [Member]
  
Mack Cali Realty Corporation Stockholders Equity [Line Items]  
Common stock reserved for future issuance 5,500,000
Monthly cash investment without restriction, maximum $ 5,000