Annual report pursuant to Section 13 and 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)
12 Months Ended 40 Months Ended
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Stockolders Equity [Line Items]    
Date share repurchase program was initiated September 2012  
Capacity of share repurchase program $ 150,000,000 $ 150,000,000
Shares purchased and retired | shares   394,625
Aggregate cost of stock repurchased   $ 11,000,000
Capacity available for additional repurchase of outstanding common stock $ 139,000,000 $ 139,000,000
Dividend Reinvestment And Stock Purchase Plan [Member]    
Stockolders Equity [Line Items]    
Common stock reserved for future issuance | shares 5,500,000 5,500,000
Monthly cash investment without restriction, maximum $ 5,000