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Mack-Cali Realty Corporation Stockholders' Equity (Share Repurchase Program And Dividend Reinvestment And Stock Purchase Plan) (Narrative) (Details) (USD $)
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9 Months Ended |
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Sep. 30, 2013
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| 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 |
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Dividend Reinvestment And Stock Purchase Plan [Member]
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| 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 |