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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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3 Months Ended | 31 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2015
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| 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 | 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 | 5,500,000 | 5,500,000 |
| Monthly cash investment without restriction, maximum | $ 5,000 |