Mack-Cali Realty Corporation Stockholders' Equity (Share Repurchase Program And Dividend Reinvestment And Stock Purchase Plan) (Narrative) (Details) - USD ($) |
6 Months Ended | 43 Months Ended |
|---|---|---|
Jun. 30, 2016 |
Mar. 31, 2016 |
|
| Stockolders Equity [Line Items] | ||
| 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] | ||
| Stockolders Equity [Line Items] | ||
| Common stock reserved for future issuance | 5,500,000 | |
| Monthly cash investment without restriction, maximum | $ 5,000 |