Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of Stock Option Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
|
| Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital [Abstract] | ||||
| Shares Under Options - Outstanding, beginning balance | 800,000 | 800,000 | 800,000 | 800,000 |
| Shares Under Options - Outstanding, ending balance | 800,000 | 800,000 | 800,000 | 800,000 |
| Shares Under Options - Options exercisable | 800,000 | 800,000 | 800,000 | 800,000 |
| Shares Under Options - Available for grant | 750,000 | 1,488,356 | 750,000 | 1,488,356 |
| Weighted Average Exercise Price - Outstanding, beginning balance | $ 17.31 | $ 17.31 | $ 17.31 | $ 17.31 |
| Weighted Average Exercise Price - Outstanding, ending balance | $ 17.31 | $ 17.31 | $ 17.31 | $ 17.31 |
| Aggregate Intrinsic Value, Outstanding, beginning balance | $ 3,912 | $ 1,824 | $ 3,400 | |
| Aggregate Intrinsic Value, Outstanding, ending balance | $ 4,784 | $ 2,376 | $ 4,784 | $ 2,376 |
| Outstanding stock option price | $ 17.31 | $ 17.31 | $ 17.31 | $ 17.31 |