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 | ||
|---|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
Dec. 31, 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 | |
| Shares Under Options - Outstanding, ending balance | 800,000 | 800,000 | |
| Shares Under Options - Options exercisable | 800,000 | 800,000 | |
| Shares Under Options - Available for grant | 42,011 | 750,000 | |
| Weighted Average Exercise Price - Outstanding, beginning balance | $ 17.31 | $ 17.31 | |
| Weighted Average Exercise Price - Outstanding, ending balance | 17.31 | $ 17.31 | |
| Aggregate intrinsic value | $ 3,912 | $ 1,824 | |
| Outstanding stock option price | $ 17.31 | $ 17.31 | |