Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Share/Unit Repurchase Program And Dividend Reinvestment And Stock Purchase Plan) (Narrative) (Details) - USD ($) |
9 Months Ended | 12 Months Ended |
|---|---|---|
Sep. 30, 2019 |
Dec. 31, 2012 |
|
| 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 | |
| Proceeds from sale of common units | $ 11,000,000 | |
| 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 |
| X | ||||||||||
- Definition Date Share Repurchase Program was initiated. No definition available.
|
| X | ||||||||||
- Definition Monthly cash investment without restriction, maximum. No definition available.
|
| X | ||||||||||
- Definition Stockolders Equity [Line Items] No definition available.
|
| X | ||||||||||
- Definition Aggregate number of common shares reserved for future issuance. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The cash outflow to reacquire common and preferred stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The cash inflow from the issuance of common limited partners units during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of stock repurchase plan authorized. No definition available.
|
| X | ||||||||||
- Definition Amount remaining of a stock repurchase plan authorized. No definition available.
|
| X | ||||||||||
- Definition Number of shares that have been repurchased and retired during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|