Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share/Unit) (Narrative) (Details) - $ / shares
|
12 Months Ended |
|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Anti-dilutive securities excluded from the computation of earnings per share |
|
|
405,000
|
|
| Unvested restricted stock outstanding |
108,318
|
145,278
|
136,220
|
346,946
|
| Dividends declared per common share |
$ 0.75
|
$ 0.60
|
$ 0.60
|
|
| Mack-Cali Realty LP [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Anti-dilutive securities excluded from the computation of earnings per share |
|
|
405,000
|
|
| Distribution declared per common unit |
$ 0.75
|
$ 0.60
|
$ 0.60
|
|
| Unvested Restricted Stock [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Unvested restricted stock outstanding |
95,801
|
120,245
|
98,669
|
|
| Unvested Restricted Stock [Member] | Mack-Cali Realty LP [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Unvested restricted stock outstanding |
95,801
|
120,245
|
98,669
|
|