Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Earnings Per Share) (Narrative) (Details) - $ / shares |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2015 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Anti-dilutive securities excluded from the computation of earnings per share | 0 | 405,000 | |||
| Dividends declared per common share | $ 0.15 | $ 0.15 | $ 0.45 | $ 0.45 | |
| Unvested restricted stock outstanding | 107,749 | 107,749 | 136,220 | ||
| Unvested Restricted Stock [Member] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Unvested restricted stock outstanding | 82,716 | 99,006 | 82,716 | 99,006 | |