Mack-Cali Realty Corporation Stockholders' Equity (Earnings Per Share) (Narrative) (Details) - $ / shares |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2016 |
Mar. 31, 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 | 5,000 | 10,000 | |
| Dividends declared per common share | $ 0.15 | $ 0.15 | |
| Unvested restricted stock outstanding | 127,641 | 136,220 | |
| Unvested Restricted Stock [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Unvested restricted stock outstanding | 90,090 | 103,337 | |