Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands |
Jun. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Allowance for doubtful accounts receivable | $ 1,145 | $ 1,335 |
| Common stock, par value per share | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 190,000,000 | 190,000,000 |
| Common stock, shares outstanding | 89,913,919 | 89,696,713 |
| Mack-Cali Realty LP [Member] | ||
| Allowance for doubtful accounts receivable | $ 1,145 | $ 1,335 |
| General partner common units outstanding | 89,913,919 | 89,696,713 |
| Limited partner common units outstanding | 10,438,855 | 10,488,105 |