Mack-Cali Realty Corporation Stockholders' Equity (Restricted Stock Awards And Performance Share Units/TSR-Based Awards) (Narrative) (Details)
$ / shares in Units, $ in Millions |
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3 Months Ended |
6 Months Ended |
12 Months Ended |
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Jun. 05, 2015
shares
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May. 11, 2015
shares
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Sep. 12, 2012
shares
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Sep. 11, 2012
shares
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Jun. 30, 2014
shares
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Jun. 30, 2015
USD ($)
item
$ / shares
shares
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Dec. 31, 2013
shares
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Dec. 31, 2014
shares
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of executive officers who departed | item |
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2
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| Shares vested |
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37,392
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| Unvested restricted stock outstanding |
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350,888
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346,946
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| Shares granted |
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41,337
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| Restricted Stock [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unvested restricted stock outstanding |
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313,337
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| Restricted stock awards unvested shares outstanding, performance contingent |
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210,000
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| Shares granted |
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319,667
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| Restricted Stock [Member] | 2013 Incentive Stock Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares granted |
37,550.54
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| Performance period |
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3 years
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| Restricted Stock [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock compensation vesting period |
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1 year
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| Restricted Stock [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock compensation vesting period |
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7 years
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| Ratified Restricted Stock Awards [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares vested |
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109,667
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| Ratified Restricted Stock Awards [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock compensation vesting period |
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5 years
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| Ratified Restricted Stock Awards [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock compensation vesting period |
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7 years
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| Total Stockholder Return Based Awards [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock compensation vesting period |
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4 years
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| Shares vested |
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357
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| Shares granted and vested |
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528
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| Shares granted |
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5,160
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1,032
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| Value of common stock received upon vesting of awards | $ / shares |
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$ 1,000
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| Shares issued |
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45,062
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| Total unrecognized compensation cost | $ |
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$ 3.1
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| Total unrecognized compensation cost, period of recognition |
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2 years
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| Performance Shares [Member] | Employee Severance [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares vested |
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84,000
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| Shares granted and vested |
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126,000
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| Performance Shares [Member] | 2013 Incentive Stock Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares granted |
112,651.64
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| Performance period |
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3 years
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| Performance Shares [Member] | Minimum [Member] | 2013 Incentive Stock Plan [Member] | Three Years Period Award [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percentage of shares vested |
0.00%
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| Performance Shares [Member] | Maximum [Member] | 2013 Incentive Stock Plan [Member] | Three Years Period Award [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Percentage of shares vested |
150.00%
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