Annual report pursuant to Section 13 and 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Restricted Stock Awards And Performance Share Units/TSR-Based Awards) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Restricted Stock Awards And Performance Share Units/TSR-Based Awards) (Narrative) (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Jun. 05, 2015
shares
May. 11, 2015
shares
Sep. 12, 2012
shares
Dec. 31, 2015
USD ($)
item
$ / shares
shares
Dec. 31, 2014
shares
Dec. 31, 2013
shares
Dec. 31, 2012
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unvested performance shares         42,000 63,933  
Number of executive officers who departed | item       2      
Shares vested   84,000   250,132 183,214 149,463  
Shares granted and vested   126,000          
Unvested restricted stock outstanding       136,220 346,946 153,560 134,328
Shares granted       41,337 [1] 376,719 [2],[3],[4] 168,841 [5],[6]  
Messr Hersh [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unvested performance shares         126,000    
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock awards unvested shares outstanding, performance contingent       210,000      
Restricted Stock [Member] | 2013 Incentive Stock Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock compensation vesting period       3 years      
Shares granted 37,550.54            
Restricted Stock [Member] | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock compensation vesting period       1 year      
Restricted Stock [Member] | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock compensation vesting period       7 years      
Unvested Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unvested restricted stock outstanding       98,669 136,946 409,294  
Ratified Restricted Stock Awards [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares vested       109,667      
Shares granted     319,667        
Ratified Restricted Stock Awards [Member] | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock compensation vesting period       5 years      
Ratified Restricted Stock Awards [Member] | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock compensation vesting period       7 years      
Total Stockholder Return Based Awards [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock compensation vesting period       4 years      
Shares vested   675   357      
Shares granted and vested       528      
Shares granted     5,160   1,032    
Value of common stock received upon vesting of awards | $ / shares       $ 1,000      
Shares issued   41,811   45,062      
Total unrecognized compensation cost | $       $ 2.0      
Total unrecognized compensation cost, period of recognition       1 year 9 months 18 days      
Performance Shares [Member] | 2013 Incentive Stock Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted 112,651.64            
Performance period       3 years      
Performance Shares [Member] | Minimum [Member] | 2013 Incentive Stock Plan [Member] | Three Years Period Award [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of shares vested 0.00%            
Performance Shares [Member] | Maximum [Member] | 2013 Incentive Stock Plan [Member] | Three Years Period Award [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of shares vested 150.00%            
[1] Included in the 41,337 Restricted Stock Awards granted in 2015 were 37,551 awards granted to the Company's two executive officers, Mitchell E. Rudin and Michael J. DeMarco.
[2] Included in the 376,719 Restricted Stock Awards granted in 2014 were 8,211 awards granted to the Company's two executive officers, Anthony Krug and Gary Wagner.
[3] Includes 126,000 Performance Shares which were legally granted in 2013 for which future performance goals had not yet been set by the Committee. These awards were not considered granted for accounting purposes until these goals are set. These were considered granted in 2014 for accounting purposes in connection with the announcement of the departure of Mitchell E. Hersh in the fourth quarter 2014.
[4] Includes 42,000 Performance Shares which were legally granted in 2013 for which the 2014 performance goals were set by the Committee on March 31, 2014. Also includes 87,734 shares which were additionally considered granted for accounting purposes to two executive officers in connection with their departure effective March 31, 2014, which vested on April 1, 2014.
[5] Included in the 168,841 Restricted Stock Awards granted in 2013 were 106,933 awards granted to the Company's then four executive officers, Mitchell E. Hersh, Barry Lefkowitz, Roger W. Thomas and Anthony Krug.
[6] Includes 63,933 Performance Shares which were legally granted in 2013 for which the 2013 performance goals were not met, which may be earned if subsequent years' performance goals are met.