Quarterly report pursuant to Section 13 or 15(d)

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

v3.3.0.814
Mack-Cali Realty Corporation Stockholders' Equity (Restricted Stock Awards And Performance Share Units/TSR-Based Awards) (Narrative) (Details)
$ / shares in Units, $ in Millions
 9 Months Ended 12 Months Ended
Jun. 05, 2015
shares
May. 11, 2015
shares
Mar. 31, 2014
shares
Sep. 12, 2012
shares
Sep. 11, 2012
shares
Sep. 30, 2015
USD ($)
item
$ / shares
shares
Dec. 31, 2013
shares
Dec. 31, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of executive officers who departed | item           2    
Shares vested           249,795    
Unvested restricted stock outstanding           136,557   346,946
Shares granted           41,337    
Messr Hersh [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares vested   210,000            
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unvested restricted stock outstanding           99,006    
Restricted stock awards unvested shares outstanding, performance contingent           210,000    
Shares granted       319,667        
Restricted Stock [Member] | 2013 Incentive Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares granted 37,550.54              
Performance period           3 years    
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    
Ratified Restricted Stock Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares vested     109,667          
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           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           45,062    
Total unrecognized compensation cost | $           $ 2.5    
Total unrecognized compensation cost, period of recognition           1 year 10 months 24 days    
Total Stockholder Return Based Awards [Member] | Messr Hersh [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares vested   675            
Shares issued   41,811            
Performance Shares [Member] | Employee Severance [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares vested   84,000            
Shares granted and vested   126,000            
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%