Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Stock Options Plans) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Stock Options Plans) (Narrative) (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 05, 2015
item
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
shares
Dec. 31, 2014
May. 31, 2013
shares
May. 31, 2004
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock option terms       10 years        
Weighted average remaining contractual life       9 years 8 months 12 days   4 years 10 months 24 days    
Share price | $ / shares $ 17.31 $ 3.06   $ 3.06        
Options exercised       0 0      
Stock options expense | $   $ 185,000 $ 1,000 $ 248,000 $ 3,000      
Shares under options - Granted 800,000     800,000        
Common stock trade share price | $ / shares $ 25.00              
Annual installments | item 3              
Exercisable period       10 years        
Common stock trading days       30 days        
Three Equal Annual Installment [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares under options - Granted 400,000              
Common Stock Trades [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares under options - Granted 400,000              
2013 Incentive Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Reserved stocks for issuance             4,600,000  
2004 Incentive Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Reserved stocks for issuance               2,500,000
Shares issued   0   0        
Employee And Director Plan [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Reserved stocks for issuance   2,700,000   2,700,000        
Employee And Director Plan [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Reserved stocks for issuance   4,350,000   4,350,000        
2000 Employee Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exercisable time period       5 years        
2000 Employee Plan [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Reserved stocks for issuance   2,500,000   2,500,000        
2000 Employee Plan [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Reserved stocks for issuance   4,000,000   4,000,000        
2000 Director Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exercisable time period       1 year        
2000 Director Plan [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Reserved stocks for issuance   200,000   200,000        
2000 Director Plan [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Reserved stocks for issuance   350,000   350,000