Quarterly report pursuant to Section 13 or 15(d)

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

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Mack-Cali Realty Corporation Stockholders' Equity (Restricted Stock Awards And TSR-Based Awards) (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended 12 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
item
Dec. 31, 2013
Sep. 30, 2014
Restricted Stock [Member]
Sep. 30, 2013
Restricted Stock [Member]
Sep. 30, 2014
Restricted Stock [Member]
Minimum [Member]
Sep. 30, 2014
Restricted Stock [Member]
Maximum [Member]
Sep. 12, 2012
Ratified Restricted Stock Awards [Member]
Sep. 30, 2014
Ratified Restricted Stock Awards [Member]
Dec. 31, 2013
Ratified Restricted Stock Awards [Member]
Sep. 30, 2014
Ratified Restricted Stock Awards [Member]
Minimum [Member]
Sep. 30, 2014
Ratified Restricted Stock Awards [Member]
Maximum [Member]
Sep. 12, 2012
Total Stockholder Return Based Awards [Member]
Sep. 30, 2014
Total Stockholder Return Based Awards [Member]
Dec. 31, 2013
Total Stockholder Return Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock compensation vesting period         1 year 7 years       5 years 7 years   4 years  
Unvested performance shares 42,000 63,933             63,933          
Number of executive officers who departed 2                          
Shares vested 183,214             109,667         357  
Shares granted and vested                         528  
Unvested restricted stock outstanding 178,816 153,560 [1] 304,816 351,592                    
Restricted stock awards unvested shares outstanding, performance contingent     210,000                      
Awards issued 208,589 [2]           319,667         5,160   1,032
Value of common stock received upon vesting of awards                         $ 1,000  
Shares issued                         45,062  
Total unrecognized compensation cost                         $ 1.6  
Total unrecognized compensation cost, period of recognition                         1 year 3 months 18 days  
[1] 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.
[2] 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 granted to two executive officers in connection with their departure effective March 31, 2014, which vested on April 1, 2014.