Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Narrative) (Details)

v3.7.0.1
Significant Accounting Policies (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2016
Apr. 05, 2017
Jan. 05, 2017
Significant Accounting Policies [Line Items]            
Capitalized development and construction salaries and other related costs $ 600,000   $ 600,000      
Construction, tenant improvement, and development in-progress $ 367,200,000 $ 361,100,000   $ 361,100,000    
Maximum period after cessation of major construction activity that projects are considered complete 1 year          
Threshold of investment value for discontinuation of equity method accounting $ 0          
Amortization of deferred financing costs 1,103,000   1,169,000      
Loss from extinguishment of debt, net (239,000)          
Write off of unamortized deferred financing costs 239,000          
Deferred leasing costs 1,042,000   780,000      
Deferred tax asset 16,900,000          
Income taxes, material adjustment amount $ 0          
Common stock, shares outstanding 89,844,752 89,696,713   89,696,713   89,696,824
Common units outstanding 10,339,444 10,488,105   10,488,105   10,488,105
LTIP units outstanding 652,554 657,373   657,373   657,373
Distributions payable, record date Apr. 05, 2017     Jan. 05, 2017    
Distributions payable, approved date Mar. 14, 2017 Dec. 13, 2016        
Common stock dividends and common unit distributions per share $ 0.15 $ 0.15        
Restricted stock expense $ 1,053,000   $ 785,000      
Distributions payable, pay date Apr. 13, 2017 Jan. 13, 2017        
Subsequent Event [Member]            
Significant Accounting Policies [Line Items]            
Common stock, shares outstanding         89,874,940  
Common units outstanding         10,339,443  
LTIP units outstanding         652,554  
Mack-Cali Realty LP [Member]            
Significant Accounting Policies [Line Items]            
Loss from extinguishment of debt, net $ (239,000)