Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Changes In Executive Officers) (Narrative) (Details)

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Commitments And Contingencies (Changes In Executive Officers) (Narrative) (Details) - USD ($)
 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Messr Krug [Member] | Maximum [Member]    
Commitments And Contingencies [Line Items]    
Period for continuation of health insurance   2 years
Messr Krug [Member] | Scenario, Forecast [Member]    
Commitments And Contingencies [Line Items]    
Severance benefits $ 1,312,500  
Prorated 2018 target bonus amount 93,750  
Messr Krug [Member] | Scenario, Forecast [Member] | Maximum [Member]    
Commitments And Contingencies [Line Items]    
COBRA payment 42,000  
Messr DeLorenzo [Member] | Maximum [Member]    
Commitments And Contingencies [Line Items]    
Period for continuation of health insurance   18 months
Messr DeLorenzo [Member] | Scenario, Forecast [Member]    
Commitments And Contingencies [Line Items]    
Severance benefits $ 500,000  
Messr DeLorenzo [Member] | Scenario, Forecast [Member] | Mack-Cali Realty LP [Member]    
Commitments And Contingencies [Line Items]    
Partial accelerated vesting shares 9,111  
Messr DeLorenzo [Member] | Scenario, Forecast [Member] | Maximum [Member]    
Commitments And Contingencies [Line Items]    
COBRA payment $ 42,000  
Time-Based Award [Member] | Messr Krug [Member] | Scenario, Forecast [Member] | Mack-Cali Realty LP [Member]    
Commitments And Contingencies [Line Items]    
Accelerated vesting shares 13,306  
Performance Shares [Member] | Messr Krug [Member] | Scenario, Forecast [Member] | Mack-Cali Realty LP [Member]    
Commitments And Contingencies [Line Items]    
Accelerated vesting shares 18,665  
Performance Shares [Member] | Messr DeLorenzo [Member] | Scenario, Forecast [Member] | Mack-Cali Realty LP [Member]    
Commitments And Contingencies [Line Items]    
Partial accelerated vesting shares 13,982