Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2017
Significant Accounting Policies [Line Items]  
Estimated Useful Lives Of Assets

Leasehold interests

Remaining lease term

Buildings and improvements

5 to 40 years

Tenant improvements

The shorter of the term of the



related lease or useful life

Furniture, fixtures and equipment

5 to 10 years



Mack-Cali Realty LP [Member]  
Significant Accounting Policies [Line Items]  
Estimated Useful Lives Of Assets

Leasehold interests

Remaining lease term

Buildings and improvements

5 to 40 years

Tenant improvements

The shorter of the term of the



related lease or useful life

Furniture, fixtures and equipment

5 to 10 years