Business of Organization - Additional Information (Details) - property	Jun. 30, 2019	Dec. 31, 2018
Business And Organization [Line Items]
Percentage of Operating Partnership held	71.40%	74.50%
Operating Property
Business And Organization [Line Items]
Number of real estate properties	54
Development Property
Business And Organization [Line Items]
Number of real estate properties	8
General Partner
Business And Organization [Line Items]
Percentage of Operating Partnership held	0.10%