Organization and Description of Business (Details) - Operating partnership	Mar. 31, 2019	Dec. 31, 2018
Coresite Realty Corporation
Organization
Percentage of ownership interests held by the entity	75.90%	75.80%
Noncontrolling interests
Organization
Percentage of ownership interests held by others	24.10%	24.20%
Carlyle Group
Organization
Percentage of ownership interests held by others	24.10%