Organization - Additional Information (Details)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Properties
Ownership in operating partnership	32.87%	32.64%
Real Estate
Properties
Percentage of total assets that must consist of real estate assets per the Internal Revenue Code election to be treated as REIT	75.00%
Percentage of total gross income that must be derived from real estate per the Internal Revenue Code election to be treated as REIT	75.00%