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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS Subsequent to year end the Company has purchased five stores for a total of $69,852. On February 2, 2018, the Company and Teachers Insurance and Annuity ("TIAA") entered into the Third Amended and Restated Limited Liability Company Agreement of Storage Portfolio I LLC (as amended, the "SP I LLC Agreement"). The amendment to the SP I LLC Agreement is deemed effective as of January 1, 2018. Under the SP I LLC Agreement, the joint venture was recapitalized and the Company's ownership percentage of the SP I joint venture increased to 34.0%. Additionally, the Company's excess profit participation percentage increased to 49.0%.