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Investments in Unconsolidated Real Estate Ventures - Narrative (Details)
$ in Thousands
3 Months Ended
Feb. 02, 2018
USD ($)
Mar. 31, 2019
USD ($)
store
Jan. 01, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]        
Contributions to joint ventures | $   $ 40,843    
Number of operating stores acquired by joint ventures | store   1    
Number of stores acquired at the issuance of certificate of occupancy | store   6    
Storage Portfolio I LLC        
Schedule of Equity Method Investments [Line Items]        
Equity method ownership percentage   34.00% 34.00% 25.00%
Excess profit participation percentage   49.00% 49.00% 40.00%
Financing distribution | $ $ 47,944