Unconsolidated Affiliates and Noncontrolling Interests - Financings of Unconsolidated Affiliates (Details) - Parkdale Self Storage, LLC $ in Thousands	6 Months Ended
Jun. 30, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Stated interest rate (as a percent)	5.25%
Total Outstanding	$ 6,500
Company's Ownership Interest (as a percent)	50.00%
Maximum guarantee (as a percent)	100.00%
LIBOR
Schedule of Equity Method Investments [Line Items]
Basis spread on variable rate (as a percent)	2.80%

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