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Subsequent Events (Details) - USD ($)
$ in Thousands
9 Months Ended
Oct. 29, 2019
Sep. 30, 2019
Sep. 30, 2018
Subsequent Event [Line Items]      
Amount invested   $ 33,661 $ 52,806
SmartStop Self Storage REIT | Subsequent Event      
Subsequent Event [Line Items]      
Amount invested $ 150,000    
Investment commitment $ 50,000    
Investment commitment, period 12 months    
Investment, preferred dividend rate 6.25%    
Period after which preferred stock dividend is subject to increase 5 years    
Period after which preferred stock is redeemable 5 years