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Subsequent Events - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 13, 2020
USD ($)
Asset
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Subsequent Event [Line Items]          
Aggregate payments to purchase investment in real estate debt       $ 1,177,967 $ 1,623,503
Proceeds from issuance of common stock       6,014,033 4,913,617
Stock repurchased value   $ 332,891 $ 55,870 $ 1,148,122 $ 161,537
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Aggregate payments to acquire real estate, exclusive of closing costs $ 801,800        
Aggregate payments to purchase investment in real estate debt 35,900        
Proceeds from issuance of common stock 918,000        
Subsequent Event [Member] | Common Stock [Member]          
Subsequent Event [Line Items]          
Stock repurchased value $ 103,200        
Simply Self Storage Acquisition [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Number of storage assets to be acquired | Asset 101        
Expected payment to acquire storage assets, exclusive of closing costs $ 1,200,000