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Summary of Significant Accounting Policies - Investment in Unconsolidated Real Estate Entities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]      
Impairment loss on investment in unconsolidated real estate entities $ 15,282 $ 0 $ 0
Inland Joint Venture      
Related Party Transaction [Line Items]      
Impairment loss on investment in unconsolidated real estate entities $ 15,300