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Related Party Arrangements - Schedule of Joint Ventures (Details)
Sep. 30, 2019
Eclipse  
Related Party Transaction [Line Items]  
Ownership interest (as a percentage) 5.60%
Griffin-American  
Related Party Transaction [Line Items]  
Ownership interest (as a percentage) 14.30%
Colony NorthStar, Inc. | Eclipse  
Related Party Transaction [Line Items]  
Ownership interest (as a percentage) 5.60%
Colony NorthStar, Inc. | Griffin-American  
Related Party Transaction [Line Items]  
Ownership interest (as a percentage) 14.30%