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Merger With Tier REIT, Inc. (Additional Information) (Details)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Jun. 14, 2019
USD ($)
shares
Mar. 25, 2019
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Business Acquisition [Line Items]        
Reverse stock split ratio 250.00      
TIER        
Business Acquisition [Line Items]        
Stock conversation ratio   2.98    
Fair value of assets acquired and liabilities assumed $ 1,600.0      
Acquisition expenses     $ 1.0 $ 50.9
TIER | Rental property revenues        
Business Acquisition [Line Items]        
Amount reported in consolidated revenue     $ 52.1 $ 61.7
Former TIER Common Stockholders        
Business Acquisition [Line Items]        
Number of shares issued | shares 166