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Equity - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 24 Months Ended 30 Months Ended 68 Months Ended
Jan. 15, 2020
USD ($)
shares
Apr. 30, 2020
shares
Mar. 31, 2020
USD ($)
vote
$ / shares
shares
Sep. 30, 2019
USD ($)
shares
Mar. 31, 2019
$ / shares
shares
Sep. 30, 2019
Sep. 30, 2019
USD ($)
Mar. 31, 2020
USD ($)
vote
shares
Mar. 31, 2020
USD ($)
vote
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
shares
Jun. 30, 2015
shares
Class of Stock [Line Items]                        
Number of shares outstanding (in shares)     229,671,555         229,671,555 229,671,555 227,853,720    
Proceeds from sale of shares | $             $ 2,800,000,000 $ 2,800,000,000        
Shares issued | $ [1]     $ 230,000         230,000 $ 230,000 $ 228,000    
Share Redemption Program                        
Class of Stock [Line Items]                        
Minimum ownership balance (shares) | $     $ 2,500         2,500 2,500      
Minimum holding period for stock to be redeemed from stockholder by the Company     1 year                  
Quarterly Cap | $     $ 105,700,000         105,700,000 105,700,000      
Signature Office REIT Merger                        
Class of Stock [Line Items]                        
Number of shares issued (shares)                       43,772,611.05983
Distribution Reinvestment Plan                        
Class of Stock [Line Items]                        
Period for written notice     10 days                  
Shares issued | $     $ 305,800,000         305,800,000 305,800,000 $ 293,700,000    
DRP issued | $     $ 105,700,000         $ 105,700,000 $ 105,700,000      
Maximum | Share Redemption Program                        
Class of Stock [Line Items]                        
Aggregate redemption of Company's shares (percent)     5.00%     5.00%            
RSUs                        
Class of Stock [Line Items]                        
RSU's issued (in shares) 589,248                      
Installment vesting of RSUs (percent) 25.00%                      
Fair value of grants issued | $ $ 5,500,000                      
Total Forfeitures     535                  
Common Class T                        
Class of Stock [Line Items]                        
Number of votes each share is entitled to | vote     1         1 1      
Number of shares outstanding (in shares)     553,622         553,622 553,622      
Common Class S                        
Class of Stock [Line Items]                        
Number of votes each share is entitled to | vote     1         1 1      
Number of shares outstanding (in shares)     1,798         1,798 1,798      
Common Class D                        
Class of Stock [Line Items]                        
Number of votes each share is entitled to | vote     1         1 1      
Number of shares outstanding (in shares)     40,549         40,549 40,549      
Common Class I                        
Class of Stock [Line Items]                        
Number of votes each share is entitled to | vote     1         1 1      
Number of shares outstanding (in shares)     1,899,735         1,899,735 1,899,735      
Common Class A                        
Class of Stock [Line Items]                        
Number of votes each share is entitled to | vote     1         1 1      
Number of shares outstanding (in shares)     24,223,758         24,223,758 24,223,758      
Common Class AA                        
Class of Stock [Line Items]                        
Number of votes each share is entitled to | vote     1         1 1      
Number of shares outstanding (in shares)     47,066,472         47,066,472 47,066,472      
Common Class AAA                        
Class of Stock [Line Items]                        
Number of votes each share is entitled to | vote     1         1 1      
Number of shares outstanding (in shares)     950,852         950,852 950,852      
Common Class E                        
Class of Stock [Line Items]                        
Number of votes each share is entitled to | vote     1         1 1      
Number of shares outstanding (in shares)     154,934,769         154,934,769 154,934,769      
Excess of qurterly cap limitation (in shares)       2,872,488                
Excess of quarterly cap limitation | $       $ 27,400,000                
Percentage of redemption requests not redeemed (percent)       25.00%                
Contingent right to common stock represented by each RSU (shares) 1                      
Common Stock                        
Class of Stock [Line Items]                        
Number of shares outstanding (in shares)     229,671,555   174,981,549     229,671,555 229,671,555 227,853,720 174,278,341  
Number of shares issued (in shares)     433,328                  
Stock redeemed during period (in shares)                 24,778,877      
Stock redeemed, value | $                 $ 233,800,000      
Weighted average price per share (in dollars per share) | $ / shares                 $ 9.44      
Redemption requests that were not redeemed (shares)     4,664,765                  
Common Stock | Share Redemption Program                        
Class of Stock [Line Items]                        
Stock redeemed during period (in shares)     548,312.16   0              
Weighted average price per share (in dollars per share) | $ / shares     $ 9.32   $ 0.00              
Subsequent Event | Common Class E                        
Class of Stock [Line Items]                        
Number of shares issued (in shares)   174,981,547                    
[1] See Note 9, Equity, for the number of shares outstanding of each class of common stock as of March 31, 2020.