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ORGANIZATION (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 67 Months Ended 111 Months Ended
Oct. 03, 2014
USD ($)
shares
Jun. 30, 2020
USD ($)
numberOfProperties
numberOfLoans
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2020
USD ($)
numberOfProperties
numberOfLoans
shares
Jun. 30, 2019
USD ($)
shares
May 29, 2016
USD ($)
shares
Jun. 30, 2020
USD ($)
numberOfProperties
numberOfLoans
shares
Dec. 31, 2019
shares
Jan. 26, 2010
$ / shares
shares
Organizational Structure [Line Items]                  
Common stock, shares issued (in shares)   182,564,608   182,564,608     182,564,608 180,970,743  
Number or real estate loans receivable | numberOfLoans   1   1     1    
Issuance of common stock | $   $ 11,718 $ 12,974 $ 23,622 $ 26,471        
Redemptions of common stock | $   $ 3,243 $ 2,944 $ 6,292 $ 55,550        
Percent of total rental income from retail tenants   3.00%              
Private Placement                  
Organizational Structure [Line Items]                  
Issuance of common stock (in shares) 258,462                
Issuance of common stock | $ $ 2,400                
Office Properties                  
Organizational Structure [Line Items]                  
Number of real estate properties | numberOfProperties   18   18     18    
Mixed-use Office/Retail Property                  
Organizational Structure [Line Items]                  
Number of real estate properties | numberOfProperties   1   1     1    
  Common Stock                  
Organizational Structure [Line Items]                  
Issuance of common stock (in shares)   1,058,508 1,136,045 2,133,957 2,317,868 169,006,162      
Issuance of common stock | $   $ 10 $ 11 $ 21 $ 23 $ 1,700,000      
Shares of common stock sold under dividend reinvestment plan, shares             34,587,959    
Shares of common stock sold under dividend reinvestment plan, value | $             $ 356,200    
Redemptions of common stock (in shares)   278,382 245,178 540,092 4,840,160   29,029,189    
Redemptions of common stock | $   $ 2 $ 2 $ 5 $ 48   $ 317,700    
KBS Capital Advisors LLC                  
Organizational Structure [Line Items]                  
Common stock, shares issued (in shares)                 20,000
Common stock, purchase price per share (in dollars per share) | $ / shares                 $ 10.00
KBS Capital Advisors LLC |   Common Stock                  
Organizational Structure [Line Items]                  
Shares held by affiliate (in shares)   20,857   20,857     20,857    
KBS Limited Partnership III                  
Organizational Structure [Line Items]                  
Partnership interest in Operating Partnership       0.10%          
Partnership interest in the Operating Partnership and is its sole limited partner       99.90%