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Business and Organization (Details)
3 Months Ended 12 Months Ended 91 Months Ended
Feb. 02, 2015
USD ($)
shares
Mar. 31, 2018
USD ($)
employee
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Jan. 19, 2016
USD ($)
shares
May 10, 2018
USD ($)
Dec. 31, 2015
shares
Class of Stock [Line Items]            
Common stock, shares authorized (in shares) | shares   400,000,000 400,000,000      
Common stock, par value (in dollars per share) | $ / shares   $ 0.01 $ 0.01      
Preferred stock, shares authorized (in shares) | shares   50,000,000 50,000,000      
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.01 $ 0.01      
Proceeds from initial offering | $ $ 1,100,000,000          
Number of shares issued (in shares) | shares 108,600,000          
Follow-on public offering | $       $ 700,000,000    
Number of employees | employee   0        
Subsequent event            
Class of Stock [Line Items]            
Net proceeds from issuance of common stock | $         $ 2,000,000,000  
Dividend Reinvestment Plan            
Class of Stock [Line Items]            
Number of shares issued (in shares) | shares 2,000,000     4,200,000    
Shares available (in shares) | shares           30,000,000
Dividend Reinvestment Plan | Subsequent event            
Class of Stock [Line Items]            
Net proceeds from issuance of common stock | $         $ 210,100,000  
Follow-on Primary Offering            
Class of Stock [Line Items]            
Number of shares issued (in shares) | shares       64,900,000    
Primary Beneficiary            
Class of Stock [Line Items]            
Limited partnership interest in operating partnership   99.99%        
Advisor            
Class of Stock [Line Items]            
Non-controlling interest investment in operating partnership | $   $ 1,000 $ 1,000      
Special Unit Holder            
Class of Stock [Line Items]            
Non-controlling interest investment in operating partnership | $   $ 1,000 $ 1,000