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Noncontrolling Interest Represented by Preferred Operating Partnership Units - Additional Information (Details)
1 Months Ended 9 Months Ended
Apr. 18, 2017
Apr. 17, 2017
Jun. 25, 2007
USD ($)
Dec. 31, 2014
USD ($)
Oct. 31, 2014
USD ($)
shares
Jun. 30, 2007
USD ($)
Sep. 30, 2018
USD ($)
shares
$ / shares
Dec. 31, 2017
USD ($)
Noncontrolling Interest [Line Items]                
Note receivable from noncontrolling interest represented by Preferred Operating Partnership units             $ 119,735,000 $ 120,230,000
Series A Units                
Noncontrolling Interest [Line Items]                
Fixed priority return on preferred OP units, amount         $ 101,700,000 $ 101,700,000    
Fixed priority return on preferred OP units, stated return rate 2.30% 5.00%       2.30%    
Fixed priority return on preferred OP units, liquidation value           $ 115,000,000    
Series B Units                
Noncontrolling Interest [Line Items]                
Liquidation value (in dollars per share) | $ / shares             $ 25  
Fixed liquidation value             $ 41,902,000  
Annual rate of return (as a percent)             6.00%  
Series C Units                
Noncontrolling Interest [Line Items]                
Note receivable from noncontrolling interest represented by Preferred Operating Partnership units       $ 20,230,000     $ 19,735,000 $ 20,230,000
Note receivable interest rate       5.00%        
Liquidation value (in dollars per share) | $ / shares             $ 42.1  
Fixed liquidation value             $ 29,639,000  
Quarterly distribution per preferred OP unit payable above quarterly distribution for common OP Unit (in dollars per share) | $ / shares             $ 0.18  
Period from date of issuance after which preferred OP units will become redeemable at the option of the holder             1 year  
Preferred OP units conversion ratio (in shares) | shares             0.9145  
Series D Units                
Noncontrolling Interest [Line Items]                
Liquidation value (in dollars per share) | $ / shares             $ 25,000  
Fixed liquidation value             $ 92,063  
Series D Units | Minimum                
Noncontrolling Interest [Line Items]                
Annual rate of return (as a percent)             3.00%  
Series D Units | Maximum                
Noncontrolling Interest [Line Items]                
Annual rate of return (as a percent)             5.00%  
Operating Partnership Holders of A Units | Series A Units                
Noncontrolling Interest [Line Items]                
Maximum number of preferred OP units converted prior to the maturity date of the loan (in units) | shares         114,500      
Note receivable from noncontrolling interest represented by Preferred Operating Partnership units     $ 100,000,000       $ 100,000,000  
Note receivable interest rate 2.10%   4.90%