Quarterly report pursuant to Section 13 or 15(d)

Mortgage Notes Payable and Credit Facility - Mortgages Notes Payable (Detail)

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Mortgage Notes Payable and Credit Facility - Mortgages Notes Payable (Detail)
$ in Thousands
6 Months Ended
Oct. 27, 2017
Jun. 30, 2018
USD ($)
property
Jun. 30, 2017
USD ($)
property
Debt Instrument [Line Items]      
Debt Repaid   $ 21,998 $ 40,573
Number of properties acquired | property   1 1
LIBOR      
Debt Instrument [Line Items]      
Interest Rate on Variable Rate Debt Repaid 2.75%    
Variable rate mortgage loans      
Debt Instrument [Line Items]      
Debt Repaid   $ 6,738  
Variable rate mortgage loans | LIBOR      
Debt Instrument [Line Items]      
Interest Rate on Variable Rate Debt Repaid   2.25%  
Variable rate mortgage loans | LIBOR | Weighted average      
Debt Instrument [Line Items]      
Interest Rate on Variable Rate Debt Repaid   2.25%  
Fixed rate mortgage loans      
Debt Instrument [Line Items]      
Debt Repaid   $ 9,444  
Stated interest rate (as percent)   5.75%  
New Fixed Rate Mortgage Notes Payable      
Debt Instrument [Line Items]      
Stated interest rate (as percent)   4.58%  
Debt Issued   $ 9,380  
Interest rate swap | New Fixed Rate Mortgage Notes Payable      
Debt Instrument [Line Items]      
Stated interest rate (as percent)   4.58%