Quarterly report pursuant to Section 13 or 15(d)

Mortgage Notes Payable and Credit Facility - Company's Mortgage Notes Payable and Line of Credit (Detail)

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Mortgage Notes Payable and Credit Facility - Company's Mortgage Notes Payable and Line of Credit (Detail)
9 Months Ended
Oct. 27, 2017
Sep. 30, 2018
USD ($)
property
Sep. 18, 2018
USD ($)
Jul. 23, 2018
USD ($)
Apr. 18, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]            
Encumbered properties | property   99        
Total   $ 542,084,000       $ 542,627,000
LIBOR            
Debt Instrument [Line Items]            
Spread on LIBOR (as percent) 2.75%          
Revolving credit facility            
Debt Instrument [Line Items]            
Encumbered properties | property   32        
Total   $ 30,334,000       20,715,000
Fixed rate mortgage loans            
Debt Instrument [Line Items]            
Encumbered properties | property   49        
Carrying value   $ 380,620,000       383,189,000
Variable rate mortgage loans            
Debt Instrument [Line Items]            
Encumbered properties | property   18        
Carrying value   $ 61,115,000 $ 3,600,000.0 $ 4,000,000.0 $ 13,000,000.0 69,302,000
Variable rate mortgage loans | LIBOR            
Debt Instrument [Line Items]            
Spread on LIBOR (as percent)   2.25%        
Mortgage notes payable            
Debt Instrument [Line Items]            
Encumbered properties | property   67        
Carrying value   $ 441,735,000        
Premiums and discounts (net)   (318,000)       (281,000)
Deferred financing costs, net   (4,271,000)       (4,830,000)
Total   $ 437,146,000       447,380,000
Variable rate revolving credit facility | Revolving credit facility            
Debt Instrument [Line Items]            
Encumbered properties | property   32        
Carrying value   $ 30,900,000       21,400,000
Deferred financing costs, net   $ (566,000)       (685,000)
Scheduled maturity dates   Oct. 27, 2021        
Variable rate revolving credit facility | Revolving credit facility | LIBOR            
Debt Instrument [Line Items]            
Spread on LIBOR (as percent)   1.75%        
Variable rate term loan facility            
Debt Instrument [Line Items]            
Carrying value   $ 75,000,000       75,000,000
Scheduled maturity dates   Oct. 27, 2022        
Variable rate term loan facility | LIBOR            
Debt Instrument [Line Items]            
Spread on LIBOR (as percent)   1.70%        
Total term loan, net            
Debt Instrument [Line Items]            
Deferred financing costs, net   $ (396,000)       (468,000)
Total   $ 74,604,000       $ 74,532,000