Annual report pursuant to Section 13 and 15(d)

Mortgage Notes Payable and Credit Facility - Additional Information (Detail)

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Mortgage Notes Payable and Credit Facility - Additional Information (Detail)
12 Months Ended
Jul. 02, 2019
USD ($)
Jan. 31, 2019
property
mortgage
Oct. 27, 2017
USD ($)
Oct. 05, 2015
USD ($)
Dec. 31, 2019
USD ($)
property
mortgage
Jul. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Oct. 26, 2017
USD ($)
Debt Instrument [Line Items]                
Number of properties collateralized in mortgage notes payable | property         116      
Fair value of mortgage notes payable outstanding         $ 466,100,000      
Long-term debt         626,594,000   $ 566,059,000  
Line of credit facility, maximum borrowing capacity $ 160,000,000.0   $ 75,000,000.0     $ 75,000,000.0   $ 25,000,000.0
Borrowings under revolving credit facility, net         $ 51,579,000   50,084,000  
Line of credit at an interest rate (as percent)         3.38%      
Weighted average interest rate on debt outstanding (as percent)         4.18%      
Mortgage notes payable                
Debt Instrument [Line Items]                
Number of mortgage notes payable | mortgage         54      
Number of properties collateralized in mortgage notes payable | property         70      
Net book value of collateralized mortgage properties         $ 671,600,000      
Collateral         $ 4,800,000      
Collateral (as percent)         1.10%      
Number of mortgages repaid | mortgage         1      
Number of properties collateralized | property         3      
Number of long-term mortgages issued | property         11      
Number of properties to issue collateralized mortgage notes payable | property         11      
Long-term debt         $ 453,739,000   $ 441,346,000  
Weighted average interest rate on debt outstanding (as percent)         4.49%      
Fixed rate mortgage loans                
Debt Instrument [Line Items]                
Number of properties collateralized in mortgage notes payable | property         58      
Number of mortgages repaid | mortgage   4            
Number of properties collateralized | property   8            
LIBOR                
Debt Instrument [Line Items]                
Spread on LIBOR (as percent)     2.75%          
Term loan facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity 160,000,000.0              
Revolving credit facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity $ 100,000,000.0         $ 85,000,000.0    
Line of credit                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity       $ 85,000,000.0        
Borrowings under revolving credit facility, net         $ 174,700,000      
Letters of credit, outstanding         12,000,000      
Line of credit facility, maximum additional amount drawn         $ 20,500,000      
Line of credit | Five year term loan facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity       $ 25,000,000.0        
Debt instrument term       5 years        
Line of credit | Term loan facility                
Debt Instrument [Line Items]                
Debt instrument term 5 years              
Line of credit | Revolving credit facility                
Debt Instrument [Line Items]                
Debt instrument term 4 years              
Debt instrument, fee $ 1,300,000              
Letter of credit                
Debt Instrument [Line Items]                
Weighted average interest rate on debt outstanding (as percent)         1.65%      
Minimum | Term loan facility | LIBOR                
Debt Instrument [Line Items]                
Spread on LIBOR (as percent) 2.50%              
Maximum | Term loan facility | LIBOR                
Debt Instrument [Line Items]                
Spread on LIBOR (as percent) 2.75%