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Lease Information - Additional Information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
a
lease
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 01, 2019
USD ($)
Operating Leased Assets [Line Items]        
Operating lease, term of contract (in years) 4 years 6 months      
Operating leases, earned overage rent revenue $ 200 $ 1,300    
Operating leases, earned overage rent revenue     $ 1,200  
Number of properties subject to lease | lease 9      
Area of land (in acres) | a 47      
Weighted-average remaining term of ground leases (in years) 52 years 2 months 12 days      
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PrepaidExpenseAndOtherAssets us-gaap:PrepaidExpenseAndOtherAssets    
Operating lease liability $ 11,716 $ 10,839    
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilities us-gaap:OtherLiabilities    
Incremental borrowing rate (as a percent) 5.86%      
Rent expense $ 1,900 $ 1,800    
Rent expense     $ 1,700  
Operating lease payments $ 1,800 $ 1,700    
Cumulative Effect, Period of Adoption, Adjustment        
Operating Leased Assets [Line Items]        
Operating lease, right-of-use asset       $ 27,000
Operating lease liability       $ 27,300
Minimum        
Operating Leased Assets [Line Items]        
Extension option (in years) 5 years      
Length of extension option (in years) 20 years      
Incremental borrowing rate (as a percent) 3.93%      
Maximum        
Operating Leased Assets [Line Items]        
Extension option (in years) 10 years      
Length of extension option (in years) 25 years      
Incremental borrowing rate (as a percent) 6.33%