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Long Term Lease Obligations - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2015
USD ($)
property
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
Leases Disclosure [Line Items]        
Minimum rental obligations $ 176,000 $ 176,000 $ 176,000  
Lease extension period       5 years
Percentage of annual increase in base rent       3.00%
Rent expense $ 904,900 $ 840,800 $ 850,600  
90-year Ground Leasehold Interest        
Leases Disclosure [Line Items]        
Ground leasehold interest period 90 years      
Minimum annual lease rent over lease term $ 1      
99-year Ground Lease        
Leases Disclosure [Line Items]        
Ground leasehold interest period 99 years      
Minimum annual lease rent over lease term $ 1      
Percent of underlying land held under a 99-year ground lease 3.40%      
Flagship Center        
Leases Disclosure [Line Items]        
Number of developed parcels | property 2      
Minimum        
Leases Disclosure [Line Items]        
Lease expiration year 2058      
Maximum        
Leases Disclosure [Line Items]        
Lease expiration year 2068