Long Term Lease Obligations - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leases Disclosure [Line Items]
Minimum rental obligations	$ 176,000	$ 176,000	$ 173,000
Lease extension period	5 years
Percentage of annual increase in base rent	3.00%
Rent expense	850,600	850,000	945,000
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	2
Minimum
Leases Disclosure [Line Items]
Lease expiration year	2058
Maximum
Leases Disclosure [Line Items]
Lease expiration year	2068