Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments And Contingencies Disclosure [Abstract]
Term of lease period	50 years or more
Lease and Rental Expenses	$ 2,304,461	$ 2,195,835	$ 1,994,565
Sublease rental income	512,503	492,095	443,829
Total amount to be received in the future from non-cancellable subleases	$ 30,100,000