Provision for Income Tax (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
PRC income tax:
Current	$ 19,843,738	$ 20,555,465	$ 17,388,836
Deferred	(118,821)	175,379	(65,136)
Income Tax Expense (Benefit)	$ 19,724,917	$ 20,730,844	$ 17,323,700