Provision for Income Tax (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
PRC income tax:
Current	$ 4,802,892	$ 5,863,804	$ 15,045,973	$ 14,997,311
Deferred	(113,235)	(4,973)	(84,143)	(11,525)
Effective tax expense	$ 4,689,657	$ 5,858,831	$ 14,961,830	$ 14,985,786