Other Payables and Accruals (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Accounts Payable and Accrued Liabilities [Line Items]
Accrued staff costs	$ 620,126	$ 763,430
Other taxes payable	3,030,667	1,768,702
Construction cost payable	1,798,227	1,958,204
Research and development costs payable	137,350	0
Other payables	428,044	447,068
Other payables and accruals	$ 6,014,414	$ 4,937,404