Other Payables and Accruals (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Accounts Payable and Accrued Liabilities [Line Items]
Accrued staff costs	$ 557,191	$ 667,969
Other taxes payable	1,264,311	1,450,360
Construction cost payable	2,704,341	3,598,053
Other payables (note 9)	440,258	654,451
Other payables and accruals	$ 4,966,101	$ 6,370,833