CERTAIN RISKS AND CONCENTRATION - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Concentration Risk [Line Items]
Number of customers with greater than ten percent revenue	2	2	2
Number of customers with greater than ten percent of total accounts receivable	2	1
Percentage of total accounts receivables		33.60%
Customer 1
Concentration Risk [Line Items]
Percentage of revenue by customer	31.70%	25.30%	12.70%
Percentage of total accounts receivables	48.50%
Customer 2
Concentration Risk [Line Items]
Percentage of revenue by customer	12.90%	10.60%	11.40%
Percentage of total accounts receivables	14.60%