CERTAIN RISKS AND CONCENTRATION - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2012 Entity	Sep. 30, 2011 Entity	Sep. 30, 2012 Entity	Sep. 30, 2011 Entity
Concentration Risk [Line Items]
Number of customers with greater than ten percent revenue	2	1	2	3
Number of customers with greater than ten percent of total accounts receivable	2	1	2	1
Customer 1
Concentration Risk [Line Items]
Percentage of revenue by customer	34.70%	34.10%	29.40%	24.90%
Percentage of total accounts receivables	45.30%	33.60%	45.30%	33.60%
Customer 2
Concentration Risk [Line Items]
Percentage of revenue by customer	14.70%		12.50%	12.20%
Percentage of total accounts receivables	11.60%		11.60%
Customer 3
Concentration Risk [Line Items]
Percentage of revenue by customer				10.40%