CERTAIN RISKS AND CONCENTRATION - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Concentration Risk [Line Items]
Number of customers with greater than ten percent revenue			2	2
Number of customers with greater than ten percent of total accounts receivable			2		2
Customer 1
Concentration Risk [Line Items]
Concentration Risk, Percentage	24.80%	34.70%	30.30%	29.40%
Percentage of total accounts receivables			28.20%		48.50%
Customer 2
Concentration Risk [Line Items]
Concentration Risk, Percentage	19.40%	14.70%		12.50%
Percentage of total accounts receivables			22.90%		14.60%