FAIR VALUE MEASUREMENT - Additional Information (Detail) - 3.50% Convertible Senior Notes Due 2019	Sep. 30, 2015	Dec. 31, 2014	Oct. 22, 2014	Sep. 30, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	3.50%	3.50%	3.50%
Convertible Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	3.50%		3.50%	3.50%