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STOCK BASED COMPENSATION - Expense Resulting from Stock Option Awards and ESPP (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 5,487us-gaap_ShareBasedCompensation $ 4,672us-gaap_ShareBasedCompensation
Stock Options [Member] | Cost of revenues    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 23us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 7us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Stock Options [Member] | Selling, general and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 4,729us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 4,041us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
Restricted Stock Units (RSUs) [Member] | Selling, general and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 346us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 315us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
ESPP shares [Member] | Selling, general and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 389us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 $ 309us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember