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Employee Stock-Based Compensation (Textual 1 - Employee Stock-Based Compensation) - Additional Information (Detail)
Sep. 30, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of equity incentive plans 2  
2004 Plan
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding options granted 652,810 670,744
2006 Plan
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding options granted 5,192,221 5,533,618
Common stock reserved for issuance 10,329,472  
2006 Plan | Outstanding options and RSUs granted (RSUs)
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares subject to outstanding options and RSUs 5,854,567  
Shares available for future grant 2,381,075