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Employee Stock-Based Compensation (Textual 3 RSU) - Additional Information (Detail) (USD $)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period of RSU awards in equal installments 4 years  
Unrecognized compensation expenses, weighted average period 2 years  
Fair value of common stock vested $ 1,400,000  
Common shares received in payment of payroll taxes (shares) 32,386  
Tax obligations paid in connection with settlement of restricted stock units 436,000 196,000
Restricted Stock
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expenses related to unvested RSUs $ 4,800,000  
2006 Plan
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of common stock vested, shares 209,562