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Equity Incentive Plans (Textual 3 RSU) - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period of RSU awards in equal installments 4 years  
Fair value of common stock vested $ 1,300,000  
Common shares received in payment of payroll taxes (shares) 49,520  
Tax obligations paid in connection with settlement of restricted stock units 196,000  
2006 Plan
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of common stock vested, shares 201,186 2,500
Service Restricted Stock Units
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation costs related to unvested awards, weighted average period 2 years 2 months 12 days  
Unrecognized compensation expenses related to unvested RSUs $ 5,400,000