Annual report pursuant to Section 13 and 15(d)

Stock Option Plans (Summary Stock Option Information) (Detail)

v2.4.0.8
Stock Option Plans (Summary Stock Option Information) (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary Stock Option Information [Line Items]      
Total Options Outstanding, Shares 214,518 192,729 267,856
Total Options Outstanding Weighted average remaining life (yrs) 6 years 1 month 6 days    
Total Options Outstanding, Weighted average exercise price $ 9.72 $ 10.68 $ 8.87
Exercisable Options Outstanding Shares 200,387    
Exercisable Options Outstanding Weighted average remaining life (yrs) 5 years 7 months 6 days    
Exercisable Options Outstanding, Weighted average exercise price $ 9.71    
Unvested Options Outstanding, Shares 14,131    
Unvested Options Outstanding Weighted average remaining life (yrs) 6 years 7 months 6 days    
Unvested Options Outstanding, Weighted average exercise price $ 9.91    
Range of exercise price $1.71 to $2.00
     
Summary Stock Option Information [Line Items]      
Exercise Price Range, Lower Range Limit $ 1.70    
Exercise Price Range, Upper Range Limit $ 2.00    
Total Options Outstanding, Shares 57,723    
Total Options Outstanding Weighted average remaining life (yrs) 7 years 7 months 6 days    
Total Options Outstanding, Weighted average exercise price $ 1.94    
Exercisable Options Outstanding Shares 57,723    
Exercisable Options Outstanding Weighted average remaining life (yrs) 7 years 7 months 6 days    
Exercisable Options Outstanding, Weighted average exercise price $ 1.93    
Unvested Options Outstanding, Shares 0    
Unvested Options Outstanding Weighted average remaining life (yrs) 0 years    
Unvested Options Outstanding, Weighted average exercise price $ 0    
Range of exercise price $7.50 to $11.25
     
Summary Stock Option Information [Line Items]      
Exercise Price Range, Lower Range Limit $ 7.50    
Exercise Price Range, Upper Range Limit $ 11.25    
Total Options Outstanding, Shares 102,637    
Total Options Outstanding Weighted average remaining life (yrs) 6 years 7 months 6 days    
Total Options Outstanding, Weighted average exercise price $ 10.67    
Exercisable Options Outstanding Shares 88,506    
Exercisable Options Outstanding Weighted average remaining life (yrs) 5 years 7 months 6 days    
Exercisable Options Outstanding, Weighted average exercise price $ 10.78    
Unvested Options Outstanding, Shares 14,131    
Unvested Options Outstanding Weighted average remaining life (yrs) 6 years 7 months 6 days    
Unvested Options Outstanding, Weighted average exercise price $ 9.91    
Range of exercise price $15.00 to $17.50
     
Summary Stock Option Information [Line Items]      
Exercise Price Range, Lower Range Limit $ 15.00    
Exercise Price Range, Upper Range Limit $ 17.50    
Total Options Outstanding, Shares 54,158    
Total Options Outstanding Weighted average remaining life (yrs) 3 years 7 months 6 days    
Total Options Outstanding, Weighted average exercise price $ 16.23    
Exercisable Options Outstanding Shares 54,158    
Exercisable Options Outstanding Weighted average remaining life (yrs) 3 years 7 months 6 days    
Exercisable Options Outstanding, Weighted average exercise price $ 16.22    
Unvested Options Outstanding, Shares 0    
Unvested Options Outstanding Weighted average remaining life (yrs) 0 years    
Unvested Options Outstanding, Weighted average exercise price $ 0