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Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Option shares      
Options Outstanding at beginning of period 471,880    
Granted       
Exercised 5,850 5,223 2,969
Canceled 91,201    
Options Outstanding at end of period 374,829 471,880  
Options Exercisable at end of period 301,369    
Weighted average exercise price per share      
Options Outstanding at beginning of period $ 20.87    
Granted       
Exercised $ 13.01    
Canceled $ 22.98    
Options Outstanding at end of period $ 20.48 $ 20.87  
Options Exercisable at end of period $ 22.53    
Weighted average remaining contractual term (years)      
Options Outstanding at end of period 5 years 4 months 24 days    
Options Exercisable at end of period 4 years 9 months 18 days    
Aggregate Intrinsic Value      
Options Outstanding at end of period $ 529    
Options Exercisable at end of period $ 191