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Stock Compensation Plans - Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Shares outstanding beginning balance 299    
Exercise of stock options, Shares (277)    
Expired, Shares (1)    
Shares outstanding ending balance 21 299  
Shares fully vested, exercisable options 21    
Weighted average exercise price beginning balance $ 2.49    
Weighted average exercise price, Exercised $ 2.48    
Weighted average exercise price, Expired $ 2.53    
Weighted average exercise price ending balance $ 2.55 $ 2.49  
Weighted average exercise price fully vested, exercisable options $ 2.55    
Weighted average remaining term (Years), beginning balance 18 days 1 year  
Weighted average remaining term (Years) fully vested, exercisable options 18 days    
Aggregate intrinsic value beginning balance $ 1,695    
Aggregate intrinsic value, Exercised 1,429 3,146 1,094
Aggregate intrinsic value ending balance 109 1,695  
Aggregate intrinsic value fully vested, exercisable options $ 109