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Stockholders' Equity - Stock Option Activities of Stock Option Plans (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Qualified Stock Option Plans [Member]
      
Stockholders Equity [Line Items]      
Shares outstanding at beginning of year 478,915    
Granted, Shares       
Exercised, Shares (43,285)    
Cancelled/surrendered, forfeited or expired, Shares (22,225)    
Shares outstanding at end of year 413,405 478,915  
Shares exercisable at end of year 201,670    
Outstanding at beginning of year, Weighted-Average Exercise Price $ 22.28    
Granted, Weighted-Average Exercise Price       
Exercised, Weighted-Average Exercise Price $ 10.16    
Cancelled/surrendered, forfeited or expired, Weighted-Average Exercise Price $ 32.21    
Outstanding at end of year, Weighted-Average Exercise Price $ 23.01 $ 22.28  
Exercisable at end of year, Weighted-Average Exercise Price $ 18.39    
Weighted-average fair value per option granted during year     $ 16.00
Total intrinsic value of options exercised during the year $ 1,149,000 $ 895,000 $ 3,294,000
Total fair value of options vested during the year 828,000 861,000 208,000
Non-Qualified Stock Option Plans [Member]
      
Stockholders Equity [Line Items]      
Shares outstanding at beginning of year 258,050    
Granted, Shares       
Exercised, Shares (71,825)    
Shares outstanding at end of year 186,225 258,050  
Shares exercisable at end of year 42,625    
Outstanding at beginning of year, Weighted-Average Exercise Price $ 8.50    
Granted, Weighted-Average Exercise Price       
Exercised, Weighted-Average Exercise Price $ 8.00    
Outstanding at end of year, Weighted-Average Exercise Price $ 8.70 $ 8.50  
Exercisable at end of year, Weighted-Average Exercise Price $ 8.96    
Weighted-average fair value per option granted during year     $ 16.25
Total intrinsic value of options exercised during the year 1,821,000 1,574,000 2,110,000
Total fair value of options vested during the year $ 737,000 $ 731,000 $ 730,000
2008 Plan [Member]
      
Stockholders Equity [Line Items]      
Maximum number of securities for issuance 1,000,000    
Number of awards available to be granted 372,130    
Shares outstanding at end of year 402,405    
Shares exercisable at end of year 190,670    
1998 Plan [Member]
      
Stockholders Equity [Line Items]      
Shares outstanding at end of year 11,000    
Shares exercisable at end of year 11,000