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Stock Incentive Plans - Summary of Stock Options Activity (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Outstanding beginning balance, Number of options 538,697 671,294 399,569
Options granted, Number of options   7,500 289,200
Options exercised, Number of options (138,298) (131,997) (7,475)
Options cancelled, Number of options   (8,100) (10,000)
Outstanding ending balance, Number of options 400,399 538,697 671,294
Available for grant, Number of options 543,503    
Options granted, Weighted average exercise price   $ 17.55 $ 16.06
Options exercised, Weighted average exercise price $ 13.53 $ 13.98 $ 7.24
Options cancelled , Weighted average exercise price   $ 13.85 $ 14.39