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Share-Based Compensation Plans - Summary of Status of Company's Stock Options (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Options Outstanding, Beginning Balance 47,000 71,597 145,209
Options Outstanding, granted         
Options Outstanding, exercised or exchanged (7,000) (24,597) (73,612)
Options Outstanding, cancelled         
Options Outstanding, Ending Balance 40,000 47,000 71,597
Options, Weighted Average Exercise Price, Beginning Balance $ 23.19 $ 21.26 $ 17.64
Exercisable and Outstanding, Options 40,000    
Options Granted, Weighted Average Exercise Price         
Options Exercised or Exchanged, Weighted Average Exercise Price $ 10.31 $ 17.58 $ 14.12
Options Cancelled, Weighted Average Exercise Price         
Options, Weighted Average Exercise Price, Ending Balance $ 25.44 $ 23.19 $ 21.26
Exercisable and Outstanding, Weighted Average Exercise Price $ 25.44    
Exercisable and Outstanding, Weighted Average Remaining Contractual Life 4 years 7 months 24 days    
Exercisable and Outstanding, Aggregate Intrinsic Value $ 493