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Share Based Compensation Plans - Summary of Outstanding Stock Options (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Outstanding at beginning of year, Shares 242,633
Forfeited, Shares (4,100)
Expired, Shares (32,470)
Options outstanding and exercisable, at year end, Shares 206,063
Outstanding at beginning of year, Weighted Average Exercise Price $ 30.94
Forfeited, Weighted Average Exercise Price $ 21.53
Expired, Weighted Average Exercise Price $ 24.19
Options outstanding and exercisable, at year end, Weighted Average Exercise Price $ 32.20