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Employee Compensation Plans - Schedule of Stock Option Activity (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Options outstanding, Number of shares, beginning of year 86,803 164,193
Options granted, Number of shares 951 1,590
Options exercised, Number of shares (12,165)  
Options forfeited or expired, Number of shares (3,016) (78,980)
Options outstanding, Number of shares, end of year 72,573 86,803
Options vested, Number of shares, end of year 45,683 36,023
Weighted average fair value of options granted during the year, Number of shares $ 6.60 $ 7.67
Options outstanding, Weighted average exercise price, beginning of year $ 23.35 $ 29.04
Options granted, Weighted average exercise price $ 17.20 $ 19.31
Options exercised, Weighted average exercise price $ 12.30  
Options forfeited or expired, Weighted average exercise price $ 39.45 $ 35.09
Options outstanding, Weighted average exercise price, end of year $ 24.46 $ 23.35
Options vested, Weighted average exercise price, end of year $ 23.34 $ 22.59