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Employee Compensation Plans - Schedule of Stock Option Activity (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options outstanding, Number of shares, beginning of year 164,193 284,976
Options granted, Number of shares 1,590 37,333
Options exercised, Number of shares   (13,532)
Options forfeited or expired, Number of shares (78,980) (144,584)
Options outstanding, Number of shares, end of year 86,803 164,193
Options vested, Number of shares, end of year 36,023 87,279
Weighted average fair value of options granted during the year, Number of shares $ 7.67 $ 10.89
Options outstanding, Weighted average exercise price, beginning of year $ 29.04 $ 34.39
Options granted, Weighted average exercise price $ 19.31 $ 26.18
Options exercised, Weighted average exercise price   $ 24.88
Options forfeited or expired, Weighted average exercise price $ 35.09 $ 39.24
Options outstanding, Weighted average exercise price, end of year $ 23.35 $ 29.04
Options vested, Weighted average exercise price, end of year $ 22.59 $ 32.86