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Stock-Based Compensation Plans - Schedule of Non-Vested Restricted Stock Activity (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Shares Non-vested, Beginning balance 686,778
Shares, Granted 300,900
Shares, Vested (216,376)
Shares, Forfeited (9,600)
Shares Non-vested, Ending balance 761,702
Weighted average grant date fair value Non-vested, Beginning balance $ 31.50
Weighted average grant date fair value, Granted $ 34.64
Weighted average grant date fair value, Vested $ 30.20
Weighted average grant date fair value, Forfeited $ 33.03
Weighted average grant date fair value Non-vested, Ending balance $ 33.09