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Restricted Stock Activity (Detail) (USD $)
12 Months Ended
Dec. 31, 2011
Non-vested Shares  
Non-vested at beginning of year 333,222
Granted 313,140
Vested (95,806)
Forfeited (350)
Non-vested at end of year 550,206
Weighted Average Grant Date Fair Value  
Non-vested at beginning of year $ 27.98
Granted $ 24.66
Vested $ 17.66
Forfeited $ 29.36
Non-vested at end of year $ 27.88