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Restricted Stock Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Non-vested Shares  
Non-vested at beginning of year 550,206
Granted 440,150
Vested 281,267
Forfeited 5,829
Non-vested at end of year 703,260
Weighted Average Grant Date Fair Value  
Non-vested at beginning of year $ 27.88
Granted $ 25.62
Vested $ 29.16
Forfeited $ 22.67
Non-vested at end of year $ 26.00