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Summary of Restricted Stock Activity (Detail) (Restricted Stock, USD $)
6 Months Ended
Jun. 30, 2013
Restricted Stock
 
Number of Shares/Units  
Outstanding at January 1, 2013 1,534,163
Granted 195,459
Vested (423,215)
Forfeited (11,381)
Outstanding at June 30, 2013 1,295,026
Unvested restricted stock at June 30, 2013 1,295,026
Weighted Average Grant Price  
Weighted Average Grant Date Fair Value Outstanding, Beginning $ 18.85
Weighted Average Grant Date Fair Value, Granted $ 29.39
Weighted Average Grant Date Fair Value, Vested $ 14.87
Weighted Average Grant Date Fair Value, Forfeited $ 22.30
Weighted Average Grant Date Fair Value Outstanding, Ending $ 21.71
Weighted Average Grant Date Fair Value, Unvested restricted stock at June 30, 2013 $ 21.71