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Summary of Restricted Stock Activity (Detail) (Restricted Stock, USD $)
3 Months Ended
Mar. 31, 2013
Restricted Stock
 
Number of Shares/Units  
Outstanding at January 1, 2013 1,534,163
Granted 185,821
Vested (408,140)
Outstanding at March 31, 2013 1,311,844
Unvested restricted stock at March 31, 2013 1,311,844
Weighted Average Grant Price  
Weighted Average Grant Date Fair Value, Outstanding, Beginning $ 18.85
Weighted Average Grant Date Fair Value, Granted $ 29.44
Weighted Average Grant Date Fair Value, Vested $ 14.91
Weighted Average Grant Date Fair Value Outstanding, Ending $ 21.58
Weighted Average Grant Date Fair Value, Unvested restricted stock at March 31, 2013 $ 21.58