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Summary of Restricted Stock Activity (Detail) (Restricted Stock, USD $)
9 Months Ended
Sep. 30, 2013
Restricted Stock
 
Shares of Restricted Stock  
Shares of Restricted Stock, Beginning balance 1,534,163
Shares of Restricted Stock, Granted 220,526
Shares of Restricted Stock, Vested (461,060)
Shares of Restricted Stock, Forfeited (21,847)
Shares of Restricted Stock, Ending balance 1,271,782
Shares of Restricted Stock, Unvested restricted stock 1,271,782
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value Outstanding, Beginning $ 18.85
Weighted Average Grant Date Fair Value, Granted $ 29.28
Weighted Average Grant Date Fair Value, Vested $ 15.50
Weighted Average Grant Date Fair Value, Forfeited $ 22.85
Weighted Average Grant Date Fair Value Outstanding, Ending $ 21.81
Weighted Average Grant Date Fair Value, Unvested restricted stock $ 21.81