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Summary of Restricted Stock Activity (Detail) (Restricted Stock, USD $)
3 Months Ended
Mar. 31, 2014
Restricted Stock
 
Shares of Restricted Stock  
Shares of Restricted Stock, Beginning balance 1,260,913
Shares of Restricted Stock, Granted 234,813
Shares of Restricted Stock, Vested (586,955)
Shares of Restricted Stock, Forfeited (786)
Shares of Restricted Stock, Ending balance 907,985
Shares of Restricted Stock, Unvested restricted stock 907,985
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value Outstanding, Beginning $ 21.85
Weighted Average Grant Date Fair Value, Granted $ 28.54
Weighted Average Grant Date Fair Value, Vested $ 20.04
Weighted Average Grant Date Fair Value, Forfeited $ 23.36
Weighted Average Grant Date Fair Value Outstanding, Ending $ 24.75
Weighted Average Grant Date Fair Value, Unvested restricted stock $ 24.75