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Summary of Restricted Stock Activity (Detail) - Restricted Stock
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Shares of Restricted Stock  
Shares of Restricted Stock, Beginning balance | shares 878,897
Shares of Restricted Stock, Granted | shares 226,212
Shares of Restricted Stock, Vested | shares (328,532)
Shares of Restricted Stock, Forfeited | shares (14,158)
Shares of Restricted Stock, Ending balance | shares 762,419
Shares of Restricted Stock, Unvested restricted stock | shares 762,419
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value Outstanding, Beginning $ 24.92
Weighted Average Grant Date Fair Value, Granted 42.79
Weighted Average Grant Date Fair Value, Vested 23.71
Weighted Average Grant Date Fair Value, Forfeited 25.93
Weighted Average Grant Date Fair Value Outstanding, Ending 30.74
Weighted Average Grant Date Fair Value, Unvested restricted stock $ 30.74