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Summary of Restricted Stock Activity (Detail) - Restricted Stock
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Shares of Restricted Stock  
Shares of Restricted Stock, Beginning balance | shares 704,353
Shares of Restricted Stock, Granted | shares 247,342
Shares of Restricted Stock, Vested | shares (149,976)
Shares of Restricted Stock, Forfeited | shares (8,808)
Shares of Restricted Stock, Ending balance | shares 792,911
Shares of Restricted Stock, Unvested restricted stock | shares 792,911
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value Outstanding, Beginning | $ / shares $ 38.68
Weighted Average Grant Date Fair Value, Granted | $ / shares 36.77
Weighted Average Grant Date Fair Value, Vested | $ / shares 42.69
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 37.03
Weighted Average Grant Date Fair Value Outstanding, Ending | $ / shares 37.35
Weighted Average Grant Date Fair Value, Unvested restricted stock | $ / shares $ 37.35