Annual report pursuant to Section 13 and 15(d)

Summary of Restricted Stock Activity (Detail)

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Summary of Restricted Stock Activity (Detail) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares of Restricted Stock      
Shares of Restricted Stock, Beginning balance 704,353 650,581 606,618
Shares of Restricted Stock, Granted 315,899 328,734 246,534
Shares of Restricted Stock, Vested (209,821) (250,442) (192,230)
Shares of Restricted Stock, Forfeited (26,608) (24,520) (10,341)
Shares of Restricted Stock, Ending balance 783,823 704,353 650,581
Weighted Average Grant Date Fair Value      
Weighted Average Grant Date Fair Value Outstanding, Beginning $ 38.68 $ 35.81 $ 33.51
Weighted Average Grant Date Fair Value, Granted 37.34 38.72 41.70
Weighted Average Grant Date Fair Value, Vested 41.10 31.27 36.26
Weighted Average Grant Date Fair Value, Forfeited 37.69 38.62 33.48
Weighted Average Grant Date Fair Value Outstanding, Ending $ 37.53 $ 38.68 $ 35.81