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Summary of Restricted Stock Activity (Detail)
6 Months Ended
Jun. 30, 2016
$ / shares
shares
Shares  
Non-vested at beginning of period | shares 15,916
Granted | shares 150,660
Forfeited | shares (5,394)
Vested | shares (13,247)
Unearned performance-based awards | shares (677)
Non-vested at end of period | shares 147,258
Weighted-Average Grant Date Fair Value  
Non-vested at beginning of period | $ / shares $ 43.47
Granted | $ / shares 33.14
Forfeited | $ / shares 33.05
Vested | $ / shares 42.79
Unearned performance-based awards | $ / shares 53.03
Non-vested at end of period | $ / shares $ 33.33