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Schedule of Share Based Compensation Stock Options Activity (Detail) - Stock Option
9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares, Outstanding Beginning Balance | shares 67,375
Shares, Granted | shares 66,000
Shares, Exercised | shares (1,666)
Shares, Forfeited | shares (33,336)
Shares, Outstanding Ending Balance | shares 98,373
Shares, Exerciseable | shares 34,615
Weighted-Average Exercise Price, Outstanding Beginning Balance $ 26.05
Weighted-Average Exercise Price, Granted 30.99
Weighted-Average Exercise Price, Exercised 26.52
Weighted-Average Exercise Price, Forfeited 29.54
Weighted-Average Exercise Price, Oustanding Ending Balance 28.17
Weighted-Average Exercise Price, Exerciseable $ 26.27
Weighted-Average Remaining Contractual Life (Yrs), Outstanding 8 years 9 months 11 days
Weighted-Average Remaining Contractual Life (Yrs), Exerciseable 8 years 2 months 1 day
Aggregate Intrinsic Value, Outstanding | $ $ 49,447
Aggregate Intrinsic Value, Exerciseable | $ $ 32,007