Earnings Per Share - Schedule of Reconciliation of Weighted Average Shares Used in Calculation of Basic and Diluted Earnings Per Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Weighted average common shares-basic	18,769,415	18,445,348	18,750,804	18,322,185
Effect of dilutive securities:
Unexercised stock options net of treasury share repurchase	220,164	175,844		112,943
Weighted average common shares-diluted	18,989,579	18,621,192	18,750,804	18,435,128