Basic and Diluted Weighted Average Shares Outstanding (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Weighted Average Number of Shares Outstanding [Line Items]
Weighted average common shares	32,677,003	31,858,103	32,292,588	31,583,063
Dilutive common stock options	650,374	693,483	807,011	699,639
Weighted average common shares, assuming dilution	33,327,377	32,551,586	33,099,599	32,282,702