Basic and Diluted Weighted Average Shares Outstanding (Detail)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Weighted Average Number of Shares Outstanding [Line Items]
Weighted average common shares	31,962,843	31,240,606
Dilutive common stock options	868,176	614,822
Weighted average common shares, assuming dilution	32,831,019	31,855,428