Basic and Diluted Weighted Average Shares Outstanding (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Weighted Average Number of Shares Outstanding [Line Items]
Weighted average common shares	32,233,694	31,643,695	32,098,269	31,443,264
Dilutive common stock options	842,690	673,461	865,285	672,255
Weighted average common shares, assuming dilution	33,076,384	32,317,156	32,963,554	32,115,519