Basic and Diluted Weighted Average Shares Outstanding (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Weighted Average Number of Shares Outstanding [Line Items]
Weighted average common shares	33,649,296	32,870,473	33,336,989	32,827,536
Dilutive common stock options	525,831	800,223	525,322	754,146
Weighted average common shares, assuming dilution	34,175,127	33,670,696	33,862,311	33,581,682