Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 24,146	$ (10,322)	$ 11,873	$ 15,887	$ 2,751	$ 8,414	$ 25,697	$ 27,052
Basic weighted average shares of Common Stock outstanding	32,623,532			32,838,636			32,631,423	33,282,584
Dilutive effect of stock options, restricted stock awards and restricted stock units	334,907			94,043			292,590	135,971
Diluted weighted average shares of Common Stock outstanding	32,958,439			32,932,679			32,924,013	33,418,555
Basic earnings per share	$ 0.74			$ 0.48			$ 0.79	$ 0.81
Diluted earnings per share	$ 0.73			$ 0.48			$ 0.78	$ 0.81
Anti-dilutive securities share impact	12,000			441,435			179,500	441,435