Earnings per Share - Number of Shares Outstanding for Calculation of Earnings Per Share (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator (for basic and diluted earnings (loss) per share)
Net income	$ 3,258	$ 5,515	$ 6,670	$ 7,379
Denominator
Basic weighted-average shares outstanding	35,275,729	34,923,587	35,215,553	34,879,811
Common stock equivalents arising from stock options and restricted stock awards	134,000	659,000	187,000	592,000
Diluted weighted-average shares outstanding	35,410,182	35,582,727	35,402,524	35,471,628