Net Income Per Common Share - Schedule of Basic and Diluted Weighted Average Common Shares (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	19,126	18,759	19,094	18,732
Weighted average common equivalent shares	251	72	238	96
Diluted weighted average common shares outstanding	19,377	18,831	19,332	18,828
Options and restricted stock units excluded from diluted weighted average share calculation as effect would have been anti-dilutive	9	733	6	441