Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ 11,087	$ 13,706	$ (17,614)	$ 27,625
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(29)	(52)	(89)	(195)
Net income	$ 11,058	$ 13,654	$ (17,703)	$ 27,430
Weighted average common shares outstanding – basic	21,905	22,052	21,868	21,973
Weighted average common stock equivalents	270	509	0	452
Weighted average common shares outstanding – diluted	22,175	22,561	21,868	22,425
Net earnings (loss) per basic share:
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.50	$ 0.62	$ (0.81)	$ 1.26
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0	0	0	(0.01)
Basic (USD per share)	0.50	0.62	(0.81)	1.25
Net earnings per diluted share:
Income (Loss) from Continuing Operations, Per Diluted Share	0.50	0.61	(0.81)	1.23
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0	0	0	(0.01)
Diluted (USD per share)	$ 0.50	$ 0.61	$ (0.81)	$ 1.22