Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ 13,572	$ 10,569	$ (28,701)	$ 13,919
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(25)	(97)	(60)	(143)
Net income	$ 13,547	$ 10,472	$ (28,761)	$ 13,776
Weighted average common shares outstanding – basic	21,869	21,997	21,848	21,933
Weighted average common stock equivalents	247	403	0	423
Weighted average common shares outstanding – diluted	22,116	22,400	21,848	22,356
Net earnings (loss) per basic share:
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.62	$ 0.48	$ (1.31)	$ 0.63
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0	0	(0.01)	0
Basic (USD per share)	0.62	0.48	(1.32)	0.63
Net earnings per diluted share:
Income (Loss) from Continuing Operations, Per Diluted Share	0.61	0.47	(1.31)	0.62
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0	0	(0.01)	0
Diluted (USD per share)	$ 0.61	$ 0.47	$ (1.32)	$ 0.62