Earnings (Loss) Per Share (Calculation of Basic and Diluted Earnings Per Share) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ (10,448)	$ (4,563)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	(79)
Net Income (Loss) Attributable to Parent	$ (10,448)	$ (4,642)
Shares used to compute basic net income (loss) per share	38,502,000	38,229,000
Weighted Average Number Diluted Shares Outstanding Adjustment	0	0
Shares used to compute diluted net income (loss) per share	38,502,000	38,229,000
Continuing operations, basic (USD per share)	$ (0.27)	$ (0.12)
Discontinued operations, basic (USD per share)	0	0
Basic net income (loss) per share (USD per share)	(0.27)	(0.12)
Continuing operations, diluted (USD per share)	(0.27)	(0.12)
Discontinued operations, diluted (USD per share)	0	0
Diluted net income (loss) per share (USD per share)	$ (0.27)	$ (0.12)