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Earnings Per Share - Computation 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, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Income from continuing operations	$ 3,461			$ 3,036			$ 10,642	$ 10,320
Income from discontinued operations	251						1,445	19,107
Net income	$ 3,712	$ 2,401	$ 5,974	$ 3,036	$ 2,545	$ 23,846	$ 12,087	$ 29,427
Denominator:
Weighted-average shares outstanding	32,376			32,322			32,369	32,244
Effect of dilutive shares	61			93			47	64
Weighted-average diluted shares	32,437			32,415			32,416	32,308
Net income per share - basic:
Continuing operations	$ 0.11			$ 0.09			$ 0.33	$ 0.32
Discontinued operations							0.04	0.59
Net income per share - basic	0.11			0.09			0.37	0.91
Net income per share - diluted:
Continuing operations	0.11			0.09			0.33	0.32
Discontinued operations							0.04	0.59
Net income per share - diluted	$ 0.11			$ 0.09			$ 0.37	$ 0.91

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