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Discontinued Operations and Divestitures - Loss from Discontinued Operations, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Discontinued Operations And Disposal Groups [Abstract]
Loss from discontinued operations before income tax	$ (330)	$ (219)	$ (1,289)	$ (707)
Income tax benefit	(124)	(86)	(513)	(286)
Loss from discontinued operations, net of tax	$ (206)	$ (133)	$ (776)	$ (421)

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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