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Discontinued Operations and Divestitures - Loss from Discontinued Operations, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Discontinued Operations And Disposal Groups [Abstract]
Revenue		$ 2,579		$ 5,994
Loss from discontinued operations before income tax	$ (437)	(489)	$ (488)	(993)
Income tax benefit	(179)	(159)	(200)	(328)
Loss from discontinued operations, net of tax	$ (258)	$ (330)	$ (288)	$ (665)

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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