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Discontinued Operations and Divestitures - Loss from Discontinued Operations, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]
Revenue									$ 6,248	$ 14,589	$ 106,869
(Loss) Income from operations of discontinued operations before income tax expense									(3,518)	(925)	4,602
Income tax (benefit) expense									(1,195)	(171)	2,454
(Loss) income from operations of discontinued operations, net of tax	$ (1,097)	$ (561)	$ (330)	$ (335)	$ 60	$ (239)	$ (312)	$ (263)	$ (2,323)	$ (754)	$ 2,148

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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