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Discontinued Operations - Summarized Results of Discontinued Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Discontinued Operations And Disposal Groups [Abstract]
Net sales		$ 138,609
Cost of sales		93,178
Selling, general and administrative expense		32,719
Transaction costs		2,535
Other expense (income), net		175
Income from operations of discontinued operations		10,002
Gain on sale of discontinued operations	$ 2,595	281,990
Provision for income taxes	1,519	91,691
Income from discontinued operations, net of taxes	$ 1,076	$ 200,301

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