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Discontinued Operations - Additional Information (Detail) - USD ($)	3 Months Ended							12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Discontinued Operations And Disposal Groups [Abstract]
Sales from discontinued operations								$ 0	$ 0	$ 0
Net (loss) income from discontinued operations	$ (900,000)	$ 100,000	$ (100,000)	$ (1,300,000)	$ (100,000)	$ 4,500,000	$ (100,000)	(900,000)	$ 3,000,000	$ (3,400,000)
Change in estimates for remediation								$ 1,500,000

Amount after tax of income (loss) from a discontinued operation attributable to the parent. 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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