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Discontinued Operations and Assets Held For Sale - Schedule of Activity From Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Discontinued Operations And Disposal Groups [Abstract]
Impairments	$ (329)		$ (718)	$ (269)
Changes in environmental estimates	46	$ 551	305	2,804
Other operating income		4		7
Earnings (loss) from discontinued operations	$ (283)	$ 555	$ (413)	$ 2,542

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. 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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