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Net Sales - Summary of Net Sales Disaggregated by Principal Markets (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net sales:
Net sales	$ 73,969	$ 75,495	$ 262,413	$ 291,174
Chemical [Member]
Net sales:
Net sales	73,969	75,495	262,413	291,174
Chemical [Member] | Agricultural Products [Member]
Net sales:
Net sales	31,986	35,494	138,441	154,790
Chemical [Member] | Industrial Acids and Other Chemical Products [Member]
Net sales:
Net sales	32,372	30,552	97,137	105,579
Chemical [Member] | Mining Products [Member]
Net sales:
Net sales	$ 9,611	$ 9,449	$ 26,835	$ 30,805

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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