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Net Sales - Summary of Net Sales Disaggregated by Principal Markets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net sales:
Net sales	$ 105,033	$ 121,527	$ 188,444	$ 215,679
Chemical [Member]
Net sales:
Net sales	105,033	121,527	188,444	215,679
Chemical [Member] | Agricultural Products [Member]
Net sales:
Net sales	64,997	72,476	106,455	119,296
Chemical [Member] | Industrial Acids and Other Chemical Products [Member]
Net sales:
Net sales	29,559	37,177	64,765	75,027
Chemical [Member] | Mining Products [Member]
Net sales:
Net sales	$ 10,477	$ 11,874	$ 17,224	$ 21,356

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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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