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Adoption of ASC 606 - Summary of Net Sales Disaggregated by Principal Markets (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net sales:
Net sales	$ 94,730	$ 79,781	$ 103,199	$ 100,450	$ 88,917	$ 92,390	$ 122,853	$ 123,344	$ 378,160	$ 427,504	$ 374,585
Chemical [Member]
Net sales:
Net sales									378,160	427,504	374,585
Chemical [Member] | Agricultural Products [Member]
Net sales:
Net sales									187,164	184,054	166,180
Chemical [Member] | Industrial Acids and Other Chemical Products [Member]
Net sales:
Net sales									148,598	196,029	155,744
Chemical [Member] | Mining Products [Member]
Net sales:
Net sales									$ 42,398	38,854	43,532
Chemical [Member] | Other Products [Member]
Net sales:
Net sales										$ 8,567	$ 9,129

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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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-Name Accounting Standards Codification
-Topic 606
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