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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) Facility Customer Segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]
Number of facilities for manufacture and distribution of products | Facility	4
Number of customers accounted as percentage of accounts receivable | Customer	10
Insurance coverage of general liability and auto liability risks	$ 100.0
Insurance policy covering pollution liability	$ 50.0
Tax benefit recognized	Greater than 50%
Incentive tax credit receivable	$ 1.4	$ 2.3
Number of reportable segment | Segment	1
Receivables, Net [Member] | Customer Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	52.00%
Net Sales [Member] | Customer Concentration Risk [Member] | Koch Fertilizer LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	10.00%	11.00%	13.00%
Net Sales [Member] | Customer Concentration Risk [Member] | Coffeyville Resources Nitrogen Fertilizers L.L.C. [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	13.00%	9.00%	11.00%
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Credit sales, payment terms	30 days
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Credit sales, payment terms	60 days

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Insurance policy covering pollution liability.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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