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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 12 Months Ended
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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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