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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019 USD ($) Facility Customer Derivative Segment | Dec. 31, 2018 USD ($) Derivative | Dec. 31, 2017 USD ($)
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 | 9 |  |
Non-cash charge on long-lived assets written down | $ 9,701,000 |  |
Insurance coverage of general liability and auto liability risks | 100,000,000 |  |
Insurance policy covering pollution liability | $ 50,000,000 |  |
Tax benefit recognized | Greater than 50% |  |
Incentive tax credit receivable |  |  | $ 8,100,000
Number of derivatives held with fair value eligible for offset | Derivative | 0 | 0 |
Number of reportable segment | Segment | 1 |  |
Plant, Property and Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Incentive tax credit receivable | $ 2,300,000 | $ 3,100,000 | 7,400,000
Cost of Sales [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Incentive tax credit receivable |  |  | $ 700,000
Non-core [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Long-lived assets, held for sale |  | $ 0 |
Non-core [Member] | Other Expense [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Non-cash charge on long-lived assets written down | $ 9,700,000 |  |
Receivables, Net [Member] | Customer Concentration Risk [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 46.00% |  |
Net Sales [Member] | Customer Concentration Risk [Member] | Koch Fertilizer LLC [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 11.00% | 13.00% | 10.00%
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 |  | 11.00% |
Net Sales [Member] | Customer Concentration Risk [Member] | Covestro [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Concentration risk, percentage |  |  | 12.00%
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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