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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 USD ($) Facility Customer Derivative Segment | Dec. 31, 2017 USD ($) Derivative | Dec. 31, 2016 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 | 6 |  |
Percentage of net receivables | 39.00% |  |
Inventory reserves | $ 278,000 | $ 933,000 |
Long-lived assets, held for sale | 0 | 0 |
Impairments of goodwill |  |  | $ 1,621,000
Interest cost capitalized | 0 | 300,000 | $ 15,000,000
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 |  |
Increase operating lease, right-of-use asset | $ 15,000,000 |  |
Increase operating lease, obligation liability | 15,000,000 |  |
Cost of Sales [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Incentive tax credit receivable |  | $ 700,000 |
Plant, Property and Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Incentive tax credit receivable | $ 3,100,000 | $ 7,400,000 |
Customer [Member] | Net Sales [Member] | Covestro [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of total net sales |  | 12.00% | 13.00%
Customer [Member] | Net Sales [Member] | Coffeyville Resources Nitrogen Fertilizers L.L.C. [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of total net sales | 11.00% |  |
Customer [Member] | Net Sales [Member] | Koch Fertilizer LLC [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of total net sales | 13.00% | 10.00% | 11.00%

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