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Stockholders' Equity - Summary of Restricted Stock Activity (Parenthetical) (Detail) - Performance Based Restricted Stock [Member] | 12 Months Ended
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Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Restricted stock, vesting period | 3 years
Threshold performance percentage for free cash flow | 70.00%
Threshold performance percentage for fixed costs per ton of ammonia | 60.00%
Maximum target threshold percentage for free cash flow and fixed costs per ton of ammonia | 120.00%
Percentage increase/decrease of actual performance based on total stockholder return | 25.00%

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- Definition Percentage increase (decrease) of actual performance based on stockholder return. + References No definition available. + Details
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- Definition Threshold performance percentage for fixed costs per ton of ammonia. + References No definition available. + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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