Stockholders' Equity - Summary of Restricted Stock Activity (Parenthetical) (Detail) - Performance Based Restricted Stock [Member]	12 Months Ended
Dec. 31, 2019
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	50.00%
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%

Maximum target threshold percentage for free cash flow and fixed costs per ton of ammonia.

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- Definition

Percentage increase (decrease) of actual performance based on stockholder return.

+ References

No definition available.

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- Definition

Threshold performance percentage for fixed costs per ton of ammonia.

+ References

No definition available.

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- Definition

Threshold performance percentage for free cash flow.

+ References

No definition available.

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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=116856206&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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