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Commitments and Contingencies - Additional Information (Detail) MMBTU in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 01, 2015 USD ($) | Jan. 31, 2016 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2014 Violation | Dec. 31, 2015 USD ($) MMBTU Settlement T $ / MMBTU | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2002 Subsidiary | Dec. 31, 2012 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Expenses incurred in operating lease agreements |  |  |  |  | $ 9,845,000 | $ 7,002,000 | $ 5,898,000 |  |
Working interest in natural gas properties |  |  |  |  | 12.00% |  |  |  |
Natural gas purchase commitments | MMBTU |  |  |  |  | 5.1 |  |  |  |
Month purchase commitment period ends natural gas |  |  |  |  | 2016-12 |  |  |  |
Natural gas purchase commitments weighted average cost, per unit | $ / MMBTU |  |  |  |  | 2.91 |  |  |  |
Natural gas purchase commitments weighted average cost, amount |  |  |  |  | $ 14,900,000 |  |  |  |
Natural gas purchase commitments weighted average market value per unit | $ / MMBTU |  |  |  |  | 2.47 |  |  |  |
Natural gas purchase commitments weighted average market value, amount |  |  |  |  | $ 12,700,000 |  |  |  |
Outstanding letters of credit |  |  |  |  | 2,800,000 |  |  |  |
Customer advances and deposits |  |  |  |  | 2,100,000 |  |  |  |
Estimated share of the annual operating costs of pipeline, minimum |  |  |  |  | 100,000 |  |  |  |
Estimated share of the annual operating costs of pipeline, maximum |  |  |  |  | $ 150,000 |  |  |  |
Operating agreement |  |  |  |  | The initial term of the operating agreement is through December 2053. |  |  |  |
Indemnify the sureties for payments |  |  |  |  | $ 12,400,000 |  |  |  |
Payments under employment and severance agreements |  |  |  |  | 8,900,000 |  |  |  |
Accrued liabilities for environmental matters |  |  |  |  | 439,000 |  |  |  |
Penalty related to discharge water permit |  |  |  |  |  |  |  |  | $ 100,000
Estimated litigation liability |  |  |  |  | $ 0 |  |  |  |
Percentage of payment of investigation costs agreed by Hallowell Facility |  |  |  |  | 50.00% |  |  |  |
Insurance coverage of general liability and auto liability risks |  |  |  |  | $ 100,000,000 |  |  |  |
Product liability deductible per claim |  |  |  |  | $ 250,000 |  |  |  |
Confidential settlement agreement with family groups | Settlement |  |  |  |  | 3 |  |  |  |
Liability reserve |  |  |  |  | $ 0 |  |  |  |
Pre-litigation demand amount | $ 18,000,000 |  |  |  |  |  |  |  |
Global Industrial Inc [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Claimed amount payable by Global for certain work |  |  | $ 18,000,000 |  |  |  |  |  |
Estimated amount paid to Global of disputed amount |  |  | 6,000,000 |  |  |  |  |  |
Global Industrial Inc [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Claimed amount payable by Global for certain work |  | $ 3,600,000 |  |  |  |  |  |  |
Adjusted Estimated Claim Amount |  | 5,000,000 |  |  |  |  |  |  |
Liability amount |  | $ 0 |  |  |  |  |  |  |
Orica International [Member] | Ammonium Nitrate Supply Agreement [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Notice of termination |  |  |  |  | Required notice of termination of one year |  |  |  |
Ammonium nitrate supply agreement maturity date |  |  |  |  | Apr. 09, 2015 |  |  |  |
Orica International [Member] | Ammonium Nitrate Supply Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Purchase agreement quantity with Orica International | T |  |  |  |  | 240,000 |  |  |  |
Cherokee Facility [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Accrued liabilities for environmental matters |  |  |  |  | $ 100,000 |  |  |  |
Number of alleged violations | Violation |  |  |  | 11 |  |  |  |  |
Environmental loss contingencies civil penalty |  |  |  |  | $ 26,000 |  |  |  |
Hallowell Facility [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of subsidiaries that sold their operating assets | Subsidiary |  |  |  |  |  |  |  | 2 |
EL Dorado Ammonia L.L.C [Member] | Global Industrial Inc [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Estimated amount paid to Global of disputed amount |  |  | $ 3,500,000 |  |  |  |  |  |
Gathering Agreement [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Agreement description |  |  |  |  | Contractually agreed to deliver a minimum daily quantity of natural gas to a certain gathering and pipeline system through December 2026 to ensure capacity availability on that system. This gathering agreement effectively requires a daily minimum demand charge. |  |  |  |
Agreement term |  |  |  |  | December 2026 |  |  |  |
Pryor Chemical Company [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Required period for notice of termination |  |  |  |  | 3 months |  |  |  |
Koch Nitrogen [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Required period for notice of termination |  |  |  |  | 6 months |  |  |  |
Covestro Agreement [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Operating agreement maturity period |  |  |  |  | 2021-06 |  |  |  |
Ammonia Supply Agreement [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Supply commitment, description |  |  |  |  | the ammonia that (a) will be produced at the El Dorado Facility and (b) that is in excess of El Dorado’s needs. |  |  |  |
Supply commitment, period |  |  |  |  | 3 years |  |  |  |
Notice of termination |  |  |  |  | notice of termination at least nine months prior to the end of term |  |  |  |
Demand Charge [Member] | Gathering Agreement [Member] |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Annual minimum demand charges, Year One |  |  |  |  | $ 1,800,000 |  |  |  |
Annual minimum demand charges, Year Two |  |  |  |  | 1,800,000 |  |  |  |
Annual minimum demand charges, Year Three |  |  |  |  | 1,800,000 |  |  |  |
Annual minimum demand charges, Year Four |  |  |  |  | 1,800,000 |  |  |  |
Annual minimum demand charges, Year Five |  |  |  |  | 1,800,000 |  |  |  |
Annual minimum demand charges, Thereafter |  |  |  |  | 3,900,000 |  |  |  |
Annual minimum demand charges, Total obligation |  |  |  |  | $ 12,900,000 |  |  |  |

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