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Restructuring Costs - Additional Information (Detail) - Chemicals - Employee Severance | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Employee | Dec. 31, 2015 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Workforce reduction, number of individuals | Employee |  |  |  | 160 |
Restructuring charges | $ 200,000 | $ 400,000 | $ 21,100,000 |  | $ 21,700,000
Workforce reduction costs to be incurred | $ 0 |  |  | $ 0 | $ 0
Accrued severance costs, expected date to be paid |  |  |  |  | Sep. 30, 2018
Cost of sales |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  |  | $ 10,800,000
Selling, general and administrative Expense |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  |  | $ 10,900,000

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