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Restructuring Costs - Additional Information (Detail) - Chemicals - Employee Severance $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Sep. 30, 2015 Employee | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |
Workforce reduction, number of individuals | Employee |  | 160 |  |
Restructuring charges | $ 21.1 |  | $ 21.5 |
Accrued severance costs, expected date to be paid |  |  | Jun. 30, 2018 |
Scenario Forecast |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Future workforce reduction costs to be incurred |  |  |  | $ 0.1
Cost of sales |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | $ 10.7 |
Selling, general and administrative Expense |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | $ 10.8 |

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