Restructuring and Divestiture Costs - Discontinued Operations - Aromatics - Additional Information (Detail) - Aromatics [Member] - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2015 |
|
| Restructuring Cost and Reserve [Line Items] | ||
| Restructuring and divestiture costs | $ 20.0 | |
| Performance bonus payable | $ 5.0 | 5.0 |
| INEOS Americas LLC. [Member] | ||
| Restructuring Cost and Reserve [Line Items] | ||
| Restructuring and divestiture costs | 10.0 | |
| Decommissioning and dismantlement costs | $ 5.0 |