Commitments and Contingencies - Involuntary Conversion of Property, Plant and Equipment - Additional Information (Detail) $ in Millions |
1 Months Ended | 12 Months Ended |
|---|---|---|
|
Dec. 31, 2014
USD ($)
|
Dec. 31, 2014
USD ($)
|
|
| Loss Contingencies [Line Items] | ||
| Receivable from insurers | $ 6.5 | $ 6.5 |
| Lake Charles, LA facility [Member] | Insurance Claims [Member] | ||
| Loss Contingencies [Line Items] | ||
| Insurance recoveries | $ 20.8 | |
| Insurance proceeds | 14.3 | |
| Insurance proceeds reflected in cash flows from operating activities | 10.4 | |
| Insurance proceeds reflected in cash flows from investing activities | 3.9 | |
| Cost of Sales [Member] | Lake Charles, LA facility [Member] | Insurance Claims [Member] | ||
| Loss Contingencies [Line Items] | ||
| Insurance recoveries | 17.7 | |
| Insurance recoveries related to business interruption | $ 16.9 |