|
Property, Plant and Equipment - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2014
|
Sep. 30, 2013
|
Sep. 30, 2014
|
Sep. 30, 2013
|
|
| Property, Plant and Equipment [Line Items] | ||||
| Interest cost paid | $ 0.3 | $ 0.2 | $ 0.9 | $ 0.6 |
| Interest cost capitalized | 0 | 0.4 | ||
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Maximum [Member]
|
||||
| Property, Plant and Equipment [Line Items] | ||||
| Interest cost capitalized | 0.1 | 0.1 | ||
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Property, Plant and Equipment [Member]
|
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| Property, Plant and Equipment [Line Items] | ||||
| Depreciation | $ 1.4 | $ 1.0 | $ 4.0 | $ 2.8 |