|
Property, Plant and Equipment - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
| Property, Plant and Equipment [Abstract] | ||
| Depreciation expense | $ 4.9 | $ 3.5 |