Property Plant and Equipment - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
|
Property, Plant and Equipment [Line Items] | |||
Depreciation and amortization expense | $ 0.1 | $ 0.1 | $ 0.1 |