Property, Plant and Equipment - Schedule of Property,Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
|
Dec. 31, 2012
|
---|---|---|
Property, Plant and Equipment [Line Items] | ||
Cost | $ 141,519 | $ 130,460 |
Accumulated depreciation | (86,913) | (76,625) |
Total | 54,606 | 53,835 |
Buildings [Member]
|
||
Property, Plant and Equipment [Line Items] | ||
Cost | 4,075 | 3,911 |
Plant equipment and instrumentation [Member]
|
||
Property, Plant and Equipment [Line Items] | ||
Cost | 131,572 | 120,982 |
Furniture and fixtures [Member]
|
||
Property, Plant and Equipment [Line Items] | ||
Cost | $ 5,872 | $ 5,567 |