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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