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Property, Plant and Equipment - Schedule of Property,Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property Plant And Equipment [Line Items]    
Cost $ 149,572us-gaap_PropertyPlantAndEquipmentGross $ 143,374us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation (101,023)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (89,002)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total 48,549us-gaap_PropertyPlantAndEquipmentNet 54,372us-gaap_PropertyPlantAndEquipmentNet
Buildings [Member]    
Property Plant And Equipment [Line Items]    
Cost 3,683us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		 4,075us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Plant equipment and instrumentation [Member]    
Property Plant And Equipment [Line Items]    
Cost 140,110us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentMember		 133,427us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentMember
Furniture and fixtures [Member]    
Property Plant And Equipment [Line Items]    
Cost $ 5,779us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember		 $ 5,872us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember