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Divestiture-related activities - asset held for sale (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
building
Dec. 31, 2013
Divestiture-Related Activities [Abstract]    
Number of buildings 2us-gaap_NumberOfRealEstateProperties  
Property, plant and equipment $ 7,422us-gaap_AssetsHeldForSalePropertyPlantAndEquipment $ 10,428us-gaap_AssetsHeldForSalePropertyPlantAndEquipment
Total assets held for sale $ 7,422us-gaap_AssetsHeldForSaleCurrent $ 10,428us-gaap_AssetsHeldForSaleCurrent