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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 321,340 $ 314,200
Accumulated depreciation (169,075) (162,912)
Property, plant and equipment, Net 152,265 151,288
Land Improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 5,162 5,122
Buildings [Member]
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 44,260 44,116
Machinery and Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 253,820 250,936
Construction in Progress [Member]
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 9,334 5,315
Other [Member]
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 8,764 $ 8,711