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Summary of Costs and Ranges of Useful Lives of the Major Classes of Property, Plant and Equipment and Total Accumulated Depreciation related to Property, Plant and Equipment, Net (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 537,951 $ 536,615
Less accumulated depreciation (425,105) (410,783)
Property, plant and equipment, net 112,846 125,832
Land, at cost
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 7,183 7,185
Buildings, at cost
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 38,118 37,961
Machinery and equipment, at cost
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 223,440 228,605
Office furniture and equipment, at cost
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 240,231 233,948
Leasehold improvements, at cost
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 28,979 $ 28,916
Minimum [Member] | Buildings, at cost
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Useful life 10 years 10 years
Minimum [Member] | Machinery and equipment, at cost
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Useful life 3 years 3 years
Minimum [Member] | Office furniture and equipment, at cost
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Useful life 3 years 3 years
Minimum [Member] | Leasehold improvements, at cost
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Useful life 5 years 5 years
Maximum [Member] | Buildings, at cost
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Useful life 30 years 30 years
Maximum [Member] | Machinery and equipment, at cost
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Useful life 20 years 20 years
Maximum [Member] | Office furniture and equipment, at cost
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Useful life 10 years 10 years
Maximum [Member] | Leasehold improvements, at cost
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Useful life 10 years 10 years