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	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment	532,349	536,615
Less accumulated depreciation	(418,747)	(410,783)
Property, plant and equipment, net	113,602	125,832
Land, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	7,195	7,185
Buildings, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	38,036	37,961
Machinery and equipment, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	222,896	228,605
Office furniture and equipment, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	235,312	233,948
Leasehold improvements, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	28,910	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