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, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 537,338	$ 527,999
Less accumulated depreciation	(390,649)	(379,094)
Property, plant and equipment, net	146,689	148,905
Land, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	7,186	7,167
Buildings, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	37,793	37,511
Property, plant and equipment, Minimum useful lives	10	10
Property, plant and equipment, Maximum useful lives	30	30
Machinery and equipment, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	225,175	217,764
Property, plant and equipment, Minimum useful lives	3	3
Property, plant and equipment, Maximum useful lives	20	20
Office furniture and equipment, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	238,512	236,994
Property, plant and equipment, Minimum useful lives	3	3
Property, plant and equipment, Maximum useful lives	10	10
Leasehold improvements, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 28,672	$ 28,563
Property, plant and equipment, Minimum useful lives	5	5
Property, plant and equipment, Maximum useful lives	10	10