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, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment	536,616	527,999
Less accumulated depreciation	(398,546)	(379,094)
Property, plant and equipment, net	138,070	148,905
Land, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	7,176	7,167
Buildings, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	37,742	37,511
Machinery and equipment, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	226,823	217,764
Office furniture and equipment, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	235,591	236,994
Leasehold improvements, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	29,284	28,563
Minimum [Member] | Buildings, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Minimum useful lives	10 years	10 years
Minimum [Member] | Machinery and equipment, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Minimum useful lives	3 years	3 years
Minimum [Member] | Office furniture and equipment, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Minimum useful lives	3 years	3 years
Minimum [Member] | Leasehold improvements, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Minimum useful lives	5 years	5 years
Maximum [Member] | Buildings, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Minimum useful lives	30 years	30 years
Maximum [Member] | Machinery and equipment, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Minimum useful lives	20 years	20 years
Maximum [Member] | Office furniture and equipment, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Minimum useful lives	10 years	10 years
Maximum [Member] | Leasehold improvements, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Minimum useful lives	10 years	10 years