Summary of Costs and Ranges of Useful Lives of 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	12 Months Ended
	Dec. 31, 2011 Year	Dec. 31, 2010 Year
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 527,999	$ 520,592
Less accumulated depreciation	(379,094)	(345,025)
Property, plant and equipment, net (Note 1)	148,905	175,567
Buildings, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment, minimum useful lives	10	10
Property, plant and equipment, maximum useful lives	30	30
Property, plant and equipment	37,511	37,657
Machinery and equipment, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment, minimum useful lives	3	3
Property, plant and equipment, maximum useful lives	20	20
Property, plant and equipment	217,764	225,762
Office furniture and equipment, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment, minimum useful lives	3	3
Property, plant and equipment, maximum useful lives	10	10
Property, plant and equipment	236,994	221,804
Leasehold improvements, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment, minimum useful lives	5	5
Property, plant and equipment, maximum useful lives	10	10
Property, plant and equipment	28,563	28,174
Land, at cost
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 7,167	$ 7,195