Schedule of Other Intangible Assets, Net (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 165,406	[1]	$ 165,406	[1]
Accumulated amortization	(127,200)		(122,643)
Total	$ 38,206		$ 42,763

[1] Includes patents, trademarks and other intellectual property, valued at acquisition.