Changes in Carrying Amount of Goodwill by Reporting Unit (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2012 Performance Materials Segment	Jun. 30, 2012 Other Products and Services	Dec. 31, 2011 Other Products and Services
Goodwill [Line Items]
Beginning Balance	$ 18,059	$ 13,399	$ 4,660	$ 4,660
Currency translation adjustments	(104)	(104)
Other adjustments	63	63
Ending Balance	$ 18,018	$ 13,358	$ 4,660	$ 4,660

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details