Goodwill and Intangible Assets, Net (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Carrying amount of goodwill by reportable segment
Goodwill	$ 130,556	$ 99,849	$ 71,338
North America
Carrying amount of goodwill by reportable segment
Goodwill	77,606	73,901	41,871
Europe
Carrying amount of goodwill by reportable segment
Goodwill	50,975	24,000	27,500
Asia/Pacific
Carrying amount of goodwill by reportable segment
Goodwill	$ 1,975	$ 1,948	$ 1,967

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 2: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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Reference 5: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

+ Details