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Selected Segment Financial Data, Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Long-lived assets | $ 309,312 | $ 278,577
Assets | 664,642 | 601,529
Americas - United States |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | 225,094 | 189,389
Assets | 408,038 | 335,457
Americas - Other |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | 4,051 | 4,547
Assets | 26,664 | 21,254
EMEA |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | 56,542 | 59,494
Assets | 166,997 | 186,209
Asia /Pacific |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | 23,625 | 25,147
Assets | $ 62,943 | $ 58,609

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