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Selected Segment Financial Data, Revenues and Operating Income (Loss) (Detail) (USD $) In Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 112,149 | $ 97,017 | $ 330,058 | $ 277,183
Operating income | 11,268 | 7,388 | 29,188 | 10,849
Americas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 59,845 | 49,950 | 170,149 | 146,451
Operating income | 11,764 | 7,594 | 27,405 | 17,482
EMEA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 38,608 | 35,067 | 122,629 | 97,446
Operating income | 2,816 | 3,928 | 13,212 | 4,145
Asia /Pacific |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 13,696 | 12,000 | 37,280 | 33,286
Operating income | $ (3,312) | $ (4,134) | $ (11,429) | $ (10,778)

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