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Selected Segment Financial Data, Revenues and Operating Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Reporting Information [Line Items]        
Revenues $ 149,797 $ 113,366 $ 287,422 $ 217,909
Operating income (loss) (7,858) 10,422 (9,471) 17,920
Americas
        
Segment Reporting Information [Line Items]        
Revenues 81,727 57,974 155,908 110,304
Operating income (loss) 9,928 15,920 30,091 27,436
EMEA
        
Segment Reporting Information [Line Items]        
Revenues 49,616 41,880 94,408 84,021
Operating income (loss) 12,446 9,835 24,450 21,287
Asia /Pacific
        
Segment Reporting Information [Line Items]        
Revenues 18,454 13,512 37,106 23,584
Operating income (loss) 3,798 1,105 8,024 522
Corporate
        
Segment Reporting Information [Line Items]        
Operating income (loss) $ (34,030) $ (16,438) $ (72,036) $ (31,325)