Selected Segment Financial Data, Revenues and Operating Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Revenues	$ 137,625	$ 104,543
Operating income (loss)	(1,613)	7,498
Americas
Segment Reporting Information [Line Items]
Revenues	74,181	52,330
Operating income (loss)	20,163	11,516
EMEA
Segment Reporting Information [Line Items]
Revenues	44,792	42,141
Operating income (loss)	12,004	11,452
Asia /Pacific
Segment Reporting Information [Line Items]
Revenues	18,652	10,072
Operating income (loss)	4,226	(582)
Corporate
Segment Reporting Information [Line Items]
Operating income (loss)	$ (38,006)	$ (14,888)