Selected Segment Financial Data, Revenues and Income (Loss) Before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 161,997	$ 137,625
Income (loss) before income taxes	(4,610)	(2,377)
Americas
Segment Reporting Information [Line Items]
Revenues	94,313	74,181
Income (loss) before income taxes	12,967	22,635
EMEA
Segment Reporting Information [Line Items]
Revenues	47,571	44,792
Income (loss) before income taxes	15,055	11,462
Asia /Pacific
Segment Reporting Information [Line Items]
Revenues	20,113	18,652
Income (loss) before income taxes	5,840	4,232
Corporate
Segment Reporting Information [Line Items]
Income (loss) before income taxes	$ (38,472)	$ (40,706)