Selected Segment Financial Data, Revenues and Income (Loss) Before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Revenues	$ 205,830	$ 149,797	$ 367,827	$ 287,422
Income (loss) before income taxes	4,161	(10,846)	(449)	(13,223)
Americas | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	138,379	81,727	232,692	155,908
Income (loss) before income taxes	30,325	12,901	43,292	35,536
EMEA | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	46,719	49,616	94,290	94,408
Income (loss) before income taxes	13,153	12,410	28,208	23,872
Asia /Pacific | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	20,732	18,454	40,845	37,106
Income (loss) before income taxes	3,347	3,746	9,187	7,978
Corporate | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income (loss) before income taxes	$ (42,664)	$ (39,903)	$ (81,136)	$ (80,609)