Selected Segment Financial Data, Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Revenues	$ 254,808	$ 205,830	$ 476,281	$ 367,827
Income (loss) before income taxes	13,646	4,161	3,904	(449)
Americas | Operating Segments
Segment Reporting Information [Line Items]
Revenues	177,745	138,379	332,514	232,692
Income (loss) before income taxes	26,074	30,325	43,033	43,292
EMEA | Operating Segments
Segment Reporting Information [Line Items]
Revenues	57,350	46,719	104,811	94,290
Income (loss) before income taxes	24,669	13,153	42,340	28,208
Asia/Pacific | Operating Segments
Segment Reporting Information [Line Items]
Revenues	19,713	20,732	38,956	40,845
Income (loss) before income taxes	10,428	3,347	16,082	9,187
Corporate | Corporate, Non-Segment
Segment Reporting Information [Line Items]
Income (loss) before income taxes	$ (47,525)	$ (42,664)	$ (97,551)	$ (81,136)