Segments and Geographic Information - Company's Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 324,429	$ 301,244
Percentage of revenues	100.00%	100.00%
Depreciation, net	11,298	10,169
Amortization of intangibles	3,651	3,759
Income (loss) from operations	14,478	9,877
Other income (expense), net	395	(159)
Income taxes	(4,560)	(3,200)
Net income	10,313	6,518
Total assets	936,671	919,601	950,261
Operating Segments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Revenues	261,246	255,214
Percentage of revenues	80.50%	84.70%
Depreciation, net	10,140	9,178
Amortization of intangibles	3,651	3,759
Income (loss) from operations	22,647	19,522
Total assets	1,084,443	1,095,705
Operating Segments [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Revenues	63,183	46,030
Percentage of revenues	19.50%	15.30%
Depreciation, net	1,158	991
Amortization of intangibles
Income (loss) from operations	2,884	1,855
Total assets	1,446,686	709,892
Other [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(11,053)	(11,500)
Other income (expense), net	395	(159)
Income taxes	(4,560)	(3,200)
Total assets	$ (1,594,458)	$ (885,996)