Selected Segment Financial Data, Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Assets	$ 1,557,316	$ 1,250,886
EMEA
Segment Reporting Information [Line Items]
Assets	372,451	404,016
Asia /Pacific
Segment Reporting Information [Line Items]
Assets	172,745	184,732
Americas - United States
Segment Reporting Information [Line Items]
Assets	982,181	635,558
Americas - Other
Segment Reporting Information [Line Items]
Assets	$ 29,939	$ 26,580