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Selected Segment Financial Data, Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]    
Assets $ 1,601,495 $ 1,250,886
Americas - United States | Operating Segments
   
Segment Reporting Information [Line Items]    
Assets 1,024,207 635,558
Americas - Other | Operating Segments
   
Segment Reporting Information [Line Items]    
Assets 42,395 26,580
EMEA | Operating Segments
   
Segment Reporting Information [Line Items]    
Assets 390,854 404,016
Asia /Pacific | Operating Segments
   
Segment Reporting Information [Line Items]    
Assets $ 144,039 $ 184,732