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Selected Segment Financial Data, Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]    
Assets $ 1,202,999 $ 664,642
Americas - United States
   
Segment Reporting Information [Line Items]    
Assets 883,030 [1] 408,038 [1]
Americas - Other
   
Segment Reporting Information [Line Items]    
Assets 33,751 26,664
EMEA
   
Segment Reporting Information [Line Items]    
Assets 201,797 166,997
Asia /Pacific
   
Segment Reporting Information [Line Items]    
Assets $ 84,421 $ 62,943
[1] The goodwill related to the S1 acquisition is included in Americas - United States as of June 30, 2012. See Note 5 for further discussion.