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Revenue by Geographic Area (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Geographical Information [Line Items]      
Revenues $ 1,342,695 $ 1,246,986 $ 1,097,868
Americas Principally U S
     
Schedule Of Geographical Information [Line Items]      
Revenues 603,605 553,843 479,692
Europe
     
Schedule Of Geographical Information [Line Items]      
Revenues 501,547 488,632 440,620
Asia Middle East And Africa
     
Schedule Of Geographical Information [Line Items]      
Revenues $ 237,543 $ 204,511 $ 177,556