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Goodwill and Other Intangible Assets (Summary of Changes in Goodwill by Reportable Business Segment) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 760,736 $ 601,666
Acquisitions 165,398 162,920
Purchase Price Adjustments 35 (3,902)
Foreign Currency 440 52
Goodwill, Ending Balance 926,609 760,736
North America [Member]
   
Goodwill [Line Items]    
Goodwill, Beginning Balance 276,714 275,929
Acquisitions      
Purchase Price Adjustments    785
Foreign Currency      
Goodwill, Ending Balance 276,714 276,714
International [Member]
   
Goodwill [Line Items]    
Goodwill, Beginning Balance 484,022 325,737
Acquisitions 165,398 162,920
Purchase Price Adjustments 35 (4,687)
Foreign Currency 440 52
Goodwill, Ending Balance $ 649,895 $ 484,022