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Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities (Summary Of Supplemental Disclosures Of Cash Flow Information And Non-Cash Financing And Investing Activities) (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Interest $ 12,928 $ 13,379
Income taxes 60,918 51,949
Other payable issued for purchased customer accounts 25,775  
Notes payable issued or assumed for purchased customer accounts 59 1,859
Estimated acquisition earn-out payables and related charges 15,055 15,463
Notes received on the sale of fixed assets and customer accounts $ 1,116 $ 6,710