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Summary of Debt (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2012
Receivables Credit Facility
Dec. 31, 2011
Receivables Credit Facility
Sep. 30, 2012
Senior Credit Facility
Dec. 31, 2011
Senior Credit Facility
Sep. 30, 2012
5.75% Senior Notes
Dec. 31, 2011
5.75% Senior Notes
Sep. 30, 2012
6.50% Senior Notes
Dec. 31, 2011
6.50% Senior Notes
Jun. 30, 2012
3.90% Senior Notes
Sep. 30, 2012
3.90% Senior Notes
Jun. 26, 2012
3.90% Senior Notes
Debt Instrument [Line Items]                      
Credit facility, effective interest rate 1.06% 1.15% 1.72% 2.08%              
Credit facility, due date Oct. 11, 2014 Oct. 11, 2014 Oct. 11, 2016 Oct. 11, 2016              
Senior notes, discount           $ 514 $ 34 $ 38   $ 346  
Senior notes, stated interest percentage           5.75% 6.50% 6.50%   3.90% 3.90%
Senior notes, due date         Aug. 01, 2013   Mar. 15, 2018 Mar. 15, 2018 Jun. 15, 2022 Jun. 15, 2022