Debt - Long-Term Debt and Short-Term Borrowings (Parenthetical) (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Senior Notes, interest at 7.375%, maturing 2015
Debt Instrument [Line Items]
Interest rate, stated rate	7.375%	7.375%
Senior Notes, interest at 6.75%, maturing 2018
Debt Instrument [Line Items]
Interest rate, stated rate	6.75%	6.75%
Senior Notes, interest at 7.15%, maturing 2019
Debt Instrument [Line Items]
Interest rate, stated rate	7.15%	7.15%
Senior Notes, interest at 3.125%, maturing 2023
Debt Instrument [Line Items]
Interest rate, stated rate	3.125%	3.125%
Mortgages and other, interest rates ranging from 1.00% to 9.00%, various maturities
Debt Instrument [Line Items]
Minimum interest rate, stated percentage on revolving credit facilities	1.00%	1.00%
Maximum interest rate, stated percentage on revolving credit facilities	9.00%	9.00%