Debt - Long-Term Debt and Short-Term Borrowings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Senior Notes, interest at 6.25%, redeemed in 2012 [Member]
Debt Instrument [Line Items]
Interest rate, stated rate	6.25%	6.25%
Senior Notes, interest at 7.875%, redeemed in 2012 [Member]
Debt Instrument [Line Items]
Interest rate, stated rate	7.875%	7.875%
Senior Notes, interest at 7.375%, maturing 2015 [Member]
Debt Instrument [Line Items]
Interest rate, stated rate	7.375%	7.375%
Senior Notes, interest at 6.75%, maturing 2018 [Member]
Debt Instrument [Line Items]
Interest rate, stated rate	6.75%	6.75%
Senior Notes, interest at 7.15%, maturing 2019 [Member]
Debt Instrument [Line Items]
Interest rate, stated rate	7.15%	7.15%
Senior Notes, interest at 3.125%, maturing 2023 [Member]
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 [Member]
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%