Long Term Debt (Parenthetical) (Detail)	Sep. 30, 2012	Dec. 31, 2011
7.625% Senior Notes Due 2013
Debt Instrument [Line Items]
Debt instrument maturity period	2013
Interest rate	7.625%
9.5% Senior Notes Due 2015
Debt Instrument [Line Items]
Debt instrument maturity period	2015
Interest rate	9.50%
6.25% Euro-Denominated Senior Notes Due 2017
Debt Instrument [Line Items]
Debt instrument maturity period	2017
Interest rate	6.25%
6.5% Senior Notes Due 2017
Debt Instrument [Line Items]
Debt instrument maturity period	2017
Interest rate	6.50%
6.875% Senior Notes Due 2018
Debt Instrument [Line Items]
Debt instrument maturity period	2018
Interest rate	6.875%
7.25% Senior Notes Due 2018
Debt Instrument [Line Items]
Debt instrument maturity period	2018
Interest rate	7.25%
6.625% Senior Notes Due 2019
Debt Instrument [Line Items]
Debt instrument maturity period	2019
Interest rate	6.625%	6.625%
6.775% Senior Notes Due 2019
Debt Instrument [Line Items]
Debt instrument maturity period	2019
Interest rate	6.775%
6.625% Senior Notes Due 2020
Debt Instrument [Line Items]
Debt instrument maturity period	2020
Interest rate	6.625%
6.875% Senior Notes Due 2020
Debt Instrument [Line Items]
Debt instrument maturity period	2020
Interest rate	6.875%
6.125% Senior Notes Due 2021
Debt Instrument [Line Items]
Debt instrument maturity period	2021
Interest rate	6.125%
2.75% Contingent Convertible Senior Notes Due 2035
Debt Instrument [Line Items]
Debt instrument maturity period	2035
Interest rate	2.75%
2.5% Contingent Convertible Senior Notes Due 2037
Debt Instrument [Line Items]
Debt instrument maturity period	2037
Interest rate	2.50%
2.25% Contingent Convertible Senior Notes Due 2038
Debt Instrument [Line Items]
Debt instrument maturity period	2038	2038
Interest rate	2.25%
Term loans due 2017
Debt Instrument [Line Items]
Debt instrument maturity period	2017