Redemption Prices (Expressed as Percentages of the Principal Amount Thereof) (Detail) (6 5/8% Senior Notes due 2021)	Jun. 30, 2011
2016
Debt Instrument [Line Items]
Debt Instrument Redemption Price	103.313%
2017
Debt Instrument [Line Items]
Debt Instrument Redemption Price	102.208%
2018
Debt Instrument [Line Items]
Debt Instrument Redemption Price	101.104%
2019 and Thereafter
Debt Instrument [Line Items]
Debt Instrument Redemption Price	100.00%